Biomass Energy Scenario in ASEAN Countries

The rapid economic growth and industrialization in ASEAN region is characterized by a significant gap between energy supply and demand. The energy demand in the region is expected to grow rapidly in the coming years which will have a profound impact on the global energy market. In addition, the region has many locations with high population density, which makes public health vulnerable to the pollution caused by fossil fuels.

Another important rationale for transition from fossil-fuel-based energy systems to renewable ones arises out of observed and projected impacts of climate change. Due to the rising share of greenhouse gas emissions from Asia, it is imperative on all Asian countries to promote sustainable energy to significantly reduce GHGs emissions and foster sustainable energy trends. Rising proportion of greenhouse gas emissions is causing large-scale ecological degradation, particularly in coastal and forest ecosystems, which may further deteriorate environmental sustainability in the region.

The reliance on conventional energy sources can be substantially reduced as the region is one of the leading producers of biomass resources in the world. The energy generating capacity of biomass-based CHP plants is comparatively much higher than other alternative energy technologies like solar, wind and geothermal energy. In addition, solar and wind projects are confined to remote rural electrification and community centres, where the required installed capacity is low. On the other hand, thermal conversion-based cogeneration plants can generate higher capacities of electrical and heat energy that could benefit an entire township and industries in the immediate area.

Southeast Asia, with its abundant biomass resources, holds a strategic position in the global biomass energy atlas. There is immense potential of biomass energy in ASEAN countries due to plentiful supply of diverse forms of wastes such as agricultural residues, woody biomass, animal wastes, municipal solid waste, etc. ASEAN region is a big producer of wood and agricultural products which, when processed in industries, produces large amounts of biomass residues.

According to conservative estimates, the amount of biomass residues generated from sugar, rice and palm oil mills is more than 200-230 million tons per year which corresponds to cogeneration potential of 16-19 GW. Woody biomass is a good energy resource due to presence of large number of forests and wood processing industries in the region.

The prospects of biogas power generation are also high in the region due to the presence of well-established food-processing and dairy industries. Another important biomass resource is contributed by municipal solid wastes in heavily populated urban areas.  In addition, there are increasing efforts from the public and private sectors to develop biomass energy systems for efficient biofuel production, e.g. bio-diesel from palm oil. The rapid economic growth and industrialization in the region has accelerated the drive to implement the latest biomass energy technologies in order to tap the unharnessed potential of biomass resources, thereby making a significant contribution to the regional energy mix.

Bioenergy Developments in Malaysia

Malaysia is blessed with abundant renewable sources of energy, especially biomass and solar. Under the Eighth Malaysian Plan, renewable energy was added in the energy mix to unveil a Five-Fuel Strategy to achieve 5 percent contribution by 2005.

Among the various sources of renewable energy, bioenergy seems to be the most promising option for Malaysia. The National Biofuel Policy, launched in 2006 encourages the use of environmentally friendly, sustainable and viable sources of biomass energy. Under the Five Fuel Policy, the government of Malaysia has identified biomass as one of the potential renewable energy. Malaysia produces atleast 168 million tonnes of biomass, including timber and oil palm waste, rice husks, coconut trunk fibres, municipal waste and sugar cane waste annually. Being a major agricultural commodity producer in the region Malaysia is well positioned amongst the ASEAN countries to promote the use of biomass as a renewable energy source.

Malaysia has been one of the world’s largest producers and exporters of palm oil for the last forty years. The Palm Oil industry, besides producing Crude Palm Oil (CPO) and Palm Kernel Oil, produces Palm Shell, Press Fibre, Empty Fruit Bunches (EFB), Palm Oil Mill Effluent (POME), Palm Trunk (during replanting) and Palm Fronds (during pruning).

Malaysia has approximately 4 million hectares of land under oil palm plantation. Over 75% of total area planted is located in just four states, Sabah, Johor, Pahang and Sarawak, each of which has over half a million hectares under cultivation. The total amount of processed FFB (Fresh Fruit Bunches) was estimated to be 75 million tons while the total amount of EFB produced was estimated to be 16.6 million tons. Around 58 million tons of POME is produced in Malaysia annually, which has the potential to produce an estimated 15 billion m3 of biogas can be produced each year.

