Biomethane Utilization Pathways

biomethane-transportBiogas can be used in raw (without removal of CO2) or in upgraded form. The main function of upgrading biogas is the removal of CO2 (to increase the energy content) and H2S (to reduce risk of corrosion). After upgrading, biogas possesses identical gas quality properties as  natural gas, and can thus be used as natural gas replacement. The main pathways for biomethane utilization are as follows:

  • Production of heat and/or steam
  • Electricity production / combined heat and power production (CHP)
  • Natural gas replacement (gas grid injection)
  • Compressed natural gas (CNG) & diesel replacement – (bio-CNG for transport fuel usage)
  • Liquid natural gas (LNG) replacement – (bio-LNG for transport fuel usage)

Prior to practically all utilization options, the biogas has to be dried (usually through application of a cooling/condensation step). Furthermore, elements such as hydrogen sulphide and other harmful trace elements must be removed (usually trough application of an activated carbon filter) to prevent adverse effects on downstream processing equipment (such as compressors, piping, boilers and CHP systems).

Although biogas is perfectly suitable to be utilized in boilers (as an environmental friendlier source for heat and steam production), this option is rather obsolete due to the abundance of alternative sources from solid waste origin.

Most Palm Oil Mills are already self-reliant with respect to heat and steam production due to the combustion of their solid waste streams (such as EFB and PKS). Consequently, conversion to electricity (by means of a CHP unit) or utilization as natural gas, CNG or LNG replacement, would be a more sensible solution.

The biogas masterplan as drafted by the Asia Pacific Biogas Alliance foresees a distribution in which 30% of the biomethane is used for power generation, 40% for grid injection and 30% as compressed/liquefied fuel for transportation purpose (Asian Pacific Biogas Alliance, 2015).

For each project, the most optimal option has to be evaluated on a case to case basis. Main decision-making factors will be local energy prices and requirements, available infrastructure (for gas and electricity), incentives and funding.

For the locations where local demand is exceeded, and no electricity or gas infrastructure is available within a reasonable distance (<5-10 km, due to investment cost and power loss), production of CNG could offer a good solution.

Moreover, during the utilization of biogas within a CHP unit only 40-50% of the energetic content of the gas is converted into electricity. The rest of the energy is transformed into heat. For those locations where an abundance of heat is available, such as Palm Oil Mills, this effectively means that 50-60% of the energetic content of the biogas is not utilized. Converting the biogas into biomethane (of gas grid or CNG quality) through upgrading, would facilitate the transportation and commercialisation of over 95%  of the energetic content of the biogas.

Within the CNG utilization route, the raw biogas will be upgraded to a methane content of >96%, compressed to 250 bar and stored in racks with gas bottles. The buffered gas (bottles) will be suitable for transportation by truck or ship. For transportation over large distances (>200km), it will be advised to further reduce the gas volume by converting the gas to LNG (trough liquefaction).

Overall the effects and benefits from anaerobic digestion of POME and utilization of biomethane can be summarized as follows:

  • Reduction of emissions i.e. GHG methane and CO2
  • Reduced land use for POME treatment
  • Enhanced self-sufficiency trough availability of on-site diesel replacement (CNG)
  • Expansion of economic activities/generation of additional revenues
    • Sales of surplus electricity (local or to the grid)
    • Sales of biomethane (injection into the natural gas grid)
    • Replacement of on-site diesel usage by CNG
    • Sales of bottled CNG
  • Reducing global and local environmental impact (through fuel replacement)
  • Reducing dependence on fossil fuel, and enhances fuel diversity and security of energy supply
  • Enhancement of local infrastructure and employment
    • Through electrical and gas supply
    • Through Fuel (CNG) supply

Co-Authors: H. Dekker and E.H.M. Dirkse (DMT Environmental Technology)

Note: This is the second article in the special series on ‘Sustainable Utilization of POME-based Biomethane’ by Langerak et al of DMT Environmental Technology (Holland). The first article can be viewed at this link

Analysis of Agro Biomass Projects

The current use of agro biomass for energy generation is low and more efficient use would release significant amounts of agro biomass resources for other energy use. Usually, efficiency improvements are neglected because of the non-existence of grid connections with agro-industries.

