Proceedings

EFFECT OF AEROBIC PROCESSING ON BIOGAS YIELD IN THE ANAEROBIC DIGESTION OF READILY BIODEGRADABLE WASTES

*Akunna J.C.,* Stewar N. A., and **Goldie P.
*Urban Water Technology Centre, School of Contemporary Science, University of Abertay, Dundee
**Waste Management Department, Dundee City Council,

(free)

This paper examines the effect of aerobic handling of readily biodegradable waste on biogas potential and solids reduction. Thermophilic anaerobic digestion of mixed green and food waste yielded diminishing levels of biogas as the duration of initial aerobic phase was increased. An inverse exponential relationship between biogas potential and time in aerobic conditions was obtained; indicating that up to 50% of the biogas potential can be lost after only 4 days of pre-composting. In comparison with singlephase anaerobic digestion aerobic pretreatment, prior to digestion, marginally increased the level of solids destruction.

KEY WORDS Aerobic, anaerobic, biogas, composting, digestion, organic waste, thermophilic.

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