Waste-to-energy is the use of combustion and biological technologies to recover energy from urban wastes. There are three major waste to energy conversion routes – thermochemical, biochemical and physico-chemical. Thermochemical conversion, characterized by higher temperature and conversion rates, is best suited for lower moisture feedstock and is generally less selective for products. On the other hand, biochemical technologies are more suitable for wet wastes which are rich in organic matter.
Thermochemical Conversion of Waste
The three principal methods of thermochemical conversion of waste are combustion in excess air, gasification in reduced air, and pyrolysis in the absence of air. The most common technique for producing both heat and electrical energy from household wastes is direct combustion.
Combined heat and power (CHP) or cogeneration systems, ranging from small-scale technology to large grid-connected facilities, provide significantly higher efficiencies than systems that only generate electricity.
Combustion technology is the controlled combustion of waste with the recovery of heat to produce steam which in turn produces power through steam turbines. Pyrolysis and gasification represent refined thermal treatment methods as alternatives to incineration and are characterized by the transformation of the waste into product gas as energy carrier for later combustion in, for example, a boiler or a gas engine. Plasma gasification, which takes place at extremely high temperature, is also hogging limelight nowadays.
Biochemical Conversion of Waste
Biochemical processes, like anaerobic digestion, can also produce clean energy in the form of biogas which can be converted to power and heat using a gas engine. Anaerobic digestion is the natural biological process which stabilizes organic waste in the absence of air and transforms it into biofertilizer and biogas.
Anaerobic digestion is a reliable technology for the treatment of wet, organic waste. Organic waste from various sources is biochemically degraded in highly controlled, oxygen-free conditions circumstances resulting in the production of biogas which can be used to produce both electricity and heat.
In addition, a variety of fuels can be produced from waste resources including liquid fuels, such as ethanol, methanol, biodiesel, Fischer-Tropsch diesel, and gaseous fuels, such as hydrogen and methane. The resource base for biofuel production is composed of a wide variety of forestry and agricultural resources, industrial processing residues, and municipal solid and urban wood residues. Globally, biofuels are most commonly used to power vehicles, heat homes, and for cooking.
Physico-chemical Conversion of Waste
The physico-chemical conversion of waste involves various processes to improve physical and chemical properties of solid waste. The combustible fraction of the waste is converted into high-energy fuel pellets which may be used in steam generation.
The waste is first dried to bring down the high moisture levels. Sand, grit, and other incombustible matter are then mechanically separated before the waste is compacted and converted into fuel pellets or RDF.
Fuel pellets have several distinct advantages over coal and wood because it is cleaner, free from incombustibles, has lower ash and moisture contents, is of uniform size, cost-effective, and eco-friendly.
China is the world’s largest waste generator, producing as much as 175 million tons of waste every year. With a current population surpassing 1.37 billion and exponential trends in waste output expected to continue, it is estimated that China’s cities will need to develop an additional hundreds of landfills and waste-to-energy plants to tackle the growing waste management crisis.
China’s three primary methods for municipal waste management are landfills, incineration, and composting. Nevertheless, the poor standards and conditions they operate in have made waste management facilities generally inefficient and unsustainable. For example, discharge of leachate into the soil and water bodies is a common feature of landfills in China. Although incineration is considered to be better than landfills and have grown in popularity over the years, high levels of toxic emissions have made MSW incineration plants a cause of concern for public health and environment protection.
Salman Zafar, a renowned waste management, waste-to-energy and bioenergy expert was interviewed to discuss waste opportunities in China. As Mr. Zafar commented on the current problems with these three primary methods of waste management used by most developing countries, he said, “Landfills in developing countries, like China and India, are synonymous with huge waste dumps which are characterized by rotting waste, spontaneous fires, toxic emissions and presence of rag-pickers, birds, animals and insects etc.” Similarly, he commented that as cities are expanding rapidly worldwide, it is becoming increasingly difficult to find land for siting new landfills.
On incineration, Zafar asserted that this type of waste management method has also become a controversial issue due to emission concerns and high technology costs, especially in developing countries. Many developers try to cut down costs by going for less efficient air pollution control systems”. Mr. Zafar’s words are evident in the concerns reflected in much of the data that waste management practices in China are often poorly monitored and fraudulent, for which data on emission controls and environmental protection is often elusive.
Similarly, given that management of MSW involves the collection, transportation, treatment and disposal of waste, Zafar explains why composting has also such a small number relative to landfills for countries like China. He says, “Composting is a difficult proposition for developing countries due to absence of source-segregation. Organic fraction of MSW is usually mixed with all sorts of waste including plastics, metals, healthcare wastes and industrial waste which results in poor quality of compost and a real risk of introduction of heavy metals into agricultural soils.”
Given that China’s recycling sector has not yet developed to match market opportunities, even current treatment of MSW calls for the need of professionalization and institutionalization of the secondary materials industry.
While MSW availability is not an issue associated with the potential of the resource given its dispersion throughout the country and its exponential increase throughout, around 50 percent of the studies analyzed stated concerns for the high moisture content and low caloric value of waste in China, making it unattractive for WTE processes.
Talking about how this issue can be dealt with, Mr. Zafar commented that a plausible option to increase the calorific value of MSW is to mix it with agricultural residues or wood wastes. Thus, the biomass resources identified in most of the studies as having the greatest potential are not only valuable individually but can also be processed together for further benefits.
