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Methane production by
anaerobic digestion of biomass
Energias Renováveis 1 – Módulo de Biomassa - Mestrado em Energias Sustentáveis - © Nídia de Sá Caetano, 2014
Estimating the amount of biogas from biomass in
anaerobic conditions
Estimate the total theoretical amount of biogas that can be produced under
anaerobic conditions in an organic recovery facility, per ton of biomass. Assume
that the available biomass has a composition such that the moisture content is
41.5% and the overall chemical

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Energias Renováveis 1
–
Módulo de Biomassa - Mestrado em Energias Sustentáveis - © Nídia de Sá Caetano, 2014
Methane production by anaerobic digestion of biomass
Energias Renováveis 1
–
Módulo de Biomassa - Mestrado em Energias Sustentáveis - © Nídia de Sá Caetano, 2014
Estimate the total theoretical amount of biogas that can be produced under anaerobic conditions in an organic recovery facility, per ton of biomass. Assume that the available biomass has a composition such that the moisture content is 41.5% and the overall chemical formula for dry fraction is C
61.3
H
97.8
O
35.2
N. Also estimate the monetary value of biogas and the amount of energy that can be obtained from the biogas produced.
CH
4
and CO
2
densities are 0.7177 and 1.9783 kg/m
3
, respectively.
Carbon: M
C
= 12 g/mol
Hydrogen: M
H
= 1 g/mol
Oxygen: M
O
= 16 g/mol Nitrogen: M
N
= 14 g/mol Heating value of biogas = 4450 kcal/m
3
Value of biogas = 0,426
€
/m
3
Estimating the amount of biogas from biomass in anaerobic conditions
3242
NH d COCH O H N O H C
d cba
4324
d cba
8324
d cba
8324
d cba
Energias Renováveis 1
–
Módulo de Biomassa - Mestrado em Energias Sustentáveis - © Nídia de Sá Caetano, 2014
Estimate the total theoretical amount of gas that can be produced under anaerobic conditions in a landfill per unit mass of solid waste. Assume that the waste has a composition such that the overall chemical formula for the organic constituents is C
60.0
H
94.3
O
37.8
N. CH
4
and CO
2
densities are 0.7177 and 1.9783 kg/m
3
, respectively.
Consider also the following atomic weights: Carbon: M
C
= 12 g/mol Hydrogen: M
H
= 1 g/mol Oxygen: M
O
= 16 g/mol Nitrogen: M
N
= 14 g/mol
Estimation of the amount of biogas produced from the organic fraction (OF) of municipal solid waste (MSW) under anaerobic conditions
3242
NH d COCH O H N O H C
d cba
4324
d cba
8324
d cba
8324
d cba
Energias Renováveis 1
–
Módulo de Biomassa - Mestrado em Energias Sustentáveis - © Nídia de Sá Caetano, 2014
Methane recovery from the anaerobic digestion of the organic fraction (OF) of MSW
Calculate the amount of methane that can be recovered from 1 ton of biowaste, consisting of the organic fraction (OF) of MSW, and its monetary value.
Assume that the following conditions are applicable and data : - Moisture content of the organic fraction of MSW = 20% - Retention time = 30 d - Volatile solids voláteis, VS = 0.93 x ST (total solids) - Biodegradable volatile solids, BVS = 0.70 x VS - Expected efficiency for the conversion of BVS = 95% - Gas production = 8 ft
3
/lb
BVS destroyed
- Biogas heating value = 500 BTU/ft
3
- One term of power = 10
5
BTU/term - The value of 1 term of power = 108$00/term

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