Danish city pioneers powering water treatment with sewage


* curated information

Using dirty water to generate clean water may sound like an unhygienic scam, but it’s about to become reality in Aarhus, Denmark. The city’s Marselisborg Wastewater Treatment Plant just got a new, state-of-the-art upgrade enabling it to generate 192 percent of its energy needs from sewage.

Wastewater processing facilities are notoriously energy-hungry, consuming roughly eight percent of the world’s electricity. With new energy-efficiency measures and its $3.19-million electricity-generating upgrade, the Marselisborg plant is a glimpse into the future of wastewater power.

Read more.

http://www.curbed.com/2016/12/7/13854984/aarhus-denmark-water-treatment-plant-sewage

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Waste to Energy Biogas Power Plant

We do turnkey biogas power plant projects. We are open to financing a a direct deal business with privately owned agricultural or livestock farm on a minimum of 2MW generation capacity or a multiple/clustered biogas power plant construction projects on different location.

We have designed, built, and commissioned more than 400 biogas power plants everywhere in the world.

Check it out.

https://jcgregsolutions.wordpress.com/2017/04/28/waste-to-energy-biogas-power-plant/

Wonder if you can make use of a biogas power plant to turn your organic waste into resources?

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InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

gregoriojess@yahoo.com

Fifth of world’s food lost to over-eating and waste, study finds


Using data collected primarily by the UN’s Food and Agriculture Organization, the team found that more food is lost from the system than was previously thought.
Almost half of harvested crops — or 2.1 billion tonnes — are lost through over-consumption, consumer waste and inefficiencies in production processes, researchers say.
Livestock production is the least efficient process, with losses of 78 per cent or 840 million tonnes, the team found. Some 1.08 billion tonnes of harvested crops are used to produce 240 million tonnes of edible animal products including meat, milk and eggs.
This stage alone accounts for 40 per cent of all losses of harvested crops, researchers say.

Read more.

https://www.sciencedaily.com/releases/2017/02/170221101024.htm

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Waste to Energy Biogas Power Plant



Plan to make use of your agro-industrial organic waste to generate power?

We do turnkey biogas power plant projects. We are open to financing a single and direct deal business with privately owned agricultural or livestock farm on a minimum of 2MW generation capacity or a multiple/clustered biogas power plant construction projects on different location.

We have designed, built, and commissioned more than 400 biogas power plants everywhere in the world.

https://jcgregsolutions.files.wordpress.com/2016/10/planet-international-project-track-record.pdf

For RFQ, kindly fill up questionnaire below and email back. We will assess your substrate sustainability, verify potential power generation, and submit a project price quotation for your evaluation and consideration.

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Jess C.Gregorio

InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

Email: gregoriojess@yahoo.com

PlanET Biogas GmbH Company Profile

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Introducing the terrifying mathematics of the Anthropocene


Fossil fuel has turned us into force of nature.
*curated information—

Here are some surprising facts about humans’ effect on planet Earth. We have made enough concrete to create an exact replica of Earth 2mm thick. We have produced enough plastic to wrap Earth in clingfilm. We are creating “technofossils”, a new term for congealed human-made materials – plastics and concretes – that will be around for tens of millions of years.

But it is the scale that humans have altered Earth’s life support system that is the most concerning.

Read more.

http://theconversation.com/introducing-the-terrifying-mathematics-of-the-anthropocene-70749

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Plan to make use of your MSW or agro-industrial organic waste to generate power?

We do turnkey biogas power plant projects. We can setup and commission your W2E infrastructure. Find you a local or an international project financing window. Or maybe a local JV business partner for big project plans. We are particularly looking for that one single deal of a clustered or multiple biogas power plant construction project to finance.

We have designed, built, and commissioned more than 400 biogas power plants everywhere in the world.

https://jcgregsolutions.files.wordpress.com/2016/10/planet-international-project-track-record.pdf

If interested and would like to tap our services, kindly fill up questionnaire below and email back. We will assess your substrate sustainability and see if a biogas power plant is right for you.

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Danke!

