Anaerobic Digestion

Biomethane Production of Municipal Solid Waste and Sewage Sludge

Anaerobic digestion is a useful method for producing clean fuel from renewable feedstocks. It is a biological process where biodegradable matter is degraded or decomposed by the activity of specific microorganisms in the absence of oxygen, producing biogas used for electricity and heat generation. Biogas is produced under anaerobic conditions; the process is denominated as anaerobic digestion. The major constituent of biogas is methane (55-70%), CO2 (30-45%) and some traces of gases such as H2S and ammonia. 
About 20kg of organic biomass can produce one cubic meter of biogas/day which is approximately equivalent to generate 6kWh. The 6kWh power is sufficient energy to power three 100W incandescent bulbs for 20 hours. While the residue sludge after producing biogas is then used as a natural organic fertilizer rich in nitrogen, phosphorus and potassium for farming edible crops.

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