Sugar industry has always occupied a prominent position in the Mauritian economy since the introduction of sugarcane around three centuries ago. Mauritius has been a world pioneer in establishing sales of bagasse-based energy to the public grid, and is currently viewed as a model for other sugarcane producing countries, especially the developing ones.
Sugar factories in Mauritius produce about 600,000 tons of sugar from around 5.8 million tons of sugarcane which is cultivated on an agricultural area of about 72,000 hectares. Of the total sugarcane production, around 35 percent is contributed by nearly 30,000 small growers. There are more than 11 sugar factories presently operating in Mauritius having crushing capacities ranging from 75 to 310 tons cane per hour.
During the sugar extraction process, about 1.8 million tons of Bagasse is produced as a by-product, or about one third of the sugarcane weight. Traditionally, 50 percent of the dry matter is harvested as cane stalk to recover the sugar with the fibrous fraction, i.e. Bagasse being burned to power the process in cogeneration plant. Most factories in Mauritius have been upgraded and now export electricity to the grid during crop season, with some using coal to extend production during the intercrop season.
Surplus electricity is generated in almost all the sugar mills. The total installed capacity within the sugar industry is 243 MW out of which 140 MW is from firm power producers. Around 1.6 – 1.8 million tons of bagasse (wet basis) is generated on an annually renewable basis and an average of around 60 kWh per ton sugarcane is generated for the grid throughout the island.
The surplus exportable electricity in Mauritian power plants has been based on a fibre content ranging from 13- 16% of sugarcane, 48% moisture content in Bagasse, process steam consumption of 350–450 kg steam per ton sugarcane and a power consumption of 27-32 kWh per ton sugarcane.
In Mauritius, the sugarcane industry is gradually increasing its competitiveness in electricity generation. It has revamped its boiler houses by installing high pressure boilers and condensing extraction steam turbine. All the power plants are privately owned, and the programme has been a landmark to show how all the stakeholders (government, corporate and small planters) can co-operate. The approach is being recommended to other sugarcane producing countries worldwide to harness the untapped renewable energy potential of biomass wastes from the sugar industry.
Biomass gasification involves burning of biomass in a limited supply of air to give a combustible gas consisting of carbon monoxide, carbon dioxide, hydrogen, methane, water, nitrogen, along with contaminants like small char particles, ash and tars. The gas is cleaned to make it suitable for use in boilers, engines and turbines to produce heat and power (CHP).
Biomass gasification provides a means of deriving more diverse forms of energy from the thermochemical conversion of biomass than conventional combustion. The basic gasification process involves devolatization, combustion and reduction.
During devolatization, methane and other hydrocarbons are produced from the biomass by the action of heat which leaves a reactive char.
During combustion, the volatiles and char are partially burned in air or oxygen to generate heat and carbon dioxide. In the reduction phase, carbon dioxide absorbs heat and reacts with the remaining char to produce carbon monoxide (producer gas). The presence of water vapour in a gasifier results in the production of hydrogen as a secondary fuel component.
There are two main types of gasifier that can be used to carry out this conversion, fixed bed gasifiers and fluidized bed gasifiers. The conversion of biomass into a combustible gas involves a two-stage process. The first, which is called pyrolysis, takes place below 600°C, when volatile components contained within the biomass are released. These may include organic compounds, hydrogen, carbon monoxide, tars and water vapour.
Pyrolysis leaves a solid residue called char. In the second stage of the gasification process, this char is reacted with steam or burnt in a restricted quantity of air or oxygen to produce further combustible gas. Depending on the precise design of gasifier chosen, the product gas may have a heating value of 6 – 19 MJ/Nm3.
Layout of a Typical Biomass Gasification Plant
The products of gasification are a mixture of carbon monoxide, carbon dioxide, methane, hydrogen and various hydrocarbons, which can then be used directly in gas turbines, and boilers, or used as precursors for synthesising a wide range of other chemicals.