Among the major challenges on the other hand, were insufficient or elusive data, poor infrastructure, informal waste collection systems and the lack of laws and regulations in China for the industry. Other challenges included market risk, the lack of economic incentives and the high costs associated with biomass technologies. Nevertheless, given that the most recurring challenges cited across the data were related to infrastructure and laws and regulations, it is evident that China’s biomass policy is in extreme need of reform.
China’s unsustainable management of waste and its underutilized potential of MSW feedstock for energy and fuel production need urgent policy reform for the industry to develop. Like Mr. Zafar says, “Sustainable waste management demands an integration of waste reduction, waste reuse, waste recycling, and energy recovery from waste and landfilling. It is essential that China implements an integrated solid waste management strategy to tackle the growing waste crisis”.
China’s government will play a key role in this integrated solid waste management strategy. Besides increased cooperation efforts between the national government and local governments to encourage investments in solid waste management from the private sector and foster domestic recycling practices, first, there is a clear need to establish specialized regulatory agencies (beyond the responsibilities of the State Environmental Protection Administration and the Ministry of Commerce) that can provide clearer operating standards for current WTE facilities (like sanitary landfills and incinerators) as well as improve the supervision of them.
It is essential that China implements an integrated solid waste management strategy to tackle the growing waste crisis
Without clear legal responsibility assigned to specialized agencies, pollutant emissions and regulations related to waste volumes and operating conditions may continue to be disregarded. Similarly, better regulation in MSW management for efficient waste collection and separation is needed to incentivize recycling at the individual level by local residents in every city. Recycling after all is complementary to waste-to-energy, and like Salman Zafar explains, countries with the highest recycling rates also have the best MSW to energy systems (like Germany and Sweden).
Nevertheless, without a market for reused materials, recycling will take longer to become a common practice in China. As Chinese authorities will not be able to stop the waste stream from growing but can reduce the rate of growth, the government’s role in promoting waste management for energy production and recovery is of extreme importance.
Waste dumping is the predominant method for solid waste disposal in developing countries worldwide, and Nigeria is no exception. Nigeria is home to six of the biggest dumpsites in Africa, according to Waste Atlas 2014 report on World’s 50 Biggest Dumpsites published by D-Waste. These dumpsites are located in three most important cities in Nigeria namely, Lagos, Port Harcourt and Ibadan.
Let us have a quick look at the major landfills in Nigeria:
Olusosun is the largest dumpsite not only in Lagos but in Nigeria and receives about 2.1 million tonnes of waste annually comprising mostly of municipal solid waste, construction waste, and electronic waste (e-waste). The dumpsite covers an area of about 43 hectares and it is 18 meters deep.
The dumpsite has been in existence since 1992 and has housed about 24.5 million tonnes of waste since then. A population of about 5 million people lives around 10km radius from the site and numerous health problems like skin irritation, dysentery, water-related diseases, nausea etc. have been reported by residents living around 3km radius from the site.
It is located in Lagos and occupies around 8 hectares of land along Lasu-Iba road. The dumpsite receives about 820,000 tonnes of waste annually and has since its existence in 2006 accepted around 5.8 million tonnes of MSW.
Solous is just 200 meters away from the nearest dwellings and almost 4 million people live within 10km radius from the site. Due to the vulnerable sand formation of the area, leachate produced at the dumpsite flows into groundwater causing its contamination.
Epe dumpsite also in Lagos occupies about 80 hectares of land. The dumpsite was opened in 2010 and has an annual input of 12,000 tonnes of MSW. Epe is the dumpsite which the Lagos State government is planning to upgrade to an engineered landfill and set to replace Olusosun dumpsite after its closure.
Since its existence, it has received about 47,000 tonnes of waste and it is just 500 meters away from the nearest settlement. The dumpsite is also just 2km away from Osogbo River and 7km away from Lekki Lagoon.
The dumpsite is located in Ibadan and has been in existence since 1998 receiving 36,000 tonnes of MSW annually. It covers an area of 14 hectares and already has in place almost 525,000 tonnes of waste.
The dumpsite is close to Eleyele Lake (2.5km away) and IITA Forest Reserve (4.5km away). The nearest settlement to the dumpsite is just 200 meters away and groundwater contamination has been reported by nearby residents.
Lapite dumpsite is also located in Ibadan occupies an area of 20 hectares receiving around 9,000 tonnes of MSW yearly. Since its existence in 1998, it has housed almost 137,000 tonnes of MSW. It is 9km away from IITA Forest Reserve and surrounded by vegetations on both sides of the road since the dumpsite is directly opposite a major road.
Olusosun is the largest dumpsite in Nigeria
The nearest settlement is about 2km away but due to the heavy metals present in the leachate produced in the waste dump, its leakage poses a great threat to groundwater and biodiversity in the area.
It is located in Port Harcourt, the commercial hub of South-South, Nigeria along Igwuruta/Eneka road and 9km from Okpoka River and Otamiri River. It receives around 45,600 tonnes of MSW annually and already has about 12 million tonnes of waste in place.
The site lies in an area of 5 hectares and it is flooded almost all year round as rainfall in the area exceeds 2,500mm per annum. Due to this and the resultant flow of the flood which would have mixed with dumpsite leachate; groundwater, surface water, and soil contamination affect the 1.2 million people living around 10km radius from the site as the nearest building is just 200 meters away.
Nigeria, the most populous country in Africa with population exceeding 182 million people, is grappling with waste management issues. The country generates around 43.2 million tonnes of waste annually. By 2025 with a population of 233.5 million, Nigeria will be generating an estimated 72.46 million tonnes of waste annually at a projected rate of 0.85 kg of waste/capita/day. This means that Nigeria annual waste generation will almost equal its crude oil production which currently stands at approximately 89.63 million tonnes per year.