Electricity generated from biomass is more costly to produce than fossil fuel and hydroelectric power for two reasons. First, biomass fuels are expensive. The cost of producing biomass fuel is dependent on the type of biomass, the amount of processing necessary to convert it to an efficient fuel, distance to the energy conversion plant, and supply and demand for fuels in the market place. Biomass fuel is low-density and non-homogeneous and has a small unit size.

Consequently, biomass fuel is costly to collect, process, and transport to facilities.  Second, biomass-to-energy facilities are much smaller than conventional fossil fuel-based power plants and therefore cannot produce electricity as cost-effectively as the fossil fuel-based plants.

Agro biomass is costly to collect, process, and transport to facilities.

The biomass-to-energy facilities are smaller because of the limited amount of fuel that can be stored at a single facility. With higher fuel costs and lower economic efficiencies, solid-fuel energy is not economically competitive in a deregulated energy market that gives zero value or compensation for the non-electric benefits generated by the biomass-to-energy industry.

Biomass availability for fuel usage is estimated as the total amount of plant residue remaining after harvest, minus the amount of plant material that must be left on the field for maintaining sufficient levels of organic matter in the soil and for preventing soil erosion. While there are no generally agreed-upon standards for maximum removal rates, a portion of the biomass material may be removed without severely reducing soil productivity.

Technically, biomass removal rates of up to 60 to 70 percent are achievable, but in practice, current residue collection techniques generally result in relatively low recovery rates in developing countries. The low biomass recovery rate is the result of a combination of factors, including collection equipment limitations, economics, and conservation requirements. Modern agricultural equipment can allow for the joint collection of grain and residues, increased collection rates to up to 60 percent, and may help reduce concerns about soil compaction.

Palm Kernel Shells: An Attractive Biomass Fuel for Europe

palm-kernel-shellsEurope is targeting an ambitious renewable energy program aimed at 20% renewable energy in the energy mix by 2020 with biomass energy being key renewable energy resource across the continent. However, the lack of locally-available biomass resources has hampered the progress of biomass energy industry in Europe as compared with solar and wind energy industries. The European biomass industry is largely dependent on wood pellets and crop residues.

Europe is the largest producer of wood pellets, which is currently estimated at 13.5 million tons per year while its consumption is 18.8 million tons per year. The biggest wood pellet producing countries in Europe are Germany and Sweden. Europe relies on America and Canada to meet its wood pellet requirements and there is an urgent need to explore alternative biomass resources. In recent years, palm kernel shells (popularly known as PKS) from Southeast Asia has emerged has an attractive biomass resources which can replace wood pellets in biomass power plants across Europe.

What are Palm Kernel Shells

Palm kernel shells are the shell fractions left after the nut has been removed after crushing in the Palm Oil mill. Kernel shells are a fibrous material and can be easily handled in bulk directly from the product line to the end use. Large and small shell fractions are mixed with dust-like fractions and small fibres.

Moisture content in kernel shells is low compared to other biomass residues with different sources suggesting values between 11% and 13%. Palm kernel shells contain residues of Palm Oil, which accounts for its slightly higher heating value than average lignocellulosic biomass. Compared to other residues from the industry, it is a good quality biomass fuel with uniform size distribution, easy handling, easy crushing, and limited biological activity due to low moisture content.

Press fibre and shell generated by the palm oil mills are traditionally used as solid fuels for steam boilers. The steam generated is used to run turbines for electricity production. These two solid fuels alone are able to generate more than enough energy to meet the energy demands of a palm oil mill.

