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Friday, January 23, 2015

Biogas composition in anaerobic digestion;

Biogas composition food waste, manure, cow dung and slurry;

Biogas and its composition;

Biogas is a gas produced by the biological breakdown of organic matter in the absence of oxygen. 

Biogas composition methane:

1.    Biogas originates from biogenic material and is a type of biofuel;
2.    Biogas is produced by anaerobic digestion or fermentation of biodegradable materials such as biomass, manures, sewage, municipal wastes, green wastes, plant material, and energy crops;
3.    This type of gas comprises primarily methane and carbon dioxide;
4.    Other types of gas generated by using of biomass are wood gas, which is created by gasification of wood or other biomass;
5.    This type of gas consists primarily of nitrogen, hydrogen, and carbon monoxide, with trace amounts of methane;
6.    The gases methane, hydrogen and carbon monoxide can be combusted or oxidized with oxygen;
7.    Air contains 21% oxygen.

Biogas composition and upgrading to biomethane:

1.    The energy release allows biogas to be used as a fuel;
2.    Biogas can be used as a low-cost fuel in any country of the world for any heating purpose, such as cooking or heating;
3.    It can also be used in modern waste management facilities where it can be upgraded and used to run any type of heat engine, to generate either mechanical or electrical power;
4.    Biogas can be compressed, much like natural gas, and used to power motor vehicles, formation of photochemical smog.

Biogas composition analysis:

1.    The main chemical composition of biogas is Methane CH4 from 50 to ‎‎75%;
2.    Carbon dioxide CO2 from 25 to 50%;
3.    Nitrogen N2 from ‎0 to 10%;
4.    Hydrogen H2 from 0 to 1%;
5.    Hydrogen sulfide H2S from 0 to 3%;
6.    Oxygen O2 to very small traces;
7.    The composition of biogas varies depending upon the origin of the anaerobic digestion process.

Landfill biogas composition:

1.    Landfill gas typically has methane concentrations around 50%;
2.    Advanced waste treatment technologies can produce biogas with 55 to 75% methane CH4 or higher using in site purification techniques as produced;
3.    Biogas also contains water vapor and the fractional water vapor volume is a function of biogas temperature.
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