In addition there are a number of methods that can be used to produce higher quality product gases, including indirect heating, oxygen blowing, and pressurisation. After appropriate treatment, the resulting gases can be burned directly for cooking or heat supply, or used in secondary conversion devices, such as internal combustion engines or gas turbines, for producing electricity or shaft power (where it also has the potential for CHP applications).
China has recently emerged as one of the economic powerhouses of the world. Not only does this status continue to redefine what was considered to represent a somewhat “backwards” society, but plenty of employment opportunities await. This has also given rise to several interesting trends. From the growing number of Chinese classes online which cater to foreign migrants to increased international investment, the future does indeed look bright.
It is also important to mention how China has begun to capitalise upon innovative solutions in the hopes of reducing the impacts of climate change. One interesting example can be seen in the use of bioenergy as a viable substitute for traditional fossil fuels. What are some current trends to note and are there any challenges that will need to be addressed in the coming years?
Promising Statistics
Many readers will be surprised to learn that up to 80 per cent of raw biomass materials are now being used to generate power throughout China. Considering the population of this nation, it only stands to reason that such sources of energy abound. Furthermore, the implementation of biomass will help to reduce China’s reliance upon outside nations. This provides a much-needed economic boost and promises an impressive long-term return on investment (ROI).
Such a pronounced trend is at least partially due to a younger Chinese generation that has now become well aware of their role in stemming the effects of climate change. Another undeniable benefit is the simple fact that bioenergy now represents a niche employment sector; providing plenty of opportunities for those with the appropriate skill sets.
What Challenges Await?
While all of the observations outlined above are rather promising, we also need to remember that there are some downsides attributed to biomass in relation to energy production. One potential issue involves industry competition as well as to decide how the resources themselves should be allocated. Wealth distribution could also come into play considering the role that corruption may play in terms of profit margins.
As this summary highlights, another possible sticking point could instead involve operational challenges including:
Other problems such as retooling existing factories in order to support biomass energy production can be rather complicated and expensive.
So, what might the future of bioenergy in China have in store? Most experts agree that relying upon fossil fuels alone as a source of electricity is no longer a viable option. So, it stands to reason that the Chinese government is looking carefully at how biomass can be used as an alternative. Officials also appreciate that many other nations have already curtailed their use of fuels such as coal and natural gas.
The main takeaway point here is that much like any other emerging industry, bioenergy is associated with undeniable advantages as well as some logistical challenges. Still, China should be able to rise to the occasion with planning and foresight.
Transporting biomass fuel to a power plant is an important aspect of any biomass energy project. Because a number of low moisture fuels can be readily collected and transported to a centralized biomass plant location or aggregated to enhance project size, this opportunity should be evaluated on a case-by-case basis.
It will be a good proposition to develop biomass energy plants at the location where the bulk of the agricultural waste stream is generated, without bearing the additional cost of transporting waste streams. Effective capture and use of thermal energy at the site for hot water, steam, and even chilled water requirements raises the energy efficiency of the project, thereby improving the value of the waste-to-energy project.
Important Factors
The maximum rate of biomass supply to the conversion facility.
The form and bulk density of biomass.
The hauling distance for biomass transportation to the processing plant.
Transportation infrastructure available between the points of biomass dispatch and processing plant
Transportation is primarily concerned with loading and unloading operation and transferring biomass from pre-processing sites to the main processing plant or biorefinery. Truck transport and for a few cases train transport may be the only modes of transport. Barge and pipeline transport and often train transport involve truck transport. Trucks interface with trains at loading and unloading facilities of a depot or processing facility. Barge and pipeline require interfacing with train and/or truck transport at major facilities either on land or at the shores.
Physical form and quality of biomass has the greatest influence on the selection of handling equipment for the lowest delivered cost possible. A higher bulk density will allow more mass of material to be transported per unit distance. Truck transport is generally well developed, is usually cheapest mode of transport but it becomes expensive as travel distance increases. Pipeline biomass transport is the least known technology and may prove to be the cheapest and safest mode of transport in the near future.