Advantages of Palm Kernel Shells

PKS has almost the same combustion characteristics as wood pellets, abundantly available are and are cheap. Indonesia and Malaysia are the two main producers of PKS. Indonesian oil palm plantations cover 12 million hectares in Indonesia and 5 million hectares in Malaysia, the number of PKS produced from both countries has exceeded 15 million tons per year. Infact, the quantity of PKS generated in both countries exceeds the production of wood pellets from the United States and Canada, or the two largest producers of wood pellets today.

Interestingly, United States and Canada cannot produce PKS, because they do not have oil palm plantations, but Indonesia and Malaysia can also produce wood pellets because they have large forests. The production of wood pellets in Indonesia and Malaysia is still small today, which is less than 1 million tons per year, but the production of PKS is much higher which can power biomass power plants across Europe and protect forests which are being cut down to produce wood pellets in North America and other parts of the world.

PKS as a Boiler Fuel

Although most power plants currently use pulverized coal boiler technology which reaches around 50% of the world’s electricity generation, the use of grate combustion boiler technology and fluidized bed boilers is also increasing. Pulverized coal boiler is mainly used for very large capacity plants (> 100 MW), while for ordinary medium capacity uses fluidized bed technology (between 20-100 MW) and for smaller capacity with combustor grate (<20 MW). The advantage of boiler combustion and fluidized bed technology is fuel flexibility including tolerance to particle size.

When the pulverized coal boiler requires a small particle size (1-2 cm) like sawdust so that it can be atomized on the pulverizer nozzle, the combustor grate and fluidized bed the particle size of gravel (max. 8 cm) can be accepted. Based on these conditions, palm kernel shells has a great opportunity to be used as a boiler fuel in large-scale power plants.

Use of PKS in pulverized coal boiler

There are several things that need to be considered for the use of PKS in pulverized coal boilers. The first thing that can be done is to reduce PKS particle size to a maximum of 2 cm so that it can be atomized in a pulverized system. The second thing to note is the percentage of PKS in coal, or the term cofiring. Unlike a grate and a fluidized bed combustion that can be flexible with various types of fuel, pulverized coal boilers use coal only. There are specific things that distinguish biomass and coal fuels, namely ash content and ash chemistry, both of which greatly influence the combustion characteristics in the pulverized system.


PKS has emerged as an attractive biomass commodity in Japan

Coal ash content is generally greater than biomass, and coal ash chemistry is very different from biomass ash chemistry. Biomass ash has lower inorganic content than coal, but the alkali content in biomass can change the properties of coal ash, especially aluminosilicate ash.

Biomass cofiring with coal in small portions for example 3-5% does not require modification of the pulverized coal power plant. For example, Shinci in Japan with a capacity of 2 x 1,000 MW of supercritical pulverized fuel with 3% cofiring requires 16,000 tons per year of biomass and no modification. Similarly, Korea Southeast Power (KOSEP) 5,000 MW with 5% cofiring requires 600,000 tons per year of biomass without modification.

PKS cofiring in coal-based power plants

Pulverized coal-based power plants are the predominant method of large-scale electricity production worldwide including Europe. If pulverised fuel power plants make a switch to co-firing of biomass fuels, it will make a huge impact on reducing coal usage, reducing carbon emissions and making a transition to renewable energy. Additionally, the cheapest and most effective way for big coal-based power plants to enter renewable energy sector is biomass cofiring. Palm kernel shells can be pyrolyzed to produce charcoal while coal will produce coke if it is pyrolyzed. Charcoal can be used for fuel, briquette production and activated charcoal.

Tips on Writing a Research Paper on Solar Energy

The share of energy received from the Sun is steadily increasing every year. Last year, the global solar market increased by 26%. According to forecasts, in 2018 for the first time, the mark of 100 gigawatts of new installed capacity per year will be passed all over the world. Writing a research paper on solar energy is not an easy assignment, as you will have to deal with lot’s of statistics, results of experiments, and, surprisingly, sociology — the usage of alternative sources of energy are strongly connected with the social issues and moods. In this article, you’ll receive some tips on how to write a stellar research paper on solar energy and impress your professor.