Malaysia is the world’s second largest producer of crude palm oil. Almost 70% of the volume from the processing of fresh fruit bunch is removed as wastes in the form of empty fruit bunches, palm kernel shells, palm oil mill effluent etc. With more than 423 mills in Malaysia, this palm oil industry generated around 80 million dry tonnes of biomass in 2010. Malaysia has more than 2400 MW of biomass and 410 MW of biogas potential, out of which only 773MW has been harnessed until 2011.

Rice husk is another important agricultural biomass resource in Malaysia with good potential for power cogeneration. An example of its attractive energy potential is biomass power plant in the state of Perlis which uses rice husk as the main source of fuel and generates 10 MW power to meet the requirements of 30,000 households. The US$15 million project has been undertaken by Bio-Renewable Power Sdn Bhd in collaboration with the Perlis state government, while technology provider is Finland’s Foster Wheeler Energia Oy.

Under the EC-ASEAN Cogeneration Program, there are three ongoing Full Scale Demonstration Projects (FSDPs) – Titi Serong, Sungai Dingin Palm Oil Mill and TSH Bioenergy – to promote biomass energy systems in Malaysia. The 1.5MW Titi Serong power plant, located at Parit Buntar (Perak), is based on rice husk while the 2MW Sungai Dingin Palm Oil Mill project make use of palm kernel shell and fibre to generate steam and electricity. The 14MW TSH Bioenergy Sdn Bhd, located at Tawau (Sabah), is the biggest biomass power plant in Malaysia and utilizes empty fruit bunches, palm oil fibre and palm kernel shell as fuel resources.

Carbon Market in the Middle East

green-middle-eastMiddle East is highly susceptible to climate change, on account of its water scarcity, high dependence on climate-sensitive agriculture, concentration of population and economic activity in urban coastal zones, and the presence of conflict-affected areas. Moreover, the region is one of the biggest contributors to greenhouse gas emissions on account of its thriving oil and gas industry.

The world’s dependence on Middle East energy resources has caused the region to have some of the largest carbon footprints per capita worldwide. Not surprisingly, the carbon emissions from UAE are approximately 55 tons per capita, which is more than double the US per capita footprint of 22 tons per year. The MENA region is now gearing up to meet the challenge of global warming, as with the rapid growth of the carbon market. During the last few years, many MENA countries, like UAE, Qatar, Egypt and Saudi Arabia have unveiled multi-billion dollar investment plans in the cleantech sector to portray a ‘green’ image.

There is an urgent need to foster sustainable energy systems, diversify energy sources, and implement energy efficiency measures. The clean development mechanism (CDM), under the Kyoto Protocol, is one of the most important tools to support renewable energy and energy efficiency initiatives in the MENA countries. Some MENA countries have already launched ambitious sustainable energy programs while others are beginning to recognize the need to adopt improved standards of energy efficiency.

The UAE, cognizant of its role as a major contributor to climate change, has launched several ambitious governmental initiatives aimed at reducing emissions by approximately 40 percent. Masdar, a $15 billion future energy company, will leverage the funds to produce a clean energy portfolio, which will then invest in clean energy technology across the Middle East and North African region. Egypt is the regional CDM leader with twelve projects in the UNFCCC pipeline and many more in the conceptualization phase.

Middle East is an attractive carbon market as it is rich in renewable energy resources and has a robust oil and gas industry. Surprisingly, very few CDM projects are taking place in MENA countries with only 22 CDM projects have been registered to date. The region accounts for only 1.5 percent of global CDM projects and only two percent of emission reduction credits. The two main challenges facing many of these projects are: weak capacity in most MENA countries for identifying, developing and implementing carbon finance projects and securing underlying finance. Currently, there are several CDM projects in progress in Egypt, Jordan, Bahrain, Morocco, Syria and Tunisia. Many companies and consulting firms have begun to explore this now fast-developing field.