Transportation costs of low-density and high-moisture agricultural residues are a major constraint to their use as an energy source. As a rule of thumb, transportation distances beyond a 25–50- km radius (depending on local infrastructure) are uneconomical. For long distances, agricultural residues could be compressed as bales or briquettes in the field, rendering transport to the site of use a viable option.
Greater use of biomass and larger scale conversion systems demand larger scale feedstock handling and delivery infrastructure. To accommodate expansion in feedstock collection and transportation, production centres can be established where smaller quantities of biomass are consolidated, stored, and transferred to long-distance transportation systems, in much the same way that transfer stations are used in municipal waste handling. Preprocessing equipment may be used to densify biomass, increasing truck payloads and reducing transportation costs over longer haul distances.
The term agricultural residue is used to describe all the organic materials which are produced as by-products from harvesting and processing of agricultural crops. These residues can be further categorized into primary residues and secondary residues.
Agricultural residues, which are generated in the field at the time of harvest, are defined as primary or field based residues whereas those co-produced during processing are called secondary or processing based residues.
Primary agricultural residues – paddy straw, sugarcane top, maize stalks, coconut empty bunches and frond, palm oil frond and bunches;
Agricultural residues are highly important sources of biomass fuels for both the domestic and industrial sectors. Availability of primary residues for energy application is usually low since collection is difficult and they have other uses as fertilizer, animal feed etc.
However secondary residues are usually available in relatively large quantities at the processing site and may be used as captive energy source for the same processing plant involving minimal transportation and handling cost.
Crop residues encompasses all agricultural wastes such as straw, stem, stalk, leaves, husk, shell, peel, pulp, stubble, etc. which come from cereals (rice, wheat, maize or corn, sorghum, barley, millet), cotton, groundnut, jute, legumes (tomato, bean, soy) coffee, cacao, tea, fruits (banana, mango, coco, cashew) and palm oil.
Rice produces both straw and rice husks at the processing plant which can be conveniently and easily converted into energy. Significant quantities of biomass remain in the fields in the form of cob when maize is harvested which can be converted into energy.
Storage of biomass fuels is expensive and increases with capacity.
Sugarcane harvesting leads to harvest residues in the fields while processing produces fibrous bagasse, both of which are good sources of energy. Harvesting and processing of coconuts produces quantities of shell and fibre that can be utilised while peanuts leave shells. All these materials can be converted into useful energy by a wide range of biomass conversion technologies.
Biomass is one of the oldest and simplest ways of getting heat and energy, and it’s starting to make a comeback due to its status as renewable resource. Some, however, aren’t so sure that using more of it would be good for our environment. So, how sustainable is biomass energy really?
What is Biomass?
Biomass is organic material from plants and animals. It naturally contains energy because plants absorb it from the sun through photosynthesis. When you burn biomass, it releases that energy. It’s also sometimes converted into a liquid or gas form before it is burned.
Biomass includes a wide variety of materials but includes:
About five percent of the United States’ energy comes from biomass. Biomass fuel products such as ethanol make up about 48 percent of that five percent while wood makes up about 41 percent and municipal waste accounts for around 11 percent.
The Benefits of Biomass
Biomass is a renewable resource because the plants that store the energy released when it is burned can be regrown continuously. In theory, if you planted the same amount of vegetation that you burned, it would be carbon neutral because the plants would absorb all of the carbon released. Doing this is, however, much easier said than done.
Another potential is that it serves as a use for waste materials that have are already been created. It adds value to what otherwise would be purely waste.
While you can replenish the organic matter you burn, doing so requires complex crop or forest management and the use of a large amount of land. Also, some biomass, such as wood, takes a long time to grow back. This amounts to a delay in carbon absorption. Additionally, the harvesting of biomass will likely involve some sort of emissions.
Is it Sustainable?
So, is biomass energy sustainable? Measuring the environmental impacts of biomass fuel use has proven to be complex due to the high number of variables, which has led to a lot of disagreement about this question.