Also, at an estimated annual waste generation figure of 72.46 million tonnes, Nigeria will be generating about one-fourth of the total waste that will be produced in the whole of Africa. This is scary and if proper attention is not paid to this enormous challenge, Nigeria might become the “Waste Capital of Africa”.
Waste is a Resource for Nigeria
Nonetheless, this challenge can be turned into a blessing because waste is a resource in disguise. If its potential is properly tapped, waste management can create employment, enable power generation, create a waste-based economy and contribute to economic diversification which Nigeria. There is no doubt that this is achievable because we have examples of countries already utilizing their waste judiciously.
Some good examples of sustainable waste management systems that can be implemented in Nigeria includes
Incheon (South Korea) where its Sudokwon landfill receives about 20,000 tons of waste daily which is converted into electric power, has a water recycling and desalination facility, and has created more than 200 jobs;
Los Angeles (USA) which produces electric power enough for 70,000 homes in its Puente Hills landfill;
Germany whose sophisticated waste processing systems through recycling, composting, and energy generation has already saved the country 20% of the cost of metals and 3% of the cost of energy imports;
Sweden, whose recycling is so revolutionary that the country had to import waste; and
Flanders, Belgium which possesses the best waste diversion rate in Europe with 75% of their waste being reused, recycled or composted. An interesting fact is that per capita waste generation rate in Flanders is more than twice that of Nigeria at 1.5 kg/day.
Waste Management Outlook for Nigeria
Below are some of the major things the government need to do to judiciously utilize the free and abundant resource available in the form of trash in Nigeria:
Firstly, attention needs to be paid to building the human resource potential of the country to build the required capacity in conceptualizing fit-for-purpose innovative solution to be deployed in tackling and solving the waste challenge.
While knowledge exchange/transfer through international public private partnership is a possible way in providing waste management solution, it is not sustainable for the country especially because there is already an unemployment problem in Nigeria. Hence, funding the training of interested and passionate individuals and entrepreneurs in waste management is a better way of tackling the waste crisis in Nigeria.
Olusosun is the largest dumpsite in Nigeria
The Federal Government through the Petroleum Trust Development Fund (PTDF) and National Information Technology Development Agency (NITDA) of the Ministry of Communication currently sponsor students to study oil and gas as well as information technology related subjects in foreign countries in the hope of boosting manpower in both sectors of the economy. The same approach should be used in the waste management sector and this can be handled through the Federal Ministry of Environment.
Interestingly, waste generation is almost at par with crude oil production in Nigeria. Therefore, equal attention should be paid to waste-to-wealth sector. Needless to say, this is important as there is no university in Nigeria currently offering waste management as a stand-alone course either at undergraduate or postgraduate level.
The Rationale for National Waste Strategy
Secondly, there is an urgent need for a strong National Waste Management Strategy to checkmate the different types of waste that enters the country’s waste stream as well as the quantity of waste being produced. To develop an effective national waste strategy, a study should be carried out to understand the country’s current stream of waste, generation pattern, and existing management approach. This should be championed by the Federal Ministry of Environment in conjunction with State and Local Government waste management authorities.
Once this is done, each State of the Federation will now integrate their own individual State Waste Management Plan into that of the Federal Government to achieve a holistic waste management development in Nigeria. By so doing, the government would also contribute to climate change mitigation because the methane produced when waste degrades is 25 times more potent than carbon dioxide (a major greenhouse gas known to many and contributor to global warming).
The Need for Financial Incentives
Finally, the government needs to support existing waste management initiatives either through tax-holiday on major equipment that need to be imported for their work and/or on their operation for a certain period of time. Also, if workable, the government can float a grant for innovative ideas and provide liberal subsidies in waste management to jumpstart the growth of the sector.
Lastly, the Government of Nigeria can raise a delegation of experts, entrepreneurs, industry professionals, academia, and youngsters to visit countries with sound waste management strategy for knowledge sharing, capacity-building, technology transfer and first-hand experience.
Note: The unedited version of the article can be found at this link
If you’re looking for ways to create a sustainable and energy-efficient home, make sure to consider your gardening practices. Gardening is a great way to produce your own fruits and vegetables. If you’re gardening, you’re already helping to reduce plastic waste because your food is coming right from your backyard rather than from the store.
You can become even more green by practicing sustainable gardening! Sustainable gardening uses principles and practices that help to protect the environment without doing further harm. It embraces organic gardening methods, conserves resources, and substitutes harmful practices (such as using pesticides) with more eco-friendly practices. And not only is it good for the environment, but it can also help save you money!
Here are 5 ways you can begin using sustainable practices in your own garden.
Reduce energy use
When planting and maintaining your garden, look for ways that you can be more energy efficient and create less pollution. For example, instead of using gas or electric-powered tools, look for tools that you can use by hand. Using a cheap cordless battery powered drill instead of an electric powered drill. Dig with shovels, clip with pruners, weed by hand.
Another way to reduce energy is to consider how you’re protecting your garden. Some people like to put an electric fence around their garden to keep out deer and other animals. Electric fences use painful electric shocks to deter animals from entering; depending on the setting of the fence, these shocks can be harmful to wildlife, pets, and humans. Instead of an electric fence, use a metal fence. A metal critter fence saves energy, is more cost-efficient, and does not harm animals.