The Al-Shaheen project is the first of its kind in the region and third CDM project in the petroleum industry worldwide. The Al-Shaheen oilfield has flared the associated gas since the oilfield began operations in 1994. Prior to the project activity, the facilities used 125 tons per day (tpd) of associated gas for power and heat generation, and the remaining 4,100 tpd was flared. Under the current project, total gas production after the completion of the project activity is 5,000 tpd with 2,800-3,400 tpd to be exported to Qatar Petroleum (QP); 680 tpd for on-site consumption, and only 900 tpd still to be flared. The project activity will reduce GHG emissions by approximately 2.5 million tCO2 per year and approximately 17 million tCO2 during the initial seven-year crediting period.

Potential CDM projects that can be implemented in the region may come from varied areas like sustainable energy, energy efficiency, waste management, landfill gas capture, industrial processes, biogas technology and carbon flaring. For example, the energy efficiency CDM projects in the oil and gas industry, can save millions of dollars and reduce tons of CO2 emissions. In addition, renewable energy, particularly solar and wind, holds great potential for the region, similar to biomass in Asia.

Renewable Energy Trends in Germany

Germany has been called “the world’s first major renewable energy economy” as the country is one of the world’s most prolific users of renewable energy for power, heating, and transport. Germany has rapidly expanded the use of clean energy which now contributes almost one-fourth to the national energy mix. Renewable energy contribute as much as one-fourth of the primary energy mix and the country has set a goal to producing 35 percent of electricity from renewable sources by 2020 and 100 percent by 2050.

Solar Energy

Germany is the world’s biggest solar market and largest PV installer with a solar PV capacity of more than 32.3 GW in December 2012. The German new solar PV installations increased by about 7.6 GW in 2012, with a record 1.3 million PV systems installed across the country. Germany has nearly as much installed solar power generation capacity as the rest of the world combined and gets about 5 percent of its overall annual electricity needs from solar power alone.

Wind Energy

Germany’s wind energy industry is one of the world’s largest, and it is at the forefront of technological development.  Over half of all wind turbines in Germany are owned by local residents, farmers and local authorities which have tremendously improved the acceptance of wind turbines among local communities as they directly profit.

Being Europe’s primary wind energy market, Germany represents around 30 percent of total installed capacity in Europe and 12 percent of global installed capacity. Total wind energy capacity in Germany was 31.32 GW at the end of year 2012. Currently Germany is ranked third worldwide in installed total wind capacity with its share of total domestic electricity production forecasted to reach 25 percent by 2025.

Biomass Energy

Biomass energy is making a significant contribution to renewable energy supply in Germany and accounts for about 5.5 percent of the total electricity production in the country. Germany is the market leader in biogas technology and is also Europe’s biggest biogas producer. Last year around 7,600 systems with a cumulative capacity of 3,200 MW generated 21.9 billion kWh in the country, thus consolidating Germany’s status as a pioneer in clean energy technologies.

Renewable Energy Investment

Germany’s plan to phase out all 17 of its nuclear power plants and shift to renewable energy by 2022 is the largest infrastructure investment program in Europe since World War II. The country’s transition from nuclear energy-based power network to renewable energy systems will require investments of much as $55 billion by 2030.

Germany is the world’s third largest market for renewable energy investment which totalled $31billion in 2011. Sixty-five percent of investment in Germany was directed toward solar, with 29 percent ($8.5 billion) directed to wind. In addition, 700 MW of biomass capacity was added in 2011

The country offers generous feed-in-tariffs for investors across all renewable energy segments which is attracting huge private capital in cleantech investments. In 2010, the majority ($29 billion) of cleantech investment came from corporate investors across all sectors of the economy, including farmers, energy utilities, and industrial and commercial enterprises.

In the first six months of 2012, the amount of electricity produced from renewable resource rose from 20% to 25%, bringing Germany closer to its targets of 35% by 2020 and 80% by 2050. According to figures released by the government agency Germany Trade and Invest, 38% of the electricity produced by renewable energy during that period was through wind power, and almost 16% from solar.