Some assert that biomass use cannot be carbon neutral, because even if you burned and planted the same amount of organic matter, harvesting it would still result in some emissions. This could perhaps be avoided if you used renewable energy to harvest it. A continuous supply of biomass would likely require it to be transported long distances, worsening the challenge of going carbon neutral.
With careful planning, responsible land management and environmentally friendly harvesting and distribution, biomass could be close to, if not entirely, carbon neutral and sustainable. Given our reliance on fossil fuels, high energy consumption levels and the limited availability of land and other resources, this would be an immense challenge to undertake and require a complete overhaul of our energy use.
Source locally: Using biomass that comes from the local area reduces the impact of distributing it.
Clean distribution: If you do transport biofuel long distances, using an electric or hybrid vehicles powered largely by clean energy would be the most eco-friendly way to do it. This also applies to transporting it short distances.
Measuring the environmental impacts of biomass fuel use is complex due to high number of variables
Clean harvesting: Using environmentally friendly, non-emitting means of harvesting can greatly reduce the impact of using biomass. This might also involve electric vehicles.
Manage land sustainably: For biomass to be healthy for the ecosystem, you must manage land used to grow it with responsible farming practices.
Focus on waste: Waste is likely the most environmentally friendly form of biomass because it uses materials that would otherwise simply decompose and doesn’t require you to grow any new resources for your fuel or energy needs.
Is biomass energy sustainable? It has the potential to be, but doing so would be quite complex and require quite a bit of resources. Any easier way to address the problem is to look at small areas of land and portions of energy use first. First, make that sustainable and then we may be able to expand that model on to a broader scale.
Bioenergy projects are plagued by several problems. This article makes an attempt at collating some of the most prominent issues associated with biomass technologies and provides plausible solutions in order to seek further promotion of biomass energy technologies. The solutions provided below are based on author’s understanding and experience in this field.
Here are the top issues in biomass energy projects around the world:
1. Large Project Costs
The project costs are to a great extent comparable to these technologies which actually justify the cause. Also, people tend to ignore the fact, that most of these plants, if run at maximum capacity could generate a Plant Load Factor (PLF) of 80% and above. This figure is about 2-3 times higher than what its counterparts wind and solar energy based power plants could provide. This however, comes at a cost – higher operational costs.
2. Lower Efficiency of Biomass Technologies
The solution to this problem, calls for innovativeness in the employment of these technologies. To give an example, one of the paper mill owners in India, had a brilliant idea to utilize his industrial waste to generate power and recover the waste heat to produce steam for his boilers. The power generated was way more than he required for captive utilization. With the rest, he melts scrap metal in an arc and generates additional revenue by selling it.
Although such solutions are not possible in each case, one needs to possess the acumen to look around and innovate – the best means to improve the productivity with regards to these technologies.
3. Immature Technologies
One needs to look beyond what is directly visible. There is a humongous scope of employment of these biomass technologies for decentralized power generation. With regards to scale, few companies have already begun conceptualizing ultra-mega scale power plants based on biomass resources. Power developers and critics need to take a leaf out of these experiences.
4. Lack of Funding Options
The most essential aspect of any biomass energy project is the resource assessment. Investors if approached with a reliable resource assessment report could help regain their interest in such projects. Moreover, the project developers also need to look into community based ownership models, which have proven to be a great success, especially in rural areas.
The project developer needs to not only assess the resource availability but also its alternative utilization means. It has been observed that if a project is designed by considering only 10-12% of the actual biomass to be available for power generation, it sustains without any hurdles.
5. Non-Transparent Trade Markets
Most countries still lack a common platform to the buyers and sellers of biomass resources. As a result of this, their price varies from vendor to vendor even when considering the same feedstock. Entrepreneurs need to come forward and look forward to exploiting this opportunity, which could not only bridge the big missing link in the resource supply chain but also could transform into a multi-billion dollar opportunity.