Water is a precious, limited resource. Instead of watering your garden from a hose, create a collection system out of rain barrels. A rain barrel system collects runoff from your gutters when it rains. You can then empty the water from the container as needed to water your garden and other areas of your lawn. Sometimes we water the plants too much than needed. It also helps a lot in saving water that we know how much or when to water our plants. There are freely given learning materials about this all over the internet. One place in particular, the Occupy The Farm website, gives simple yet detailed guides regarding this.
You should also keep in mind that runoff from your garden makes its way back into the water supply. Herbicides or pesticides contain harmful chemicals that can contaminate our water. Using natural herbicides or pesticides, such as vinegar, can still help kill weeds and prevent pests without harming the environment.
Make your garden a habitat
Sustainable gardening can help you create a backyard wildlife habitat. Even if you’re hoping to keep larger animals out of your veggies, there is a way to open up your garden to smaller critters. There are certain plants you can grow that will help provide food and shelter to animals such as bees, butterflies, and birds. Habitats will vary by area.
Grow native plants
Growing plants that are native to your area means that the plants will naturally thrive in their environment. They’ll do well in the existing light, moisture, and soil conditions so you won’t have to put as much effort into taking care of them. Another reason to grow native plants is that they won’t disrupt the ecosystem. Non-native plants can seed and spread to surrounding areas and prevent native species from growing.
You can save seeds from your plants from season to season. For example, if tomatoes are native to your area and did well in your garden, save the seeds from one of your tomatoes to plant again next year. Some people also like to scout out woods and fields near their home for native plants that they can seed in their own garden.
Composting is good for you and for the environment! When you compost waste, there is less material going into the landfill. That waste then creates an organic material that you can use in your garden. Compost helps maintain soil quality and fertility, serves as a natural fertilizer, increases water retention, and improves plant growth.
It is easy to start composting. There are a few different types of composters you can buy or create. Enclosed bins are the most practical method for most home gardeners. The type of materials you can compost will vary slightly depending on your composting strategy. In addition to various types of food waste, you can also add yard waste such as leaves or grass clippings.
Sustainable gardening practices don’t just help you save money, they help you protect the environment. Look over your current gardening practices to see if there are ways that you can reduce the amount of energy you’re using, if there are ways for you to produce less waste, and if there are ways you can help your local ecosystem.
As we go about our daily lives, it’s always a good idea to think about how we can contribute to the community we belong to in tangible and appreciable ways. Improving our communities from the inside not only allows us to make things easier and more convenient for ourselves, but also for the people we meet and rely upon in our day-to-day. Besides this, it also helps us think of other people’s needs rather than just our own—an essential need if we’re to live happy and productive lives. One of the best ways of improving our communities is, of course, going green: the act of adopting an environmentally-friendly lifestyle. This means taking active steps to minimize our carbon footprint and reducing waste.
It doesn’t have to start out big—we can start with the smaller things, and work our way up from there. Instead of buying new printer ink cartridges, for example, we can try using compatible ink cartridges instead. These are ink cartridges that are made the same way as new printer ink cartridges, but cost way less to make than branded ones. Instead of throwing away our old or obsolete electronics and electrical goods, we can look into getting them repaired. Another example of that is to refurbish old drones instead of buying new.
By taking up these eco-friendly practices, our communities will become cleaner, more energy-efficient, and much healthier places to live in, alongside other very practical and tangible benefits that everyone will appreciate.
Not convinced? Well, hopefully listing out those benefits in full below will convince you. Read on as we go through all the biggest reasons why going green is the best thing you can do for your community.
A healthier community
Enacting green and eco-friendly practices in your community will have the immediate effect of making it healthier for the individuals who live in it, enabling them to live longer, happier, and more productive lives. This can be considered as the most important benefit, seeing as we can tie so many health conditions and diseases to having an environmentally-negligent lifestyle. By going green, you can avoid these potential risks from taking hold in your community.
For example, recycling and minimizing trash or garbage helps makes your immediate surroundings cleaner and more attractive to look at. This causes disease-carrying pests such as insects and rodents to be driven away from your community, which then results in less people catching those diseases.
Another example is having the vehicles in your community switch to more eco-friendly fuel types will result in cleaner and healthier air, as well as reduce the chances of children and the elderly from getting respiratory diseases. Many companies like popgear use recycled material in their clothing. These and a whole lot more are attainable by going green.
One of the main tenets of going green is to be conservative when it comes to the usage of utilities, such as electricity, gas, water, and so on. It goes without saying that using too much of these obviously strains the environment.
For example, the excessive and unnecessary use of electricity when it’s clearly not needed increases the power demand from power plants, which in turn increases the amount of fuel being used to supply that energy. This uses up our remaining fossil fuels at an alarming rate, while also depositing more pollutants into the atmosphere and environment. The same goes for gas and other utilities.
By being smarter and more conscious about using these precious resources in our homes, we can reduce the impact we have on the environment by quite a large degree. It will help ease the strain our environment is currently experiencing in providing us these resources and ensure that they don’t run out as quickly as they would have if we continued being unnecessarily wasteful with our usage.
Besides this, conserving energy and resources also helps us save on our utility bills. Obviously, the less power, water, and gas we use in our day-to-day, the less we’ll be charged when our monthly bills come in. Up to 20% of expanses per household, according to the US Environmental Protection Agency, are saved, especially if we adopt changes such as using solar panels rather than relying on our electrical grid. This is a huge chunk of money no matter how you slice it!