Jess C.Gregorio

InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

Email: gregoriojess@yahoo.com

PlanET Biogas GmbH Company Profile

https://jcgregsolutions.files.wordpress.com/2016/10/planet-company-profile.pdf

Biogas Frequently Asked Questions

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Biogas company aims to heat homes with the power of panda poop


*curated information…

BY LINY LAMBERINKPOSTED APR 19, 2016 5:46 PM EDTLAST UPDATED APR 19, 2016 AT 8:49 PM EDT

Biogas company aims to heat homes with the power of panda poop

There’s always been something smelly east of Meadowvale Road.

But now, the stench is getting sweeter.

ZooShare – a renewable energy co-operative – broke ground Tuesday on North America’s first ever zoo-based biogas plant.

The facility is being built on three hectares of land across the street from the Toronto Zoo and is taking over its composting facility, using the 3,000 tons of waste the animals produce each year to generate power.

Poop will be mixed with 14,000 tons of local grocery store waste, and will generate energy to power 250 homes for a year.

“[It’s] really a big concrete stomach,” says ZooShare Executive Director Daniel Bida, describing how the biogas plant will operate.

“If you feed organic waste into this concrete stomach, over a period of about 30 days, methane will be produced that can be used to generate electricity.”

Bida says burning the methane gas will create some emissions, but adds this is greatly offset by the positive impact of diverting waste from the landfill, where it would produce methane gas that would be released into the atmosphere regardless.

According to ZooShare’s website, the biogas plant’s operations will reduce greenhouse gas emissions by the equivalent of 10,000 tons of C02 annually. And afterwards, the waste can still be used as a nutrient-rich form of fertilizer.

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Plan to make use of your MSW or agro-industrial organic waste to generate power or have W2E projects?

We do local turnkey biogas power plant projects. We can build what you envision with no less than the state-of-the-art technology that you will require.

Biogas Frequently Asked Questions

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Waste to Energy. What is holding you back?

https://jcgregsolutions.wordpress.com/2016/10/23/waste-to-energy-what-is-holding-you/

History of Anaerobic Digestion

https://jcgregsolutions.wordpress.com/2016/10/17/a-short-history-of-anaerobic-digestion/

Jess C.Gregorio

InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

Email: gregoriojess@yahoo.com
We do SCADA, BMS, FDAS, FMS, HMI, and Control System Integration.

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The Concept of Biorefinery


*curated information…

By Salman Zafar

A biorefinery is a facility that integrates biomass conversion processes and equipment to produce fuels, power, and value-added chemicals from biomass. Biorefinery is analogous to today’s petroleum refinery, which produces multiple fuels and products from petroleum. By producing several products, a biorefinery takes advantage of the various components in biomass and their intermediates, therefore maximizing the value derived from the biomass feedstock.

A biorefinery could, for example, produce one or several low-volume, but high-value, chemical products and a low-value, but high-volume liquid transportation fuel such as biodiesel or bioethanol. At the same time, it can generate electricity and process heat, through CHP technology, for its own use and perhaps enough for sale of electricity to the local utility. The high value products increase profitability, the high-volume fuel helps meet energy needs, and the power production helps to lower energy costs and reduce GHG emissions from traditional power plant facilities.

Biorefinery Platforms

There are several platforms which can be employed in a biorefinery with the major ones being the sugar platform and the thermochemical platform (also known as syngas platform).

Sugar platform biorefineries breaks down biomass into different types of component sugars for fermentation or other biological processing into various fuels and chemicals. On the other hand, thermochemical biorefineries transform biomass into synthesis gas (hydrogen and carbon monoxide) or pyrolysis oil.

The thermochemical biomass conversion process is complex, and uses components, configurations, and operating conditions that are more typical of petroleum refining. Biomass is converted into syngas, and syngas is converted into an ethanol-rich mixture. However, syngas created from biomass contains contaminants such as tar and sulphur that interfere with the conversion of the syngas into products. These contaminants can be removed by tar-reforming catalysts and catalytic reforming processes. This not only cleans the syngas, it also creates more of it, improving process economics and ultimately cutting the cost of the resulting ethanol.