We are sure you know how to structure a research paper, and you won’t forget about an engaging thesis (problem) statement. Our tips will cover the latest trends you should mention and the discussions related to the usage of solar energy, pros, cons and exciting facts.

Pay Attention to the Latest Trends

Analysts have identified trends in the solar energy market in the near future.

  • An increasing number of countries are developing solar energy projects at the national level. In 2016, there were 32 such countries, at the end of last year already 53. Tenders for the development of solar energy are planned in 23 countries.
  • In the United States in the next 4 years, the number of states installing more than 1 gigawatt will reach 18. They will account for 80% of all US photovoltaic plants.
  • Reducing the cost of solar energy can be achieved through the use of more powerful modules, which will reduce the proportion of equipment and maintenance costs.
  • The role of electronics operating at the level of a single photovoltaic panel will grow. Now micro-inventors and current converters for one module are not used very widely.
  • Prices for stationary solar systems in the world are falling, but in the USA they remain at the same level (the cost of watts of power for US home systems is the highest in the world). The price for a “sunny” watt from state to state can vary by 68 cents, and companies will have to look for ways to reduce production costs.

Talk about the Future

Naturally, interest in renewable energy sources will continue to grow. The year 2050 will be the point of no return – it is by this time that most countries will completely switch to clean energy. And in 2018 serious steps will be made in this direction.

The first to be hit will be coal power plants in Europe. To date, 54% of them are not profitable, and there are only for the sake of peak load. In 2018, Finland will ban the use of coal to generate electricity and increase the tax on carbon dioxide emissions. By 2030, the country plans to abandon this fuel completely.

The Indian coal mining company Coal India also plans to close 37 coal mines in March 2018 – their development has become uneconomical due to the growth of renewable energy. The company will save about $ 124 million on this, after which it will switch to solar power and install at least 1 GW of new solar capacity in India.

Don’t Focus Solely on Content

It is a no-brainer that the content of your research paper is the most essential part of your work. However, if you forget about formatting, citations, plagiarism, using valid academic sources, etc., your research paper can fail despite having an amazing thesis statement or the project idea.

When you start doing research, note down every link you use or want to use, every quote you like, every piece of statistical information. At first, it seems very dull and unnecessary — you think you can find this information at any moment. However, days pass, and you fail to make proper references, which can be a reason of being accused of plagiarism. Proofread your research paper several times, use online sources to check grammar and spelling, don’t forget about plagiarism checkers to stay on the safe side.

If you find out that writing a proper research paper on solar energy is too complicated for you now, or you don’t have enough time energy to deal with it, it is a wise choice to get affordable research paper writing by experts who can help you immediately with your assignment. When writing a research paper on solar energy don’t forget to check on the latest numbers and analytical data worldwide. Good luck!

Paying Less for Your Energy: A Handful of Practical Tips

There is little doubt that energy bills are a big drain on your finances, what with the Big Six energy providers hiking their prices recently, with two of them doing it twice within a year! What is one to do? Toe their line or search for the best and cheapest energy tariffs? Of course, you will save a pretty packet if you search for the cheapest energy rates. Find below certain practical tips that will enable you to find the right energy deal and save on money.

Avoid standard variable rate tariff

You need to be careful when your fixed tariff deal ends, for it is then that your energy provider will nudge you towards standard variable rate tariff. Their reason for doing so is simple, that is, to make money. These variable rate tariffs are expensive. According to the figures of previous year obtained from First Utility, will escalate your energy bill by an average of £262 annually. Not only are these variable rate tariffs expensive, but they also provide leeway for your energy supplier to hike costs.