Durable and stronger homes and and structures
Let’s not mince words about it: eco-friendly and environmentally-conscious “green” products are more expensive than the brands that have an easier time fitting into our budget. However, we must consider that the former is also much more durable than the latter, which will inevitably result in a lot of savings in the long run.
This can be seen the most in building construction materials, especially those involved in the building and repair of homes. For example, recycled decking, which is made from recycled plastic and wooden fibers, have been tested to last five times longer than traditional decking.
Bamboo, a self-sustaining perennial grass that can grow up to three feet in 24 hours, is lighter than most building materials and yet has greater compressive strength than brick and concrete. The best part about it is that it grows faster than it can be harvested, meaning that there’s no danger of running out of it anytime soon, no matter how extensively it’s used.
By creating your community’s homes and structures using these eco-friendly materials, you can help save the environment while also ensuring that the homes and shelters will last for as long as they’re needed.
A self-sufficient community
It’s a fact of life that we have to rely on big companies to get us the modern conveniences and essentials we need to get through the day. However, by going green, we can help reduce our reliance on them and become more independent in our lives.
For example, taking the initiative to install solar panels in every home in your community will allow it to become less dependent on the power that companies provide you with electricity. With enough time, your community will be generating enough excess power that the same company will be paying you for that excess. There’s also the fact that if something goes wrong with the power plant, your community won’t be subjected to the same annoying and disruptive blackout that other surrounding neighborhoods will be, as you’ll have enough solar power to last you the entire time.
Let’s say you’re not quite at that level yet, in terms of going green. How about supporting your local markets rather than your nearby supermarket? By doing so, you ensure that the food-growing sector of your community continues to earn a living while also retaining the ability to keep growing natural and organic produce. Doing so also cuts down on harmful emissions, as you won’t have to travel by car just to get the fresh food you need. Your community retains its independence while helping the environment.
There are many ways to improve one’s community from the inside, with one of the major and more effective ones being able to adopt eco-friendly and environmentally-conscious practices. By doing so, not only does the community benefit hugely in the end in terms of health, sustainability, and independence from big companies, but the environment as well.
Cities often compete with each other, whether they’re seeking to have the highest quality of life or fostering innovation. However, the increasing world population and a changing climate have made eco-friendly living a priority for residents and city leaders alike. This has now led to cities competing to be the most environmentally friendly. The global movement towards more sustainability is also pushing for more innovation and change. Here are 11 of the world’s most eco-friendly cities as well as a brief overview of what they’ve done to achieve that status.
Reykjavik is the capital of Iceland and ranks among the most eco-friendly cities in the world. This is partially due to their harnessing of abundant geothermal energy for power and keeping the freezing northern city warm. Their small population is densely packed into the city, so people can get around by walking, biking or via public transit.
The city is offering incentives to encourage people to drive electric cars, such as free parking and lower taxes. They’re also going the old-fashioned route by encouraging the other 96 percent of the population to ride public transit, including their brand-new hydrogen powered buses.
Vancouver is sandwiched between the ocean and the mountains, though the surrounding coast is covered in forests. The local administration found out that the city’s environmental footprint was just too big to be sustainable and decided to make some real changes. As a result of these initiatives, the city now has the lowest greenhouse gas emissions level for any major city in North American city.
They are doing yet even more to reduce the city’s footprint. For example, the city is doing a lot to attract clean technology companies and increase the number of green jobs. They’ve seen a 23 percent in green jobs since 2013. They’re also encouraging local food production so they can feed people without wasting energy transporting food from thousands of miles away.
San Francisco, California
San Francisco is one of the most environmentally conscious cities in the world. Where San Francisco stands out is the sheer number of ways it is lowering its ecological footprint from the top down.
For example, consumers and city agencies systematically shop for organic and locally sourced food. Living waste-free seems like a dream, but the city itself has that as a goal by 2020. The city is roughly eighty percent of the way there. They’ve dramatically reduced waste and increased recycling, while they encourage businesses and individuals alike to switch to reusable containers. As a matter of fact, San Francisco became the first city in the US to completely ban plastic bottles. A large part of the organic waste produced in the city is turned into compost and used by local farmers.
San Francisco is also ahead of the curve in terms of renewable energy. The city has many zero emissions and hybrid electric buses. Solar installations in the Bay Area are surprisingly common. This is in part because they pay themselves off in less than seven years when you take rebates and tax credits into account. For example, San Francisco’s GoSolarSF program encourages people to install solar panels. The average homeowner receives 300 dollars per kilowatt and up to 2000 dollars per kilowatt if the residents are considered low income. This will remain in effect even if the federal tax rebates for solar installations start to phase out.
Another side effect of the eco-conscious population is that renewable energy becomes a selling point for properties that have it. The best solar companies in the Bay Area, including firms like Semper Solaris, install quality solar panel systems that add value to your home. They also make it easier for people in the region to afford systems by adjusting them to their particular needs. Not only that, but they also offer battery storage so users can still use solar energy when the sun isn’t shining. The increased home value is based in part on the future reduced utility bills the homeowners expect to receive.
Helsinki sits on the Gulf of Finland. It stands out for its delicate balance between eco-friendliness and tourism. Roughly three in four hotel rooms in the city are certified as eco-friendly. Most of the remainder have some environmental impact reduction plan in place to reduce energy consumption, minimize waste, and lower the environmental impact of their food and water supply.
The city makes use of wind energy and solar power. The “green district” Viiki is an experiment in sustainability. This is why the first solar powered apartment building in Finland is located here.
