Biogas from Agricultural Wastes


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The main problem with anaerobic digestion of crop residues is that most of the agricultural residues are lignocellulosic with low nitrogen content.

Salman Zafar‘s insight:

Crop residues can be digested either alone or in co-digestion with other materials, employing either wet or dry processes. In the agricultural sector one possible solution to processing crop biomass is co-digestion together with animal manures, the largest agricultural waste stream. 

See on www.bioenergyconsult.com

Biogas Upgradation using Pressure Swing Adsorption


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Pressure swing adsorption (PSA), also known as carbon molecular sieves, is the second most commonly used biogas upgrading technology in Europe.

Salman Zafar‘s insight:

The upgrading takes place over 4 phases: pressure build-up, adsorption, depressurization and regeneration. The pressure buildup is achieved by equilibrating pressure with a vessel that is at depressurization stage. Final pressure build up occurs by injecting raw biogas. During adsorption, CO2 and/or N2 and/or O2 are adsorbed by the media and the gas exits as CH4.

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Merits of Anaerobic Digestion of Wastes


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Anaerobic digestion is the natural biological process which stabilizes organic waste in the absence of air and transforms it into biofertilizer and biogas. It is a reliable technology for the treat…

Salman Zafar‘s insight:

Anaerobic digestion is particularly suited to wet organic material and is commonly used for effluent and sewage treatment.  This includes biodegradable waste materials such as waste paper, grass clippings, leftover food, sewage and animal waste.

See on www.ecomena.org

Biological Cleanup of Biogas


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Biogas basically consists of methane and carbon dioxide. In addition, it also contains unwanted contaminants, especially hydrogen sulfide (H2S). Hydrogen sulfide mainly occurs because of the degrad…

Salman Zafar‘s insight:

Biological H2S removal is attractive because of low energy and chemical usage requirements, easy and automated operation, long life expectancy of system elements, potential for elemental sulfur recovery, and no solid waste stream requiring discharge or disposal. The key to obtaining an efficient reaction is to provide an ideal habitat for the growth of sulfide-oxidizing bacteria, to the exclusion of competing microbes, which normally predominate in aerobic treatment processes. 

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Overview of Biogas Storage Methods


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Selection of an appropriate biogas storage system makes a significant contribution to the efficiency and safety of a biogas plant.

Salman Zafar‘s insight:

The simplest and least expensive storage systems for on-site applications and intermediate storage of biogas are low-pressure systems. The energy, safety, and scrubbing requirements of medium- and high-pressure storage systems make them costly and high-maintenance options for non-commercial use.

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Biomass Energy Scenario in ASEAN Countries


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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.

Salman Zafar‘s insight:

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.

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Resource Base for Biogas Production in Middle East


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Anaerobic digestion (or biogas technology) is the natural biological process which stabilizes organic waste in the absence of air and transforms it into biofertilizer and biogas. It is a reliable t…

Salman Zafar‘s insight:

A wide range of organic substances are anaerobically easily degradable without major pretreatment. Among these are leachates, slops, sludges, oils, fats or whey. Some wastes can form inhibiting metabolites (e.g.NH3) during anaerobic digestion which require higher dilutions with substrates like manure or sewage sludge.

See on www.ecomena.org