Plus Points

Biorefineries can help in utilizing the optimum energy potential of organic wastes and may also resolve the problems of waste management and GHGs emissions. Biomass wastes can be converted, through appropriate enzymatic/chemical treatment, into either gaseous or liquid fuels. The pre-treatment processes involved in biorefining generate products like paper-pulp, HFCS, solvents, acetate, resins, laminates, adhesives, flavour chemicals, activated carbon, fuel enhancers, undigested sugars etc. which generally remain untapped in the traditional processes. The suitability of this process is further enhanced from the fact that it can utilize a variety of biomass resources, whether plant-derived or animal-derived.

Future Perspectives

The concept of biorefinery is still in early stages at most places in the world. Problems like raw material availability, feasibility in product supply chain, scalability of the model are hampering its development at commercial-scales. The National Renewable Energy Laboratory (NREL) of USA is leading the front in biorefinery research with path-breaking discoveries and inventions. Although the technology is still in nascent stages, but it holds the key to the optimum utilization of wastes and natural resources that humans have always tried to achieve. The onus now lies on governments and corporate sector to incentivize or finance the research and development in this highly promising field.

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Plan to make use of your MSW or agro-industrial organic waste to generate power or have W2E projects?

We do local turnkey biogas power plant projects. We can build what you envision with no less than the state-of-the-art technology that you will require.

Biogas Frequently Asked Questions

https://jcgregsolutions.wordpress.com/2016/12/18/biogas-faq/

Waste to Energy. What is holding you back?

https://jcgregsolutions.wordpress.com/2016/10/23/waste-to-energy-what-is-holding-you/

History of Anaerobic Digestion

https://jcgregsolutions.wordpress.com/2016/10/17/a-short-history-of-anaerobic-digestion/

Jess C.Gregorio

InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

Email: gregoriojess@yahoo.com

We do SCADA, BMS, FDAS, FMS, HMI, and Control System Integration.

https://jcgregsolutions.wordpress.com/2016/07/31/over-and-above-scada-bms-fdas-hmi/

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Biochemical Conversion of Biomass


*curated information…

By Salman Zafar

Biochemical conversion of biomass involves use of bacteria, microorganisms and enzymes to breakdown biomass into gaseous or liquid fuels, such as biogas or bioethanol. The most popular biochemical technologies are anaerobic digestion (or biomethanation) and fermentation. Anaerobic digestion is a series of chemical reactions during which organic material is decomposed through the metabolic pathways of naturally occurring microorganisms in an oxygen depleted environment. Biomass wastes can also yield liquid fuels, such as cellulosic ethanol, which can be used to replace petroleum-based fuels.

Anaerobic Digestion

Anaerobic digestion is the natural biological process which stabilizes organic waste in the absence of air and transforms it into biofertilizer and biogas. Anaerobic digestion is a reliable technology for the treatment of wet, organic waste. Organic waste from various sources is biochemically degraded in highly controlled, oxygen-free conditions circumstances resulting in the production of biogas which can be used to produce both electricity and heat. Almost any organic material can be processed with anaerobic digestion. This includes biodegradable waste materials such as municipal solid waste, animal manure, poultry litter, food wastes, sewage and industrial wastes.

An anaerobic digestion plant produces two outputs, biogas and digestate, both can be further processed or utilized to produce secondary outputs. Biogas can be used for producing electricity and heat, as a natural gas substitute and also a transportation fuel. A combined heat and power plant system (CHP) not only generates power but also produces heat for in-house requirements to maintain desired temperature level in the digester during cold season. In Sweden, the compressed biogas is used as a transportation fuel for cars and buses. Biogas can also be upgraded and used in gas supply networks.


Working of Anaerobic Digestion Process

Digestate can be further processed to produce liquor and a fibrous material. The fiber, which can be processed into compost, is a bulky material with low levels of nutrients and can be used as a soil conditioner or a low level fertilizer. A high proportion of the nutrients remain in the liquor, which can be used as a liquid fertilizer.

