Anaerobic digestion of source-segregated domestic food waste: Performance assessment by mass and energy balance
2011
Banks, Charles J. | Chesshire, Michael | Heaven, Sonia | Arnold, Rebecca
An anaerobic digester receiving food waste collected mainly from domestic kitchens was monitored over a period of 426days. During this time information was gathered on the waste input material, the biogas production, and the digestate characteristics. A mass balance accounted for over 90% of the material entering the plant leaving as gaseous or digestate products. A comprehensive energy balance for the same period showed that for each tonne of input material the potential recoverable energy was 405kWh. Biogas production in the digester was stable at 642m³tonne⁻¹ VS added with a methane content of around 62%. The nitrogen in the food waste input was on average 8.9kgtonne⁻¹. This led to a high ammonia concentration in the digester which may have been responsible for the accumulation of volatile fatty acids that was also observed.
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