6. High Risks / Low Paybacks
Biomass energy plants are plagued by numerous uncertainties including fuel price escalation and unreliable biomass resource supply to name just a few. Project owners should consider other opportunities to increase their profit margins. One of these could very well include tying up with the power exchanges as is the case in India, which could offer better prices for the power that is sold at peak hour slots.
The developer may also consider the option of merchant sale to agencies which are either in need of a consistent power supply and are presently relying on expensive back-up means (oil/coal) or are looking forward to purchase “green power” to cater to their Corporate Social Responsibility (CSR) initiatives.
7. Resource Price Escalation
A study of some of the successful biomass energy plants globally would result in the conclusion of the inevitability of having own biomass resource base to cater to the plant requirements. This could be through captive forestry or energy plantations at waste lands or fallow lands surrounding the plant site. Although, this could escalate the initial project costs, it would prove to be a great cushion to the plants operational costs in the longer run.
In cases where it is not possible to go for such an alternative, one must seek case-specific biomass procurement models, consider help from local NGOs, civic bodies etc. and go for long-term contracts with the resource providers.
Bioenergy is a renewable energy source derived from biological materials, such as plants, animals, and their byproducts. It has been used for thousands of years, dating back to the use of wood for heating and cooking. Today, bioenergy has evolved into a diverse and rapidly growing industry, with applications ranging from electricity generation to transportation fuels and bioproducts. This article will explore the various forms of bioenergy, their benefits, and the endless possibilities they offer for a sustainable future.
One of the most common forms of bioenergy is biomass, which refers to organic materials that can be used as fuel. Biomass can be obtained from various sources, including agricultural residues, forestry residues, and dedicated energy crops. These materials can be converted into different forms of energy, such as heat, electricity, and biofuels, through various processes, including combustion, gasification, and fermentation.
One example of biomass utilization is the production of biogas, a mixture of methane and carbon dioxide produced by the anaerobic digestion of organic matter. Biogas can be used as a fuel for heating, electricity generation, and transportation. It can also be upgraded to biomethane, a renewable natural gas that can be injected into the natural gas grid or used as a vehicle fuel. Biogas production not only provides a renewable energy source but also helps reduce greenhouse gas emissions by capturing methane that would otherwise be released into the atmosphere.
Another form of bioenergy is biofuels, which are liquid fuels derived from biomass. There are several types of biofuels, including ethanol, biodiesel, and advanced biofuels. Ethanol is the most widely used biofuel, primarily as a gasoline additive to reduce air pollution and greenhouse gas emissions. It is typically produced from sugar- and starch-rich crops, such as corn and sugarcane. Biodiesel, on the other hand, is made from vegetable oils, animal fats, and recycled cooking grease. It can be used as a diesel fuel substitute or blended with petroleum diesel to reduce emissions.
Advanced biofuels, also known as second-generation biofuels, are produced from non-food biomass sources, such as agricultural and forestry residues, municipal solid waste, and dedicated energy crops like switchgrass and miscanthus. These biofuels have the potential to significantly reduce greenhouse gas emissions compared to fossil fuels and do not compete with food production. Examples of advanced biofuels include cellulosic ethanol, renewable diesel, and biojet fuel.
In addition to energy production, bioenergy can also be used to produce various bioproducts, such as chemicals, materials, and pharmaceuticals. These bioproducts can replace petroleum-based products, reducing our dependence on fossil fuels and lowering greenhouse gas emissions. One example of bioproducts is bioplastics, which are made from renewable biomass sources like corn starch, cellulose, and vegetable oils. Bioplastics can be used in various applications, including packaging, automotive parts, and consumer goods.
The development of advanced biomanufacturing technologies has opened up new possibilities for bioenergy and bioproducts. For instance, GBI Biomanufacturing is a company that specializes in the production of high-value bioproducts using advanced fermentation processes. Their expertise in bioprocess development and optimization allows them to produce a wide range of products, from biofuels to specialty chemicals and pharmaceuticals. This demonstrates the versatility and potential of bioenergy in various industries.