Biofuel Production

A variety of fuels can be produced from waste resources including liquid fuels, such as ethanol, methanol, biodiesel, Fischer-Tropsch diesel, and gaseous fuels, such as hydrogen and methane. The resource base for biofuel production is composed of a wide variety of forestry and agricultural resources, industrial processing residues, and municipal solid and urban wood residues. Globally, biofuels are most commonly used to power vehicles, heat homes, and for cooking.

The largest potential feedstock for ethanol is lignocellulosic biomass wastes, which includes materials such as agricultural residues (corn stover, crop straws and bagasse), herbaceous crops (alfalfa, switchgrass), short rotation woody crops, forestry residues, waste paper and other wastes (municipal and industrial). Bioethanol production from these feedstocks could be an attractive alternative for disposal of these residues. Importantly, lignocellulosic feedstocks do not interfere with food security.

Ethanol from lignocellulosic biomass is produced mainly via biochemical routes. The three major steps involved are pretreatment, enzymatic hydrolysis, and fermentation. Biomass is pretreated to improve the accessibility of enzymes. After pretreatment, biomass undergoes enzymatic hydrolysis for conversion of polysaccharides into monomer sugars, such as glucose and xylose. Subsequently, sugars are fermented to ethanol by the use of different microorganisms.

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Plan to make use of your MSW or agro-industrial organic waste to generate power or have W2E projects?

We do local turnkey biogas power plant projects. We can build what you envision with no less than the state-of-the-art technology that you will require.

Biogas Frequently Asked Questions

https://jcgregsolutions.wordpress.com/2016/12/18/biogas-faq/

Waste to Energy. What is holding you back?

https://jcgregsolutions.wordpress.com/2016/10/23/waste-to-energy-what-is-holding-you/

History of Anaerobic Digestion

https://jcgregsolutions.wordpress.com/2016/10/17/a-short-history-of-anaerobic-digestion/

Jess C.Gregorio

InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

Email: gregoriojess@yahoo.com

We do SCADA, BMS, FDAS, FMS, HMI, and Control System Integration.

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Trends in Utilization of Biogas


//curated information.

By Salman Zafar

The valuable component of biogas is methane (CH4) which typically makes up 60%, with the balance being carbon dioxide (CO2) and small percentages of other gases. The proportion of methane depends on the feedstock and the efficiency of the process, with the range for methane content being 40% to 70%. Biogas is saturated and contains H2S, and the simplest use is in a boiler to produce hot water or steam.

The most common use is where the biogas fuels an internal combustion gas engine in a Combined Heat and Power (CHP) unit to produce electricity and heat. In Sweden the compressed gas is used as a vehicle fuel and there are a number of biogas filling stations for cars and buses. The gas can also be upgraded and used in gas supply networks. The use of biogas in solid oxide fuel cells is also being researched.

Biogas can be combusted directly to produce heat. In this case, there is no need to scrub the hydrogen sulphide in the biogas. Usually the process utilize dual-fuel burner and the conversion efficiency is 80 to 90%. The main components of the system are anaerobic digester, biogas holder, pressure switch, booster fan, solenoid valve, dual fuel burner and combustion air blower.

The most common method for utilization of biogas in developing countries is for cooking and lighting. Conventional gas burners and gas lamps can easily be adjusted to biogas by changing the air to gas ratio. In more industrialized countries boilers are present only in a small number of plants where biogas is used as fuel only without additional CHP. In a number of industrial applications biogas is used for steam production.

Burning biogas in a boiler is an established and reliable technology. Low demands are set on the biogas quality for this application. Pressure usually has to be around 8 to 25 mbar. Furthermore it is recommended to reduce the level of hydrogen sulphide to below 1 000 ppm, this allows to maintain the dew point around 150 °C.

CHP Applications

Biogas is the ideal fuel for generation of electric power or combined heat and power. A number of different technologies are available and applied. The most common technology for power generation is internal combustion. Engines are available in sizes from a few kilowatts up to several megawatts. Gas engines can either be SI-engines (spark ignition) or dual fuel engines. Dual fuel engines with injection of diesel (10% and up) or sometimes plant oil are very popular in smaller scales because they have good electric efficiencies up to guaranteed 43%.