Capetown, South Africa
Capetown is another example of a city that has gone above and beyond to reduce its ecological footprint. One of the ways they are doing so is by reducing their reliance on unsustainable energy sources and turning to alternatives like solar energy instead. And it has paid off, especially when considering the amount of sunlight the city enjoys every year.
They’ve also heavily invested in wind power. As a matter of fact, the city has started focusing on building wind farms since 2008. And the city made it a goal to meet 10% of its energy needs using renewable energy sources by 2020, which could very well be possible given all the different initiatives they’ve started.
They’re also trying to pattern the behavior and habits of residents and push them to adopt a more outdoorsy lifestyle. Not only that, but they’re facilitating bike transport by allowing bicycles for free on their My Citi express bus service.
Berlin is one of the most famous and historical cities in the world, and the reason why it made that list is also tied to history. After WWI, residents in the city were forced to become very self-reliant, and had to find ways to grow and raise their own food, which is a tradition that continues to this day. Germans in general also value their green spaces and gardening.
Berlin is also doing a lot to accommodate electric vehicles owners by adding over 400 charging stations around the country. They’re also trying to raise awareness among gas vehicle owners and trying to sway them into going electric. Not only that, but Berliners also are more prone to using public transit or sharing vehicles then using their personal car.
This is the second west coast city in this list, and it shouldn’t come as a surprise considering that the west coast is and has always been a hotbed for the environmentalist movement. And while the city’s population keeps on growing, they are continually working to minimize the effect of the city’s activity on the environment. They also put a ban recently on plastic bags to curb their effect on the ecosystem, with other cities on the west coast following suit.
But one of the main reasons why Portland made this list is the people of the city. Environmental consciousness is part of the city’s DNA, and Portlanders take it to the next level. Did you know that roughly 25% of the city’s workers do their commute through carpooling, biking, or public transit? Out of all the people in the city, 8% also stated that they only use their bike for transportation. This is thanks in part to the city’s massive bike path and lane system.
The city also gets 33% of its energy from renewable sources and recuperates roughly 1,200,000 tons from the 2,434,840 tons of waste they produce every year, which is pretty impressive for a city its size. The city also managed to cut their carbon emissions by as much as 17%, even with the increasing population.
Amsterdam is bar none one of the most avant-garde cities when it comes to environmental initiatives, and has worked for a long time to limit its energy consumption from unsustainable sources. As a matter of fact, the city was one of the first to introduce widespread sustainability initiatives with a goal to reach a wide variety of benchmarks by the year 2020.
One of the main things people remember when they come to the city is the sheer number of cyclists, and Amsterdammers do love their bikes. But the city also did a lot to popularize electric vehicles, and owners can charge their vehicles in one of the 300 charging ports you’ll find all over the city. People in the city are also increasingly turning to solar energy and sustainable local farming. More people from the city are starting to grow their own food as well.
With over 50 bridges and 14 islands, Stockholm has done a lot to improve the city and allow citizens to live a more sustainable life. The city also set a goal to eliminate the use of fossil fuels by 2040. In addition, they’re getting assistance from the European Union to become a smarter city.
One of the ways the city has managed to be more energy efficient was by turning to biofuels, which are created from the city’s sewage waste. A large portion of cars in the city are powered using this biofuel. They also managed to recuperate some of the heat generated by their massive stadium. This heat can be used to heat over 1000 units in the city.
The capital of Denmark has also started to build a reputation as an ecofriendly city, and is taking steps to continue in the right direction and support eco-friendly initiatives. And this is mainly due to the city’s sustained and massive investments in clean infrastructure and renewable energy sources.
They also set the lofty goal of becoming the first major city in the world to achieve CO? neutrality by the year 2020. And residents in the city are also doing their part for this goal to become a reality. Less than a third of households in the city own a car, and people in Copenhagen are also big on cycling. As a matter of fact, it’s not uncommon for hotels in the city to provide guests with a bicycle upon arrival. The city also has one of the most extensive bike lane networks in Europe.
Another thing that sets the city apart is how many people choose to eat organic there. About a quarter of all the food sold in the city’s markets is organic, and they’re also big proponents of local farming, which further reduces their carbon footprint.
Considering the amount of natural beauty Brazil is nestled in, it shouldn’t be a surprise to see a Brazilian city on this list. Curitiba might not be as well-known as Rio and Sao Paulo, but it is known as one of the world’s green capitals. Where they excel is when it comes to recycling. As a matter of fact, it is said that about 70% of the waste produced in the city is recycled in the form of derived products or energy.
The city also puts a lot of importance on urban planning and has one of the best public transit systems in South America. Most people in the city rely on public transport too. The city is also not overly developed and has tons of green spaces with over 16 parks and 14 forests near and around the city’s core.
Presence of trees make a city appear more vibrant and eco-friendly
To incentivize cleanliness around the city, they installed a program that allows people to return and exchange recyclables for things like tokens, sweets, snacks, and cash. Not only does it encourage people to recycle more, but the program is also feeding over 7000 people in need in the city.
The most eco-friendly cities in the world are seeking to provide a better environment for residents while reducing their impact on the planet, and they’re providing an example to the world that the rest can follow. We can only expect the trend to grow from now and into the future, and for residents from cities all around the world to start pushing for more green initiatives where they are.
You know the saying: One person’s trash is another’s treasure. When it comes to recovering energy from municipal solid waste — commonly called garbage or trash— that treasure can be especially useful. Instead of taking up space in a landfill, we can process our trash to produce energy to power our homes, businesses and public buildings.