One of the main benefits of bioenergy is its potential to reduce greenhouse gas emissions and mitigate climate change. Unlike fossil fuels, which release carbon dioxide when burned, bioenergy is considered carbon-neutral because the carbon dioxide released during combustion is offset by the carbon dioxide absorbed by plants during photosynthesis. Moreover, the use of bioenergy can help reduce our dependence on fossil fuels, enhancing energy security and diversifying the energy mix.
Another advantage of bioenergy is its potential to support rural economies and create jobs. The production of biomass and biofuels can provide new income opportunities for farmers and rural communities, as well as stimulate investment in infrastructure and technology. Furthermore, the development of advanced biomanufacturing facilities can create high-skilled jobs in research, engineering, and production.
Despite its numerous benefits, bioenergy also faces several challenges. One of the main concerns is the competition between bioenergy and food production, as some biofuels are produced from food crops like corn and sugarcane. This can lead to higher food prices and land-use changes, potentially affecting food security and biodiversity. However, the development of advanced biofuels from non-food biomass sources can help address this issue.
In recent years, the world has been grappling with the effects of climate change, dwindling natural resources, and increasing energy demands. As a result, there has been a growing interest in finding sustainable and renewable energy sources to meet these challenges. One such source is bioenergy, which has the potential to revolutionize the way we produce and consume energy. In this article, we will explore the various aspects of bioenergy, its benefits, and how it can change the world for the better.
Bioenergy is a form of renewable energy derived from organic materials, such as plants, animals, and microorganisms explains Scorpion Bio. These materials, known as biomass, can be converted into various forms of energy, including heat, electricity, and biofuels. The process of converting biomass into energy is called bioenergy production, and it can be achieved through various methods, such as combustion, gasification, and fermentation.
One of the main advantages of bioenergy is its renewability. Unlike fossil fuels, which are finite and take millions of years to form, biomass can be replenished relatively quickly through natural processes, such as photosynthesis and decomposition. This means that bioenergy has the potential to provide a sustainable and long-term solution to our energy needs.
Storage of biomass fuels is expensive and increases with capacity.
Another significant benefit of bioenergy is its potential to reduce greenhouse gas emissions. When biomass is burned or decomposed, it releases carbon dioxide (CO2) into the atmosphere. However, this CO2 can be absorbed by plants during photosynthesis, effectively creating a closed carbon cycle. This is in stark contrast to fossil fuels, which release CO2 that has been locked away for millions of years, contributing to the greenhouse effect and climate change. By replacing fossil fuels with bioenergy, we can significantly reduce our carbon footprint and mitigate the effects of climate change.
Bioenergy can also contribute to energy security and independence. Many countries, particularly those with limited fossil fuel resources, rely heavily on imports to meet their energy needs. This dependence can lead to economic and political instability, as well as vulnerability to supply disruptions. By investing in bioenergy production, countries can reduce their reliance on imported fuels and increase their energy self-sufficiency.
Moreover, bioenergy can play a crucial role in rural development and poverty alleviation. In many developing countries, agriculture is the primary source of income for rural communities. By integrating bioenergy production into existing agricultural practices, farmers can diversify their income sources and improve their livelihoods. For example, they can grow energy crops, such as switchgrass or miscanthus, alongside food crops, or use agricultural residues, such as straw or manure, to produce bioenergy. This can create new job opportunities, stimulate local economies, and contribute to sustainable development.
However, it is essential to recognize that bioenergy is not a one-size-fits-all solution. The sustainability and feasibility of bioenergy production depend on various factors, such as the type of biomass, the conversion method, and the local environmental and socio-economic conditions. Therefore, it is crucial to carefully assess the potential impacts and benefits of bioenergy projects on a case-by-case basis.
In addition to its environmental and socio-economic benefits, bioenergy also has the potential to drive technological innovation and scientific discovery. The development of advanced bioenergy production methods, such as genetic engineering, synthetic biology, and nanotechnology, can lead to new breakthroughs in various fields, from medicine to materials science. Furthermore, the interdisciplinary nature of bioenergy research can foster collaboration and knowledge exchange between scientists, engineers, and policymakers, ultimately contributing to a more sustainable and prosperous future.