The way out of this is to search for smaller suppliers that offer the best-buy tables and better services. You can do this by manually researching lists of energy suppliers or using online comparison sites. Spending time doing manual research can pay dividends as you can often find deals not apparent on switching sites, however the latter are much faster to use.

Power tip: When using switching sites, always check the box that says something like ‘include plans that require switching directly though the supplier’ as this will reveal even cheaper deals.

Today, the minnows are giving a run for money to the Big Six energy providers. These suppliers offer you a choice of long-term fix and even variable rate that are well under £1,000. Opting for a fixed rate tariff will give you a secure price on each unit of electricity for a set period, whereas variable rate tariff, where the price can fluctuate up and down.

So, to get the full price advantage don’t stick to your original supplier, but switch to a smaller one. It will certainly help in saving cash.

To fix or not to fix

In the past, variable rate tariffs tended to be cheaper, but this trend has changed. Today, the cheapest rates are offered on one-year fixes. Opting for it will save you money. This is because this type fixes the rate you pay for each unit of electricity, usually for a 12- to 18-month period.

The latest trend is to opt for two-year fixed deals. Whether it is one-year or two-year fixed deals, the idea is to avoid expensive variable standard tariffs. It needs to be noted that fixed deals are slightly more than the cheapest deals, if you are going in for long-term security. However, it certainly does not mean that you pay a fixed amount and be done away with it. It will still depend upon the amount of energy consumed, only the tariff per unit is somewhat reduced.

You need to be careful about some fixed deals that charge exit fees if you decide to leave early. Also, there is no guarantee that a fixed deal is the best long-term option, but if you want to give certainty over bills, this is the best choice.

Benefits of energy switching

Your local energy suppliers are the real beneficiary since they tend to charge more for electricity from people living in their vicinity. This is because they build a monopoly in the region and dictate the energy rates.

To break the stranglehold of your local energy supplier, you will do well to explore the possibility of moving away. This switching will certainly save you money. Of course, finding the cheapest supplier will primarily depend upon where you live. A little search will not only help you find cheap suppliers but also help you in comparing prices to find the best price.

If you are scared that switching from your current energy supplier will attract a penalty, if you decide to leave before the term expires, it will still be worth it. So, accept the penalty and you will still end up saving big.

Cutting your energy bills

If you are still in two minds regarding switching to a smaller energy supplier, you can still limit your energy bill in the following ways:

  • Ask for return of credited money: If you are paying a set amount by direct debit pay each month for gas and electricity, it will be a good idea to ask for a return of money during summer and spring. You may get it back with interest.
  • Save energy: Change the way you use your gas and electricity. This will reduce usage and save money.
  • Pay online: This could cut more than £10 off your annual bills.


Switching energy supplier is a big decision. However, if your current supplier is offering cheaper tariff than what you are currently using, it is wise to switch to it, rather than opt for a new energy supplier. You still end up saving money.

Share of Renewables in Energy Supply of UK

The Earth is facing a climate crisis, as the burning of fossil fuels to generate electricity and power our cars overloads the atmosphere with carbon dioxide, causing a dangerous atmospheric imbalance that’s raising global temperatures.

A report from the UN’s Intergovernmental Panel on Climate Change (IPCC) released earlier this month cautioned that the planet has just 12 years to dramatically curb greenhouse gas emissions, by overhauling our energy systems and economies and likely, our societies and political systems. Even a half degree rise beyond that would cause catastrophic sea level rises, droughts, heat, hunger, and poverty, spelling disaster for our species.

UK’s Commitment to Climate Change Mitigation

The UK government has committed to reducing carbon emissions by 80% of 1990 levels by 2050, a process that will involve overhauling our energy supply, which is responsible for 25% of greenhouse emissions in the country, just behind transport (26% of all emissions). But it may be too little too late. The government has already said it is reviewing these targets in light of the IPCC report and in the spring began consulting on a net-zero carbon emissions target for 2050.