Solar Energy Prospects in Oman

Even the fleetest of glances at a map of worldwide solar energy levels shows Oman to be well placed to exploit the energy-giving rays of the sun. In fact, over the last few years, a gaggle of reports have been published extolling the virtues of exploiting this renewable energy source. However, with increasing and more urbanised populations consuming greater and greater amounts of energy, only now are governments across the Gulf and wider MENA regions seriously looking at harnessing solar power to help fill potential energy deficits.

Mr Jigar Shah, quoted in a recent article, said investors were “desperate to invest in the Middle East solar industry” and were waiting for clear instructions from the governments in the region. He said, “The economics of switching to solar energy are far better here than in South Africa, India, Brazil, China and the US. Now that the costs of developing solar technologies have significantly declined, it is time for the Middle East to turn talk into action.”

That there is huge potential in the solar industry was underlined in no uncertain terms by the announcement last year of a $2 billion project to develop solar energy power resources in Oman. The plans also envisage creating industrial plants for the manufacture of solar panels and aluminium frames, to be used by the power station and also for local consumption and export.

Knowledge and technology transfer were also critical contributors to the success of the project which also aimed to tie-up with major international technology companies and international universities with expertise in renewable energy education, to help train the local population in servicing this burgeoning industry.

David Heimhofer, Chairman of Terra Nex Group and Managing Director of Middle East Best Select Fund, said, “By attracting foreign direct investment in the growing renewable energy sector and using German expertise, Oman will become not just a regional leader in the field, but also benefit from the great intrinsic value within the complete value chain associated with this economic sector. He says“In addition to generating new jobs for the Omani people and boosting exports, this project creates an entire industry that Oman can be proud of.”

The project is expected to deliver more than 2000 jobs for Omanis across a diverse range of industrial sectors and services. In order to increase the skill set of the local population to help service these new jobs, the University of Zurich proposed the setting up of an educational institution in the Sultanate specialising in the field of renewable energy engineering.

Biogas Sector in India: Perspectives

Biogas is an often overlooked and neglected aspect of renewable energy in India. While solar, wind and hydropower dominate the discussion in the cuntry, they are not the only options available. Biogas is a lesser known but highly important option to foster sustainable development in agriculture-based economies, such as India.

What is Biogas

Briefly speaking, biogas is the production of gaseous fuel, usually methane, by fermentation of organic material. It is an anaerobic process or one that takes place in the absence of oxygen. Technically, the yeast that causes your bread to rise or the alcohol in beer to ferment is a form of biogas. We don’t use it in the same way that we would use other renewable sources, but the idea is similar. Biogas can be used for cooking, lighting, heating, power generation and much more. Infact, biogas is an excellent and effective to promote development of rural and marginalized communities in all developing countries.

This presents a problem, however. The organic matter is putting off a gas, and to use it, we have to turn it into a liquid. This requires work, machinery and manpower. Research is still being done to figure out the most efficient methods to make it work, but there is a great deal of progress that has been made, and the technology is no longer new.

Fossil Fuel Importation

India has a rapidly expanding economy and the population to fit. This has created problems with electricity supplies to expanding areas. Like most countries, India mainly uses fossil fuels. However, as oil prices fluctuate and the country’s demand for oil grows, the supply doesn’t always keep up with the demand. In the past, India has primarily imported oil from the Middle East, specifically Saudi Arabia and Iraq.

Without a steady and sustainable fossil fuels supply, India has looking more seriously into renewable sources they can produce within the country. Biogas is an excellent candidate to meet those requirements and has been used for this goal before.

Biogas in India

There are significant differences between biogas and fossil fuels, but for India, one of the biggest is that you can create biogas at home. It’s pretty tricky to find, dig up and transform crude oil into gas, but biogas doesn’t have the same barriers. In fact, many farmers who those who have gardens or greenhouses could benefit with proper water management and temperature control so that plants can be grown year round, It still takes some learning and investment, but for many people, especially those who live in rural places, it’s doable.

This would be the most beneficial to people in India because it would help ease the strain of delivering reliable energy sources based on fossil fuels, and would allow the country to become more energy independent. Plus, the rural areas are places where the raw materials for biogas will be more available, such animal manure, crop residues and poultry litter. But this isn’t the first time most people there are hearing about it.

