Biomass anaerobic digestion

Ana.eroblc Digestion. Methane can be produced from water slurries of biomass by anaerobic digestion in the presence of mixed populations of anaerobes. This process has been used for many years to stabilize municipal sewage sludges for purposes of disposal. Presuming the biomass is all cellulose, the chemistry can be represented in simplified form as follows ... 

Gasification. Conversion of biomass to gaseous fuels can be accompHshed by several methods only two are used by the biomass energy industry (ca 1992). One is thermal gasification in which LHV gas, ie, producer gas, is produced. The other process is anaerobic digestion, which yields an MHVgas. 

Anaerobic Digestion of Biomass Chynoweth, D. P. Isaacson, R. Eds Elsevier Applied Science London, 1987. 

Biofuel generation from sweet sorghum Fermentative hydrogen production and anaerobic digestion of the remaining biomass. Biores. Technol. 99 (1), 110-119. 

Biomass from an anaerobic digester Reactive dyes disperse dyes Fixed bed with recycle and fixed bed Continuous Anaerobic B Reticulated sintered glass n.a. 37 6.4-7.2... 

Chynoweth DP, Isaacson R (1987) Anaerobic digestion of biomass. Elsevier Applied Science, London... 

Biochemical conversion, or bioconversion, is a chemical reaction caused by treating moist biomass with microorganisms such as enzymes or fungi. The end products may be liquid or gaseous fuels. Anaerobic digestion and fermentation are the two processes used for biochemically... 

After aeration for 3-5 days, flooding with heated excess liquid the charge will be heated to 55-60°C. The feeding orifice then will hermetically be closed and the anaerob digestion lasting 3-4 weeks will be started. During this process the temperature of the biomass will be reduced daily by 1-1°C, while at the end of digestion it will reach 30-... 

There is the possibility of using other available fuels such as light distillates, ethanol, anaerobic digester gas, biomass, and refuse-derived fuel. However, these fuels apply to niche market applications. Fuel cell application here, if practical, will evolve from and after widespread uses. Users may require an alternate fuel, probably natural gas. 

In the present chapter, anaerobic digestion (AD) is chosen as an illustrative example of biological WWTPs. It is a set of biological processes that take place in the absence of oxygen and by which organic matter is decomposed and converted on one hand into biogas i.e., a mixture of mainly carbon dioxide and methane) and, on the other hand, into microbial biomass and... 

Mclnemey Ml, Bryant MR. 1981. Basic principles of bioconversions in anaerobic digestion and methanogenesis. In Sofer SS, Zaborsky OR, editors. Biomass conversion processes for energy and fuels. New York Plenum, p 277-96. 

Biogas is considered a clean, cheap and versatile gaseous fuel that is also environmentally friendly. It is mainly a mixture of methane and carbon dioxide obtained by anaerobic digestion of biomass, sewage sludge, animal wastes, and industrial effluents. Anaerobic digestion occurs in the absence of air and is typically carried out for a few weeks. 

Most often, the rates for feedstock destruction in anaerobic digestion systems are based upon biogas production or reduction of total solids (TS) or volatile solids (VS) added to the system. Available data for analyses conducted on the specific polymers in the anaerobic digester feed are summarized in Table II. The information indicates a rapid rate of hydrolysis for hemicellulose and lipids. The rates and extent of cellulose degradation vary dramatically and are different with respect to the MSW feedstock based on the source and processing of the paper and cardboard products (42). Rates for protein hydrolysis are particularly difficult to accurately determine due the biotransformation of feed protein into microbial biomass, which is representative of protein in the effluent of the anaerobic digestion system. 

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