But despite these dire prognoses and the enormity of the task facing us as a species, there’s reason to be optimistic. The UK has already managed to cut greenhouse gas emissions by 43% on 1990 levels, with much of the reduction coming from a 57% decline in emissions from energy generation. This is in part thanks to several providers offering you the chance to have a 100% renewable domestic energy supply.

Reduction in Coal Usage

The use of coal has plunged nearly overnight in the UK. In 2012, 42% of the UK’s electricity demand was met by coal. Just six years later, in the second quarter of 2018, that figure had fallen to just 1.6%. Emissions from coal-fired power stations fell from 129 million tonnes of CO2 to just 19 million tonnes over the same period.

A coal-free Britain is already on the horizon. In April 2017, the UK logged its first coal-free day since the Industrial Revolution; this past April we extended the run to 76 consecutive hours. In fact, in the second quarter of 2018, all the UK’s coal power stations were offline for a total of 812 hours, or 37% of the time. That’s more coal free hours than were recorded in 2016 and 2017 combined and in just three months.

When the UK does rely on coal power, it’s primarily to balance supplies and to meet demand overnight and during cold snaps, such as during the Beast from the East storm in March. The UK is so certain that coal is a technology of the past, that the government has plans to mothball all seven remaining coal-fired power stations by 2025.

Share of Renewables in Energy Supply

The decline in coal has been matched by an explosion in renewable energy, particularly in wind power. In the second quarter of 2018, renewables generated 31.7% of the UK’s electricity, up from under 9% in 2011. Of those, wind power produced 13.3% of all electricity (7.1% from onshore turbines farms and 6.2% from offshore wind farms), biomass energy contributed another 11% of the UK’s electricity, solar generated 6% and hydro power made up the rest of renewables’ pie share.

The UK’s total installed renewables capacity has exploded, hitting 42.2GW in the second quarter of 2018, up from under 10GW in 2010. That includes 13.7GW of onshore wind capacity and 7.8GW of offshore wind capacity—a figure which will get a boost with the opening in September of the world’s largest wind farm, the Walney Extension, off the coast of Cumbria, itself with a capacity of nearly 0.7GW. Solar panels contributed another 13GW of renewable capacity, and installed plant biomass infrastructure reaching 3.3GW.

However, while renewables are transforming electricity generation in the UK, our energy system consists of more than simply electricity. We also have to account for natural gas and the use of fuel in transport, and renewables have made fewer in roads in those sectors.

The UK is meeting just 9.3% of its total energy needs from renewable sources, short of the 15% it has earmarked for 2020 and far behind its peers in the EU, where Sweden is already running on 53.8% renewable energy.


Emissions are dropping overall in the UK, largely due to an ongoing revolution in electricity generation and a decisive move away from coal. But these reductions have concealed stagnant and even increasing levels of greenhouse gas emissions from other sectors, including transport and agriculture.

Our transition to a sustainable economy has begun but will require more than wind farms and the shuttering of coal-fired power stations. It must encompass electric vehicles, transformed industries, and ultimately changing attitudes toward energy and the environment and our responsibility toward it.

Looking for Cheap Business Electricity? Tips to Get the Best Tariffs

Every business person knows that making a profit from an enterprise is not easy. Reducing expenses is among the best ways to ensure profitability. However, it requires identification of all your costs and expenses. One area of concern for most businesses is the ever-rising cost of electricity. Indeed, cheap business electricity is a factor that can make or break your business. We guide you through some of the best techniques that’ll help you to get the best electricity tariffs for your business.

Compare the prices

The electricity sector has many suppliers. Each one of them is in it to make money. The competition is stiff, and so every supplier continually looks for the best ways to beat the competition.

Also, the tariffs differ among different industry players. Hence, you should endeavor to compare the prices among various suppliers. In case you get another provider with the best deal, it’s time to switch.