Biogas in India has been around for a long time. In the 1970’s the country began a program called the National Biogas and Manure Management Program (NBMMP) to deal with the same problem — a gas shortage. The country did a great deal of research and implemented a wide variety of ideas to help their people become more self-sufficient, regardless of the availability of traditional gasoline and other fossil fuel based products.

The original program was pioneering for its time, but the Chinese quickly followed suit and have been able to top the market in biogas production in relatively little time. Comparatively, India’s production of biogas is quite small. It only produces about 2.07 billion m3/year of biogas, while it’s estimated that it could produce as much as 48 billion m3/year. This means that there are various issues with the current method’s India is using in its biogas production.


Biogas has the potential to rejuvenate India’s agricultural sector

The original planning in the NBMMP involved scientists who tried to create the most efficient biogas generators. This was good, but it slowed people’s abilities to adopt the techniques individually. China, on the other hand, explicitly worked to help their most rural areas create biogas. This allowed the country to spread the development of biogas to the most people with the lowest barriers to its proliferation.

If India can learn from the strategy that China has employed, they may be able to give their biogas production a significant boost which will also help in the rejuvenation of biomass sector in the country. Doing so will require the help and willingness of both the people and the government. Either way, this is an industry with a lot of room for growth.

How to Reduce HVAC Energy Consumption at Home and Cut Your Power Bill

Heating and cooling account for more than 50% of home energy consumption. If you are paying a lot in the name of energy bills, your HVAC system is most likely the primary cause. It is vital to cut down on the energy consumption of utilities to save money (and energy). Energy companies such as American Power and Gas, suggest consumers and homeowners pay special attention to their HVAC system. as heating and cooling cost make up about 40% of your energy bills.

It may also be wise to consider switching to a system that operates on solar or other forms of renewable energy––Providing if it can be afforded.

Here are some ways you can reduce HVAC energy consumption:

Programmable Thermostat to The Rescue

HVAC units can be made to consume less energy with the help of programmable thermostats.

The DOE recommends reducing room temperature to 15 degrees in winters when you are not home for 8-10 hours. Similarly, they suggest increasing the temperature by around 15 degrees in summers when you are not going to be home for half the day. This will help you save about 15% more energy annually.

The benefit that programmable thermostat gives you is that you won’t have to manually adjust the temperature every day. You can simply program it to change the temperature and save energy. It also has the added plus of operating on a timer so you don’t have to worry about leaving it on throughout the day.

Maintain The Coils Of Your AC Unit

The outdoor unit of the AC can allow dirt and debris to pass through it and gather around the coils and reduce the efficiency of the AC, as a result the unit consumes more energy to keep the room cool.

Keep your outdoor unit clean from dirt, fallen leaves, and other debris to make it work perfectly. If you believe that your outdoor unit needs cleaning, shut it off and use a vacuum to pull out all the dirt.

Inspect Air Filters 

Air filters need special attention as they can get blocked due to dirt and debris. They need to be replaced every season as damaged filters put extra pressure on the unit causing energy to be wasted.

Other than this, you should also replace the filters every now and then. This is not a very tough job and you can do it on your own.

Here’s how to do it:

  • Remove the filter and check for debris stuck in the filters.
  • Keep the filters under light to see if it’s able to pass through. If it doesn’t then you will have to wash the filters.
  • Clean the filters with a toothbrush, or another such tool first.
  • Put the filters in soapy water for a few hours, dry and see if the light passes again. If it does then you can re-apply those, otherwise, you may have to change the air filters.

The average life expectancy of air filters is about 2 to 3 months if they aren’t maintained. Otherwise, they can easily run for a year.

Out With The Old, In With The New

HVAC systems can be costly but if you have been using one for more than 10 years now then it’s time to replace it with a modern and an energy efficient HVAC system.

AC Coils of HVAC systems require regular cleanup

A Clean Way to Cool Down

You can also consult with your energy provider regarding making the switch to renewable energy services. You can also look into energy storage systems such as Tesla’s solar panels that can drastically cut your power bill and provide clean sustainable energy for your home.