The biogas pressure is turbo-charged and after-cooled and has a high compression ratio in the gas engines. The cooling tower provides cooling water for the gas engines. The main component of the system required for utilizing the technology are anaerobic digester, moisture remover, flame arrester, waste gas burner, scrubber, compressor, storage, receiver, regulator, pressure switch and switch board.

Gas turbines are an established technology in sizes above 500 kW. In recent years also small scale engines, so called micro-turbines in the range of 25 to 100kW have been successfully introduced in biogas applications. They have efficiencies comparable to small SI-engines with low emissions and allow recovery of low pressure steam which is interesting for industrial applications. Micro turbines are small, high-speed, integrated power plants that include a turbine, compressor, generator and power electronics to produce power.

New Trends
The benefit of the anaerobic treatment will depend on the improvement of the process regarding a higher biogas yield per m3 of biomass and an increase in the degree of degradation. Furthermore, the benefit of the process can be multiplied by the conversion of the effluent from the process into a valuable product. In order to improve the economical benefit of biogas production, the future trend will go to integrated concepts of different conversion processes, where biogas production will still be a significant part. In a so-called biorefinery concept, close to 100% of the biomass is converted into energy or valuable by-products, making the whole concept more economically profitable and increasing the value in terms of sustainability.

One example of such biorefinery concept is the Danish Bioethanol Concept that combines the production of bioethanol from lignocellulosic biomass with biogas production of the residue stream. Another example is the combination of biogas production from manure with manure separation into a liquid and a solid fraction for separation of nutrients. One of the most promising concepts is the treatment of the liquid fraction on the farm-site in a UASB reactor while the solid fraction is transported to the centralized biogas plant where wet-oxidation can be implemented to increase the biogas yield of the fiber fraction. Integration of the wet oxidation pre-treatment of the solid fraction leads to a high degradation efficiency of the lignocellulosic solid fraction.

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Plan to make use of your MSW or agro-industrial organic waste to generate power or have W2E projects?

We do local turnkey biogas power plant projects. We can build what you envision with no less than the state-of-the-art technology that you will require.

Biogas Frequently Asked Questions

https://jcgregsolutions.wordpress.com/2016/12/18/biogas-faq/

Waste to Energy. What is holding you back?

https://jcgregsolutions.wordpress.com/2016/10/23/waste-to-energy-what-is-holding-you/

History of Anaerobic Digestion

https://jcgregsolutions.wordpress.com/2016/10/17/a-short-history-of-anaerobic-digestion/

Jess C.Gregorio

InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

Email: gregoriojess@yahoo.com

We do SCADA, BMS, FDAS, FMS, HMI, and Control System Integration.

https://jcgregsolutions.wordpress.com/2016/07/31/over-and-above-scada-bms-fdas-hmi/

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A Primer on Waste-to-Energy


//curated information.

By Salman Zafar

Waste-to-Energy is the use of modern combustion and biochemical technologies to recover energy, usually in the form of electricity and steam, from urban wastes. These new technologies can reduce the volume of the original waste by 90%, depending upon composition and use of outputs.

Energy is the driving force for development in all countries of the world. The increasing clamor for energy and satisfying it with a combination of conventional and renewable resources is a big challenge. Accompanying energy problems in different parts of the world, another problem that is assuming critical proportions is that of urban waste accumulation. The quantity of waste produced all over the world amounted to more than 12 billion tonnes in 2006, with estimates of up to 13 billion tonnes in 2011. The rapid increase in population coupled with changing lifestyle and consumption patterns is expected to result in an exponential increase in waste generation of upto 18 billion tonnes by year 2020.

Waste generation rates are affected by socio-economic development, degree of industrialization, and climate. Generally, the greater the economic prosperity and the higher percentage of urban population, the greater the amount of solid waste produced. Reduction in the volume and mass of solid waste is a crucial issue especially in the light of limited availability of final disposal sites in many parts of the world. Millions of tonnes of waste are generated each year with the vast majority disposed of in open fields or burnt wantonly.

The main categories of waste-to-energy technologies are physical technologies, which process waste to make it more useful as fuel; thermal technologies, which can yield heat, fuel oil, or syngas from both organic and inorganic wastes; and biological technologies, in which bacterial fermentation is used to digest organic wastes to yield fuel.