Know when your contract ends

When the electricity contract expires, and you are not aware, it can automatically renew because such a contract requires formal termination. The worst case scenario is where the contract rolls-over to higher prices. Knowing when your contract ends provides you with the perfect opportunity to switch suppliers.

Consider using a broker

The process of finding the electricity supplier with the most competitive tariffs is tedious and time-consuming. As a business owner you have many other essential engagements hence it would be better to use an electricity broker.

Brokers deeply understand electricity matters. They know all the suppliers and the tariffs they offer. They may also know the secrets of the trade that you might not be aware of. To crown it all,brokers in most cases will not charge you for their service as they get a fee from the electricity partner you choose.

Discuss with your supplier

When your contract ends, it provides you with a stellar opportunity for negotiating with your current supplier for tariff reduction. Most suppliers won’t want to lose you as their customer, and so they may be willing to listen to you.

Even where you have a quote from other electricity suppliers or also using a broker, it does cost you anything to try and negotiate with your current supplier. When you call them, let them know that you are considering switching if they do not lower the tariffs. Also, at the time of contract renewal, you get the opportunity to request for discounts.

Change Tariffs

Many people don’t even know their existing electricity plan. It is an excellent idea to look at your electricity bill or contract to discover your plan. Your tariff could be based on a flat-rate, or it could vary depending on the amount of usage.

It is also possible that your tariff depends on the time of usage. Selecting the best tariff can enable you to save a lot in electricity bills. Negotiating with your supplier for a customized tariff is another excellent strategy for reducing your business electricity.

Pyrolysis of Municipal Wastes

Pyrolysis-MSWPyrolysis is rapidly developing biomass thermal conversion technology and has been garnering much attention worldwide due to its high efficiency and good eco-friendly performance characteristics. Pyrolysis technology provides an opportunity for the conversion of municipal solid wastes, agricultural residues, scrap tires, non-recyclable plastics etc into clean energy. It offers an attractive way of converting urban wastes into products which can be effectively used for the production of heat, electricity and chemicals.

Pyrolysis of Municipal Wastes

Pyrolysis process consists of both simultaneous and successive reactions when carbon-rich organic material is heated in a non-reactive atmosphere. Simply speaking, pyrolysis is the thermal degradation of organic materials in the absence of oxygen. Thermal decomposition of organic components in the waste stream starts at 350°C–550°C and goes up to 700°C–800°C in the absence of air/oxygen.

Pyrolysis of municipal wastes begins with mechanical preparation and separation of glass, metals and inert materials prior to processing the remaining waste in a pyrolysis reactor. The commonly used pyrolysis reactors are rotary kilns, rotary hearth furnaces, and fluidized bed furnaces. The process requires an external heat source to maintain the high temperature required. Pyrolysis can be performed at relatively small-scale which may help in reducing transport and handling costs.  In pyrolysis of MSW, heat transfer is a critical area as the process is endothermic and sufficient heat transfer surface has to be provided to meet process heat requirements.

The main products obtained from pyrolysis of municipal wastes are a high calorific value gas (synthesis gas or syngas), a biofuel (bio oil or pyrolysis oil) and a solid residue (char). Depending on the final temperature, MSW pyrolysis will yield mainly solid residues at low temperatures, less than 4500C, when the heating rate is quite slow, and mainly gases at high temperatures, greater than 8000C, with rapid heating rates. At an intermediate temperature and under relatively high heating rates, the main product is a liquid fuel popularly known as bio oil.

Wide Range of Products

Bio oil is a dark brown liquid and can be upgraded to either engine fuel or through gasification processes to a syngas and then biodiesel. Pyrolysis oil may also be used as liquid fuel for diesel engines and gas turbines to generate electricity Bio oil is particularly attractive for co-firing because it can be relatively easy to handle and burn than solid fuel and is cheaper to transport and store. In addition, bio oil is also a vital source for a wide range of organic compounds and specialty chemicals.