The Verdict

Around 48% of US home energy consumption is directly attributable to HVAC use and heating or cooling. These are some of the most efficient ways which you can reduce the amount of energy consumed by your HVAC system.

Sustainable Environment in Singapore: An Attraction for Businesses and Investors

In addition to a robust economy, Singapore’s sustainable environment is another leading factor that has attracted numerous investors. Most cities in the world have failed to address environmental issues brought about by urbanization. Towns or urban areas cover over 2% of the Earth’s surface; they are responsible for about 80% of the greenhouse gases emitted while using up almost 75%  of nature’s resources.

However, a host of countries in Southeast Asia are leading the way to change this contrary notion about cities and urban regions. Research conducted by several world-leading environmental bodies and institutions determined that Singapore is indeed one of the most environmentally sustainable nations.

Singapore’s first prime minister kickstarted the dream of making Singapore a green city. His main agenda was to make Singapore stand out from the rest of the Asian countries and also attract investors from all over the world. The first step undertaken to achieve this dream was the eradication of the houseboats and overcrowded slums along the banks of Singapore River.

Incorporation services Singapore are offering entrepreneurs moving to Singapore a platform to incorporate their businesses in Singapore. This allows them to run their firms within the stipulated terms while also receive the government’s backing.

On the world’s Environmental Performance Ranking, Yale University and the U.N place Singapore at seventeenth globally and first position in Asia. Contrary to popular belief, Singapore’s efforts and strict green technology guidelines, which were set and backed up by the government, helped in making it an eco-friendly city.  

So how exactly does Singapore afford to provide suitable surroundings perfect for its citizens and also attract investors and entrepreneurs from overseas?

Government Support

As discussed before, adoption of green technology is one of the leading things that has made Singapore an eco-friendly city. Singapore has been able to morph into a modernized city-state without having a negative impact on nature.

The Singapore government’s Cleantech division, which is a subsidiary of the board tasked with economic growth, has offered continued support to companies in the clean technology business. This has led to the business sector growing tremendously in areas such as renewable energy, water conservation, green buildings, etc.

Growing ICT Center

Companies such as Hewlett Packard (HP) and International Business Machines Corporation have partnered with the Ministry of Environment and Water Resources. The main idea behind these partnerships is to ensure that Singapore’s ICT industry thrives. HP, for example, has been tasked with designing and manufacturing energy efficient systems that will cut power costs while still providing a working platform for businesses.

There is no shortage of green spaces in Singapore

Low Energy Costs and Environmental Remedies

Accommodating over 7000 companies from different nations across the globe is no mean feat. As such, Singapore’s government and other agencies know that a green environment is not the only requirement to attract more investors.

Through an alliance known as the Singapore Sustainability Alliance, an umbrella consisting of government groups, non-governmental organizations, and teaching institutions, Singapore has been able to come up with policies that create a sustainable environment. Other than this, the alliance has overseen the adoption of systems that include proper water use, renewable energy, energy efficiency, waste management, etc. which have significantly improved business growth.  

Renewable Energy from Food Residuals

Food residuals are an untapped renewable energy source that mostly ends up rotting in landfills, thereby releasing greenhouse gases into the atmosphere. Food residuals are difficult to treat or recycle since it contains high levels of sodium salt and moisture, and is mixed with other waste during collection. Major generators of food wastes include hotels, restaurants, supermarkets, residential blocks, cafeterias, airline caterers, food processing industries, etc.

In United States, food scraps is the third largest waste stream after paper and yard waste. Around 12.7 percent of the total municipal solid waste (MSW) generated in the year 2008 was food scraps that amounted to about 32 million tons. According to EPA, about 31 million tons of food waste was thrown away into landfills or incinerators in 2008. As far as United Kingdom is concerned, households throw away 8.3 million tons of food each year. These statistics are an indication of tremendous amount of food waste generated all over the world.

The proportion of food residuals in municipal waste stream is gradually increasing and hence a proper food waste management strategy needs to be devised to ensure its eco-friendly and sustainable disposal. Currently, only about 3 percent of food waste is recycled throughout U.S., mainly through composting. Composting provides an alternative to landfill disposal of food waste, however it requires large areas of land, produces volatile organic compounds and consumes energy. Consequently, there is an urgent need to explore better recycling alternatives.