In 2015, the United States got about 14 billion kilowatt-hours of electricity from burning municipal solid waste, or MSW. Seventy-one waste-to-energy plants and four additional power plants burned around 29 million tons of MSW in the U.S. that year. However, just 13 percent of the country’s waste becomes energy. Around 35 percent is recycled or composted, and the rest ends up in landfills.
Recovering Energy Through Incineration
The predominant technology for MSW-to-energy plants is incineration, which involves burning the trash at high temperatures. Similarly to how some facilities use coal or natural gas as fuel sources, power plants can also burn MSW as fuel to heat water, which creates steam, turns a turbine and produces electricity.
Several methods and technologies can play a role in burning trash to create electricity. The most common type of incineration plant is what’s called a mass-burn facility. These units burn the trash in one large chamber. The facility might sort the MSW before sending it to the combustion chamber to remove non-combustible materials and recyclables.
These mass-burn systems use excess air to facilitate mixing, and ensure air gets to all the waste. Many of these units also burn the fuel on a sloped, moving grate to mix the waste even further. These steps are vital because solid waste is inconsistent, and its content varies. Some facilities also shred the MSW before moving it to the combustion chamber.
Another method for converting trash into electricity is gasification. This type of waste-to-energy plant doesn’t burn MSW directly, but instead uses it as feedstock for reactions that produce a fuel gas known as synthesis gas, or syngas. This gas typically contains carbon monoxide, carbon dioxide, methane, hydrogen and water vapor.
Approaches to gasification vary, but typically include high temperatures, high-pressure environments, very little oxygen and shredding MSW before the process begins. Common gasification methods include:
Air-fed systems, which use air instead of pure oxygen and temperatures between 800 and 1,800 degrees Celsius.
Plasma or plasma arc gasification, which uses plasma torches to increase temperatures to 2,000 to 2,800 degrees Celsius.
Syngas can be burned to create electricity, but it can also be a component in the production of transportation fuels, fertilizers and chemicals. Proponents of gasification report that it is a more efficient waste-to-energy method than incineration, and can produce around 1,000 kilowatt-hours of electricity from one ton of MSW. Incineration, on average, produces 550 kilowatt-hours.
Challenges of MSW-to-Energy
Turning trash into energy seems like an ideal solution. We have a lot of trash to deal with, and we need to produce energy. MSW-to-energy plants solve both of those problems. However, a relatively small amount of waste becomes energy, especially in the U.S.
Typical layout of MSW-to-Energy Plant
This lack may be due largely to the upfront costs of building a waste-to-energy plant. It is much cheaper in the short term to send trash straight to a landfill. Some people believe these energy production processes are just too complicated and expensive. Gasification, especially, has a reputation for being too complex.
Environmental concerns also play a role, since burning waste can release greenhouse gases. Although modern technologies can make burning waste a cleaner process, its proponents still complain it is too dirty.
Despite these challenges, as trash piles up and we continue to look for new sources of energy, waste-to-energy plants may begin to play a more integral role in our energy production and waste management processes. If we handle it responsibly and efficiently, it could become a very viable solution to several of the issues our society faces.
Concerts, outdoor festivals and other gatherings with large numbers of people can generate an immense amount of waste. Not only is this wasteful potentially off-putting and unsanitary, but it can cause damage to both the environment and the appeal of the venue.
Many event organizers and planners focus on maximizing the appeal of their events via marketing, big names and other elements designed to draw in crowds. However, any outdoor event in particular must take into account the challenges posed by waste management and recycling in order to ensure sanitary and environmentally-friendly conditions.
In order to maximize the recycling potential of any outdoor venue, the following actions should be considered by any planning team prior to the event.
Partner with Green Waste Removal Companies
One of the biggest ways any event organizer(s) can contribute toward energy efficiency and more environmentally-friendly outcomes is to procure the services of a green waste disposal service.
Anyone who has organized an outdoor event before – especially in an open space or other area where standard permanent facilities do not exist – understands the need for waste disposal. Companies such as Satellite Industries provide on-site portable restroom services that dispose of waste in efficient and environmentally-friendly ways.
Some companies even use this bio-waste to create clean energy from the output, helping to further minimize its impact on the environment.
Position Recycling Bins Ideally
Virtually every outdoor venue generates large amounts of waste. From bottles and cans to miscellaneous items that find their way onto the ground or in trash cans, it can be a mess. When planning any outdoor event, organizers will have full control over where the flow of traffic is and how/where people congregate.
With this knowledge available, event planners can take steps to ensure that recycling bins and containers are optimally positioned throughout the premises to capture the largest amount of waste possible. Depending on the event and its offerings, you may need separate containers for aluminum, plastic, paper and/or glass.
Ask for Help
Especially true when coordinating events for charities, local organizations and non-profits, a small volunteer force may be both obtainable and very useful in facilitating recycling. With the help of a few volunteers, a team can scour the venue during and after the event in order to retrieve recyclables from the receptacles. In addition, these volunteers can also help with any litter found on the grounds during the event, thereby minimizing the amount of clean-up time after the event has concluded.
Contact Local Recycling Centers
Your local recycling center, landfill or governmental body may have additional resources to provide in the pursuit of improving recycling at an event. Some cities have independent recycling agencies that offer free receptacles and pick-up for recycled goods. Others offer comprehensive guides on how to position recycling areas and maximize participation from event attendees. Even the federal government offers recycling resources to those who wish to improve waste outcomes.