The three principal methods of thermochemical conversion are combustion in excess air, gasification in reduced air, and pyrolysis in the absence of air. The most common technique for producing both heat and electrical energy from wastes is direct combustion. Combined heat and power (CHP) or cogeneration systems, ranging from small-scale technology to large grid-connected facilities, provide significantly higher efficiencies than systems that only generate electricity.

Biochemical processes, like anaerobic digestion, can also produce clean energy in the form of biogas which can be converted to power and heat using a gas engine. In addition, wastes can also yield liquid fuels, such as cellulosic ethanol, which can be used to replace petroleum-based fuels. Cellulosic ethanol can be produced from grasses, wood chips and agricultural residues by biochemical route using heat, pressure, chemicals and enzymes to unlock the sugars in biomass wastes.

Waste-to-energy plants offer two important benefits of environmentally safe waste management and disposal, as well as the generation of clean electric power. The growing use of waste-to-energy as a method to dispose of solid and liquid wastes and generate power has greatly reduced environmental impacts of municipal solid waste management, including emissions of greenhouse gases.

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🕶Biogas Power AdPlugIT

Plan to make use of your MSW or agro-industrial organic waste to generate power or have W2E projects?

We do local turnkey biogas power plant projects. We can build what you envision with no less than the state-of-the-art technology that you will require.

Biogas Frequently Asked Questions

https://jcgregsolutions.wordpress.com/2016/12/18/biogas-faq/

Waste to Energy. What is holding you back?

https://jcgregsolutions.wordpress.com/2016/10/23/waste-to-energy-what-is-holding-you/

History of Anaerobic Digestion

https://jcgregsolutions.wordpress.com/2016/10/17/a-short-history-of-anaerobic-digestion/

Jess C.Gregorio

InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

Email: gregoriojess@yahoo.com

We do SCADA, BMS, FDAS, FMS, HMI, and Control System Integration.

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Biomass as Energy Resources


//curated information…

By Salman Zafar

biomass_feedstockBiomass resources include plant and animal material such as wood from forests, material left over from agricultural and forestry processes, and organic industrial, human and animal wastes. The energy contained in biomass originally came from the sun. Through photosynthesis carbon dioxide in the air is transformed into other carbon containing molecules (e.g. sugars, starches and cellulose) in plants. The chemical energy that is stored in plants and animals (animals eat plants or other animals) or in their waste is called bio-energy. Biomass comes from a variety of sources which include:

Wood from natural forests and woodlands

Forestry plantations

Forestry residues

Agricultural residues such as straw, stover, cane trash and green agricultural wastes

Agro-industrial wastes, such as sugarcane bagasse and rice husk

Animal wastes

Industrial wastes, such as black liquor from paper manufacturing

Sewage

Municipal solid wastes (MSW)

Food processing wastes

Biomass energy projects provide major business opportunities, environmental benefits, and rural development. Feedstocks can be obtained from a wide array of sources without jeopardizing the food and feed supply, forests, and biodiversity in the world.

Agricultural Residues
Crop residues encompasses all agricultural wastes such as bagasse, straw, stem, stalk, leaves, husk, shell, peel, pulp, stubble, etc. Large quantities of crop residues are produced annually worldwide, and are vastly underutilised. 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. Sugar cane 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 utilized.

Current farming practice is usually to plough these residues back into the soil, or they are burnt, left to decompose, or grazed by cattle. These residues could be processed into liquid fuels or thermochemical processed to produce electricity and heat. Agricultural residues are characterized by seasonal availability and have characteristics that differ from other solid fuels such as wood, charcoal, char briquette. The main differences are the high content of volatile matter and lower density and burning time.

Animal Waste
There are a wide range of animal wastes that can be used as sources of biomass energy. The most common sources are animal and poultry manures. In the past this waste was recovered and sold as a fertilizer or simply spread onto agricultural land, but the introduction of tighter environmental controls on odour and water pollution means that some form of waste management is now required, which provides further incentives for waste-to-energy conversion.