Anaerobic digestion has been successfully used in several European and Asian countries to stabilize food wastes, and to provide beneficial end-products. Sweden, Austria, Denmark, Germany and England have led the way in developing new advanced biogas technologies and setting up new projects for conversion of food waste into energy.

Anaerobic Digestion of Food Waste

Anaerobic digestion is the most important method for the treatment of organic waste, such as food residuals, because of its techno-economic viability and environmental sustainability. The use of anaerobic digestion technology generates biogas and preserves the nutrients which are recycled back to the agricultural land in the form of slurry or solid fertilizer.

The relevance of biogas technology lies in the fact that it makes the best possible use of various organic wastes as a renewable source of clean energy. A biogas plant is a decentralized energy system, which can lead to self-sufficiency in heat and power needs, and at the same time reduces environmental pollution. Thus, anaerobic digestion of food waste can lead to climate change mitigation, economic benefits and landfill diversion opportunities.

Of the different types of organic wastes available, food waste holds the highest potential in terms of economic exploitation as it contains high amount of carbon and can be efficiently converted into biogas and organic fertilizer. Food waste can either be used as a single substrate in a biogas plant, or can be co-digested with organic wastes like cow manure, poultry litter, sewage, crop residues, slaughterhouse wastes, etc.

A Typical Energy Conversion Plant

The feedstock for the food waste-to-energy plant includes leftover food, vegetable refuse, stale cooked and uncooked food, meat, teabags, napkins, extracted tea powder, milk products, etc. Raw waste is shredded to reduce to its particle size to less than 12 mm. The primary aim of shredding is to produce a uniform feed and reduce plant “down-time” due to pipe blockages by large food particles. It also improves mechanical action and digestibility and enables easy removal of any plastic bags or cling-film from waste.

Fresh waste and re-circulated digestate (or digested food waste) are mixed in a mixing tank. The digestate is added to adjust the solids content of the incoming waste stream from 20 to 25 percent (in the incoming waste) to the desired solids content of the waste stream entering the digestion system (10 to 12 percent total solids). The homogenized waste stream is pumped into the feeding tank, from which the anaerobic digestion system is continuously fed. Feeding tank also acts as a pre-digester and subjected to heat at 55º to 60º C to eliminate pathogens and to facilitate the growth of thermophilic microbes for faster degradation of waste.

From the predigestor tank, the slurry enters the main digester where it undergoes anaerobic degradation by a consortium of Archaebacteria belonging to Methanococcus group. The anaerobic digester is a CSTR reactor having average retention time of 15 to 20 days. The digester is operated in the mesophilic temperature range (33º to 38°C), with heating carried out within the digester. Food waste is highly biodegradable and has much higher volatile solids destruction rate (86 to 90 percent) than biosolids or livestock manure. As per conservative estimates, each ton of food waste produces 150 to 200 m3 of biogas, depending on reactor design, process conditions, waste composition, etc.

Biogas contains significant amount of hydrogen sulfide (H2S) gas that needs to be stripped off due to its corrosive nature. The removal of H2S takes place in a biological desulphurization unit in which a limited quantity of air is added to biogas in the presence of specialized aerobic bacteria that oxidizes H2S into elemental sulfur. The biogas produced as a result of anaerobic digestion of waste is sent to a gas holder for temporary storage. Biogas is eventually used in a combined heat and power (CHP) unit for its conversion into thermal and electrical energy in a co­generation power station of suitable capacity. The exhaust gases from the CHP unit are used for meeting process heat requirements.

The digested substrate leaving the reactor is rich in nutrients like nitrogen, potassium and phosphorus which are beneficial for plants as well as soil. The digested slurry is dewatered in a series of screw presses to remove the moisture from slurry. Solar drying and additives are used to enhance the market value and handling characteristics of the fertilizer.