Syngas is a mixture of energy-rich gases (combustible constituents include carbon monoxide, hydrogen, methane and a broad range of other VOCs). The net calorific value (NCV) of syngas is between 10 and 20MJ/Nm3. Syngas is cleaned to remove particulates, hydrocarbons, and soluble matter, and then combusted to generate electricity. Diesel engines, gas turbines, steam turbines and boilers can be used directly to generate electricity and heat in CHP systems using syngas and pyrolysis oil. Syngas may also be used as a basic chemical in petrochemical and refining industries.

The solid residue from MSW pyrolysis, called char, is a combination of non-combustible materials and carbon. Char is almost pure carbon and can be used in the manufacture of activated carbon filtration media (for water treatment applications) or as an agricultural soil amendment.

Why Going Green is the Best Thing You Can Do for Your Community

college-greenAs 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. These and a whole lot more are attainable by going green.

Savings on utility bills and other expenses

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 construction building 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.

Energy Potential of Palm Kernel Shells

palm-kernel-shellsThe Palm Oil industry in Southeast Asia and Africa generates large quantity of biomass wastes whose disposal is a challenging task. Palm kernel shells (or PKS) are the shell fractions left after the nut has been removed after crushing in the Palm Oil mill. Kernel shells are a fibrous material and can be easily handled in bulk directly from the product line to the end use. Large and small shell fractions are mixed with dust-like fractions and small fibres. Moisture content in kernel shells is low compared to other biomass residues with different sources suggesting values between 11% and 13%.

Palm kernel shells contain residues of Palm Oil, which accounts for its slightly higher heating value than average lignocellulosic biomass. Compared to other residues from the industry, it is a good quality biomass fuel with uniform size distribution, easy handling, easy crushing, and limited biological activity due to low moisture content. PKS can be readily co-fired with coal in grate fired -and fluidized bed boilers as well as cement kilns in order to diversify the fuel mix.

The primary use of palm kernel shells is as a boiler fuel supplementing the fibre which is used as primary fuel. In recent years kernel shells are sold as alternative fuel around the world. Besides selling shells in bulk, there are companies that produce fuel briquettes from shells which may include partial carbonisation of the material to improve the combustion characteristics. As a raw material for fuel briquettes, palm shells are reported to have the same calorific characteristics as coconut shells. The relatively smaller size makes it easier to carbonise for mass production, and its resulting palm shell charcoal can be pressed into a heat efficient biomass briquette.

Palm kernel shells have been traditionally used as solid fuels for steam boilers in palm oil mills across Southeast Asia. The steam generated is used to run turbines for electricity production. These two solid fuels alone are able to generate more than enough energy to meet the energy demands of a palm oil mill. Most palm oil mills in the region are self-sufficient in terms of energy by making use of kernel shells and mesocarp fibers in cogeneration. In recent years, the demand for palm kernel shells has increased considerably in Europe, Asia-Pacific, China etc resulting in price close to that of coal. Nowadays, cement industries and power producers are increasingly using palm kernel shells to replace coal. In grate-fired boiler systems, fluidized-bed boiler systems and cement kilns, palm kernel shells are an excellent fuel.

Cofiring of PKS yields added value for power plants and cement kilns, because the fuel significantly reduces carbon emissions – this added value can be expressed in the form of renewable energy certificates, carbon credits, etc. However, there is a great scope for introduction of high-efficiency cogeneration systems in the industry which will result in substantial supply of excess power to the public grid and supply of surplus PKS to other nations. Palm kernel shell is already extensively in demand domestically by local industries for meeting process heating requirements, thus creating supply shortages in the market.

Palm oil mills around the world may seize an opportunity to supply electricity for its surrounding plantation areas using palm kernel shells, empty fruit branches and palm oil mill effluent which have not been fully exploited yet. This new business will be beneficial for all parties, increase the profitability for palm oil industry, reduce greenhouse gas emissions and increase the electrification ratio in surrounding plantation regions.