Despite its many advantages, bioenergy also faces several challenges that need to be addressed to fully realize its potential. One of the main concerns is the competition between bioenergy and food production. The cultivation of energy crops can lead to land-use changes, deforestation, and biodiversity loss, as well as increased pressure on water and soil resources. To minimize these impacts, it is essential to promote sustainable land management practices, such as agroforestry, crop rotation, and conservation agriculture.
Another challenge is the need for significant investments in infrastructure, research, and development to scale up bioenergy production and make it cost-competitive with fossil fuels. This requires strong political commitment and public support, as well as collaboration between governments, industry, and academia. Incentives, such as subsidies, tax breaks, and feed-in tariffs, can also help stimulate investment and innovation in the bioenergy sector.
Most, if not all of Europe has a suitable climate for biogas production. The specific type of system depends on the regional climate. Regions with harsher winters may rely more on animal waste and other readily available materials compared to warmer climates, which may have access to more crop waste or organic material.
Regardless of suitability, European opinions vary on the most ethical and appropriate materials to use for biogas production. Multiple proponents argue biogas production should be limited to waste materials derived from crops and animals, while others claim crops should be grown with the intention of being used for biogas production.
Biogas Production From Crops
Europeans in favor of biogas production from energy crops argue the crops improve the quality of the soil. Additionally, they point to the fact that biogas is a renewable energy resource compared to fossil fuels. Crops can be rotated in fields and grown year after year as a sustainable source of fuel.
Extra crops can also improve air quality. Plants respire carbon dioxide and can help reduce harmful greenhouse gasses in the air which contribute to global climate change.
Energy crops can also improve water quality because of plant absorption. Crops grown in otherwise open fields reduce the volume of water runoff which makes it to lakes, streams and rivers. The flow of water and harmful pollutants is impeded by the plants and eventually absorbed into the soil, where it is purified.
Urban residents can also contribute to biogas production by growing rooftop or vertical gardens in their homes. Waste from tomatoes, beans and other vegetables is an excellent source of biogas material. Residents will benefit from improved air quality and improved water quality as well by reducing runoff.
Proponents of biogas production from crops aren’t against using organic waste material for biogas production in addition to crop material. They believe crops offer another means of using more sustainable energy resources.
Biogas Production From Agricultural Waste
Opponents to growing crops for biogas argue the crops used for biogas production degrade soil quality, making it less efficient for growing crops for human consumption. They also argue the overall emissions from biogas production from crops will be higher compared to fossil fuels.
Growing crops can be a labor-intensive process. Land must be cleared, fertilized and then seeded. While crops are growing, pesticides and additional fertilizers may be used to promote crop growth and decrease losses from pests. Excess chemicals can run off of fields and degrade the water quality of streams, lakes and rivers and kill off marine life.
Once crops reach maturity, they must be harvested and processed to be used for biogas material. Biogas is less efficient compared to fossil fuels, which means it requires more material to yield the same amount of energy. Opponents argue that when the entire supply chain is evaluated, biogas from crops creates higher rates of emissions and is more harmful to the environment.
Agricultural residues, such as rice straw, are an important carbon source for anaerobic digestion
In Europe, the supply chain for biogas from agricultural waste is more efficient compared to crop materials. Regardless of whether or not the organic waste is reused, it must be disposed of appropriately to prevent any detrimental environmental impacts. When crop residues are used for biogas production, it creates an economical means of generating useful electricity from material which would otherwise be disposed of.
Rural farms which are further away from the electric grid can create their own sources of energy through biogas production from agriculture wastes as well. The cost of the energy will be less expensive and more eco-friendly as it doesn’t have the associated transportation costs.
Although perspectives differ on the type of materials which should be used for biogas production, both sides agree biogas offers an environmentally friendly and sustainable alternative to using fossil fuels.
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