Diverting Food from Landfills

Food residuals are one of the single largest constituents of municipal solid waste stream. Diversion of food waste from landfills can provide significant contribution towards climate change mitigation, apart from generating revenues and creating employment opportunities. Rising energy prices and increasing environmental pollution makes it more important to harness renewable energy from food scraps.

Anaerobic digestion technology is widely available worldwide and successful projects are already in place in several European as well as Asian countries that makes it imperative on waste generators and environmental agencies to root for a sustainable food waste management system.

Bagasse-Based Cogeneration in Pakistan: Challenges and Opportunities

Considering the fact that Pakistan is among the world’s top-10 sugarcane producers, the potential of generating electricity from bagasse is huge.  Almost all the sugar mills in Pakistan have in-house plants for cogeneration but they are inefficient in the consumption of bagasse. If instead, high pressure boilers are installed then the production capacity can be significantly improved with more efficient utilization of bagasse.

However, due to several reasons; mostly due to financing issues, the sugar mill owners were not able to set up these plants. Only recently, after financial incentives have been offered and a tariff rate agreed upon between the government and mill owners, are these projects moving ahead.

The sugar mill owners are more than willing to supply excess electricity generated form the in-house power plants to the national grid but were not able to before, because they couldn’t reach an agreement with the government over tariff. The demand for higher tariff was justified because of large investments in setting up new boilers. It would also have saved precious foreign exchange which is spent on imported oil.

By estimating the CDM potential of cogeneration (or CHP) projects based on biofuels, getting financing for these projects would be easier. Renewable energy projects can be developed through Carbon Development Mechanism or any other carbon credit scheme for additional revenue.

Since bagasse is a clean fuel which emits very little carbon emissions it can be financed through Carbon Development Mechanism. One of the reasons high cogeneration power plants are difficult to implement is because of the high amount of costs associated. The payback period for the power plants is unknown which makes the investors reluctant to invest in the high cogeneration project. CDM financing can help improve the rate of return of the project.

Bagasse power plants generate Carbon Emission Reductions in 2 ways; one by replacing electricity produced from fossil fuels.  Secondly if not used as a fuel, it would be otherwise disposed off in an unsafe manner and the methane emissions present in biomass would pollute the environment far more than CO2 does.

Currently there are around 83 sugar mills in Pakistan producing about 3.5 million metric tons of sugar per annum with total crushing capacity 597900 TCD, which can produce approximately 3000 MW during crop season Although it may seem far-fetched at the moment, if the government starts to give more attention to  sugar industry biomass rather than coal, Pakistan can fulfill its energy needs without negative repercussions or damage to the environment.

However some sugar mills are opting to use coal as a secondary fuel since the crushing period of sugarcane lasts only 4 months in Pakistan. The plants would be using coal as the main fuel during the non-crushing season. The CDM effect is reduced with the use of coal. If a high cogeneration plant is using even 80% bagasse and 20% of coal then the CERs are almost nullified. If more than 20% coal is used then the CDM potential is completely lost because the emissions are increased. However some sugar mills are not moving ahead with coal as a secondary fuel because separate tariff rates have to be obtained for electricity generation if coal is being used in the mix which is not easily obtained.

Pakistan has huge untapped potential for bagasse-based power generation

One of the incentives being offered by the State Bank of Pakistan is that if a project qualifies as a renewable project it is eligible to get loan at 6% instead of 12%. However ones drawback is that, in order to qualify as a renewable project, CDM registration of a project is not taken into account.

Although Pakistan is on the right track by setting up high cogeneration power plants, the use of coal as a secondary fuel remains debatable.  The issue that remains to be addressed is that with such huge amounts of investment on these plants, how to use these plants efficiently during non-crushing period when bagasse is not available. It seems almost counter-productive to use coal on plants which are supposed to be based on biofuels.


With the demand for energy in Pakistan growing, the country is finally exploring alternatives to expand its power production. Pakistan has to rely largely on fossils for their energy needs since electricity generation from biomass energy sources is considered to be an expensive option despite abundance of natural resources. However by focusing on growing its alternate energy options such as bagasse-based cogeneration, the country will not only mitigate climate change but also tap the unharnessed energy potential of sugar industry biomass.