Inderscience Publishers

Comparative assessment of anaerobic digestion of municipal solid waste at mesophilic and thermophilic temperatures

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Anaerobic digestion is an environmentally sound treatment option for the organic fraction of municipal solid waste (OFMSW) and simultaneously producing methane gas which is a source of renewable energy. The COD reduction of the substrate was 72% for the mesophilic condition and 72.3% for the thermophilic condition. 1200 cm³ of methane was produced in the mesophilic condition and 1260 cm³ in the thermophilic condition. The methane content, by volume, in the biogas was found to be 60% and 63% in the mesophilic and thermophilic condition respectively. It was also found that 0.723 cm³ of methane per unit weight of substrate was produced at the mesophilic condition and 0.760 cm³ of methane per unit weight of substrate at the thermophilic condition. The gas production rate for mesophilic and thermophilic condition were 0.0214 m³ (m³d)
−1
and 0.046 m³ (m³d)
−1
respectively and the methane yield was more or less the same in both cases. The methane yield in mesophilic condition was 0.0614 m³/kg COD and that at thermophilic condition was 0.0612 m³/kg COD.

Keywords: anaerobic digestion, MSW, municipal solid waste, organic fraction, biogas, mesophilic temperature, thermophilic temperature, methane yield

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