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गुरुवार, 22 दिसंबर 2011

boigas plant

Biogas composition

Biogas is characterized based on its chemical composition and the physical characteristics which result from it. It is primarily a mixture of methane (CH4) and inert carbonic gas (CO2). However the name “biogas” gathers a large variety of gases resulting from specific treatment processes, starting from various organic waste - industries, animal or domestic origin waste etc 

Chemical composition

Different sources of production lead to different specific compositions. The presence of H2S, of CO2 and water make biogas very corrosive and require the use of adapted materials. The composition of a gas issued from a digester depends on the substrate, of its organic matter load, and the feeding rate of the digester
ComponentsHousehold wasteWastewater treatment plants sludgeAgricultural wastesWaste of agrifood industry
CH4 % vol50-6060-7560-7568
CO2 % vol38-3433-1933-1926
N2 % vol5-01-01-0-
O2  % vol1-0< 0,5< 0,5-
H2O % vol6 (à 40 ° C)6 (à 40 ° C)6 (à 40 ° C)6 (à 40 ° C)
Total % vol100100100100
H2S mg/m3100 - 9001000 - 40003000 – 10 000400
NH3 mg/m3--50 - 100-
Aromatic mg/m30 - 200---
Organochlorinated  or organofluorated  mg/m3100-800--

Physical characteristics

According to its composition, biogas presents characteristics interesting to compare with natural gas and propane. Biogas is a gas appreciably lighter than air, it produces twice as less calories by combustion with equal volume of natural gas.

Types of gasBiogas 1
Household waste
Biogas 2
Agrifood industry
Natural gas
Composition60% CH4
33 % CO2
1% N2
0% O2
6% H2O
68% CH4
26 % CO2
1% N2
0% O2
5 % H2O
97,0% CH4
2,2% C2
0,3% C3
0,1% C4+
0,4% N2
PCS kWh/m36,67,511,3
PCI kWh/m36,06,810,3
Mass (kg/m3)1,211,110,73
Indiex of Wobbe6,98,114,9

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