Outdoor festivals, such as Glastonbury, generates a tremendous amount of waste.
Ultimately, this information and assistance can go a long way toward maximizing recycling at any event, as these entities will have plenty of expertise and experience in these areas. Such advice can help further improve environmentally-friendly outcomes and reduce the incidence of waste at any event.
The massive amount of potential waste generated during any outdoor event can be disruptive both to the event and the environment. Event organizers who want to maximize cleanliness and environmental friendliness can take steps to reduce the amount of discarded materials that end up in landfills and other centers. By working with local agencies, procuring volunteers, partnering with waste removal agencies and using recycling bins efficiently, the overall amount of waste at any outdoor event can be substantially reduced.
If you’re interested in green and environmental issues you may have heard the phrase ‘life-cycle assessment’ in relation to a particular product. It can be difficult to ascertain exactly what this life-cycle assessment involves – so we’re hoping to shed some light on the process, the different types of assessment that take place and explain what’s involved with each step.
A look at the bigger picture
Essentially, a product life-cycle assessment takes an overall view of that item’s impact on the environment – and in doing so, offers a true picture of how green that product really is. The aim is for consumers, manufacturers and policy makers to be given a true environmental picture of any product.
Although it’s an example that divides the opinion of environmentalists around the world, the Toyota Prius provides an interesting picture of why the product life-cycle assessment is required in a world driven by a company’s desire to be seen as green. The Prius is an electric-hybrid car which Toyota claims delivers an impressive 60 miles per gallon of fuel – a statistic that puts it as a firm environmental favourite.
However, there are claims that the construction methods used to create the batteries that power the Prius are hugely detrimental to the environment – with some sources saying the manufacturing plant impacts the environment so greatly that by the time a Prius is driven from the showroom – it’s already had the environmental impact it would take any other car 1,000 gallons of fuel to match.
What’s the verdict?
So, is the Prius good or bad? That’s not for us to decide – and we’re not suggesting one way or another, we’re simply using this as an illustration of how complex any environmental consideration can be in a product with such an intensive manufacturing process and prolonged lifespan. At the other end of the calculation you’d have to consider how long the Prius will run for – and whether that balances a supposedly negative building method.
Ingredients of product life-cycle assessment
The assessment is ordinarily broken down into different stages:
Extraction and processing of raw materials
This is a full understanding of the journey from source to point of manufacture that the building blocks of any product take. For example, in the manufacture of a table you would begin by looking at the trees that provide the wood, the logging process that takes them from forest to timber yard and the impact of the machinery used throughout that process.
You would repeat this process for every raw material that goes into the table’s manufacture.
Next comes the manufacturing itself – if machinery or any industrial process is used to piece our table together then resources used in that process must be considered when we look at the overall impact of the product on the environment.
The packaging that a product is delivered in is effectively another product in itself. Although unlikely in our table example, it’s not uncommon for extravagant packaging to represent 10-20% of a product’s recommended retail price. Curtis Packaging, an award-winning UK based sustainable packaging company suggest manufacturers pay careful consideration to the impact of packaging on a product’s overall green credentials – from raw materials to the point of disposal, the packing that adorns your product can have serious environmental considerations.
At first glance you could be forgiven for thinking marketing a product comes with no environmental impact – but you’d be wrong. From the printing of advertising materials – to the sales team’s 20,000 annual miles in company vehicles – there can be a lot of resource put into any marketing process. However, measurement is no mean feat – companies can find it difficult to differentiate between their overall carbon footprint and that associated with any one product.
Product use, re-use and maintenance
This is where the impact of a product moves from the manufacturer and into the hands of the consumer. What does typical use look like? How long is a product being used for? Does one person’s use vary compared to another’s? For our example table, the answers could be fairly simple – on the other hand, there’s a huge amount of variation when you look at a broad range of car drivers.
Packaging that adorns your product can have serious environmental impact.
For any product that requires maintenance, the LCA just became much more complex (again!) – just as packaging represented an entirely separate product that requires its own assessment – a similar process is required when a car receives a tank of fuel, a top up of coolant, brake fluid, spark plugs, brake pads… hopefully you get the picture (hint – it’s complex and sprawling!)
However difficult it might be to anticipate, it’s an environmental imperative that big industry is aware of the impact they have – even when their product has left their hands.
Recycling, disposal and waste at the end of the product’s life
From pizza boxes to old cars, it’s easy to think of their job as being done when they’re waved off to a recycling bin or breaker’s yard – but environmentally this could just be the beginning of their impact.
In terms of recycling – the effort and impact of the process must be outweighed by the benefit of the salvaged material, it’s often in life-cycle assessments that decisions are made around what is worth recycling – and what should be destined for landfill. If landfill is the ultimate resting place for any product, what does the deterioration process look like and what does that mean to the environment in the short, medium and long-term?
Then, to bring the assessment cycle full circle – any product that can be processed and re-used re-enters the assessment cycle back at the extraction and processing of raw materials stage…
Ultimately, what is the life-cycle assessment done for?
There’s no one reason that a life-cycle assessment is done. For some companies, they’re keen to explain the full back-story of the product. For others, it can be an exercise in understanding the full process and highlighting any areas that can be financially streamlined – it certainly provides a solid baseline from which improvements can be made.
For the most environmentally ethical companies, the life-cycle assessment gives a true picture of the impact they have on the well-being of the planet – and offers a chance to get a full and honest picture of the moves they and their partners can make in creating a product that fulfils the requirements of the environment – as well as those of the customer and shareholders.
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