The most attractive method of converting these waste materials to useful form is anaerobic digestion which gives biogas that can be used as a fuel for internal combustion engines, to generate electricity from small gas turbines, burnt directly for cooking, or for space and water heating.

Forestry Residues
Forestry residues are generated by operations such as thinning of plantations, clearing for logging roads, extracting stem-wood for pulp and timber, and natural attrition. Harvesting may occur as thinning in young stands, or cutting in older stands for timber or pulp that also yields tops and branches usable for biomass energy. Harvesting operations usually remove only 25 to 50 percent of the volume, leaving the residues available as biomass for energy.

Stands damaged by insects, disease or fire are additional sources of biomass. Forest residues normally have low density and fuel values that keep transport costs high, and so it is economical to reduce the biomass density in the forest itself.

Wood Wastes
Wood processing industries primarily include sawmilling, plywood, wood panel, furniture, building component, flooring, particle board, moulding, jointing and craft industries. Wood wastes generally are concentrated at the processing factories, e.g. plywood mills and sawmills. The amount of waste generated from wood processing industries varies from one type industry to another depending on the form of raw material and finished product.

Generally, the waste from wood industries such as saw millings and plywood, veneer and others are sawdust, off-cuts, trims and shavings. Sawdust arise from cutting, sizing, re-sawing, edging, while trims and shaving are the consequence of trimming and smoothing of wood. In general, processing of 1,000 kg of wood in the furniture industries will lead to waste generation of almost half (45 %), i.e. 450 kg of wood. Similarly, when processing 1,000 kg of wood in sawmill, the waste will amount to more than half (52 %), i.e. 520 kg wood.

Industrial Wastes
The food industry produces a large number of residues and by-products that can be used as biomass energy sources. These waste materials are generated from all sectors of the food industry with everything from meat production to confectionery producing waste that can be utilised as an energy source.

Solid wastes include peelings and scraps from fruit and vegetables, food that does not meet quality control standards, pulp and fibre from sugar and starch extraction, filter sludges and coffee grounds. These wastes are usually disposed of in landfill dumps.

Liquid wastes are generated by washing meat, fruit and vegetables, blanching fruit and vegetables, pre-cooking meats, poultry and fish, cleaning and processing operations as well as wine making.

These waste waters contain sugars, starches and other dissolved and solid organic matter. The potential exists for these industrial wastes to be anaerobically digested to produce biogas, or fermented to produce ethanol, and several commercial examples of waste-to-energy conversion already exist.

Pulp and paper industry is considered to be one of the highly polluting industries and consumes large amount of energy and water in various unit operations. The wastewater discharged by this industry is highly heterogeneous as it contains compounds from wood or other raw materials, processed chemicals as well as compound formed during processing. Black liquor can be judiciously utilized for production of biogas using anaerobic UASB technology.

Municipal Solid Wastes and Sewage
Millions of tonnes of household waste are collected each year with the vast majority disposed of in open fields. The biomass resource in MSW comprises the putrescibles, paper and plastic and averages 80% of the total MSW collected. Municipal solid waste can be converted into energy by direct combustion, or by natural anaerobic digestion in the engineered landfill. At the landfill sites the gas produced by the natural decomposition of MSW (approximately 50% methane and 50% carbon dioxide) is collected from the stored material and scrubbed and cleaned before feeding into internal combustion engines or gas turbines to generate heat and power. The organic fraction of MSW can be anaerobically stabilized in a high-rate digester to obtain biogas for electricity or steam generation.

Sewage is a source of biomass energy that is very similar to the other animal wastes. Energy can be extracted from sewage using anaerobic digestion to produce biogas. The sewage sludge that remains can be incinerated or undergo pyrolysis to produce more biogas.

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Biogas Frequently Asked Questions

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Waste to Energy. What is holding you back?

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History of Anaerobic Digestion

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Jess C.Gregorio

InSpecIT Inc.

Unit 719/722 City & Land Mega Plaza Bldg.

ADB Ave. cor. Garnet Road, Ortigas Center

San Antonio, Pasig City, Philippines 1605

Email: gregoriojess@yahoo.com

We do SCADA, BMS, FDAS, FMS, HMI, and Control System Integration.

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