Effect Of Waste Type And Proportions On pH Control And Regulation In High Solids Anaerobic Digestion

Abdullahi, Y.A. and Akunna, J.C.
University of Abertay


This study investigated the effect of waste type and proportions on pH stability and breakdown of source-separated organic
solid waste. The ability of feedstock type to provide and sustain sufficient natural buffers in order to avoid addition of artificial
pH control chemicals was also assessed. Results showed that cultures containing food waste, green waste and anaerobic
sludge seed in the ratio 2:2:1 produced the highest biogas production and volatile solids destruction with pH stability when
compared with the performances of the other non-chemically buffered cultures studied. The results also revealed the
importance of waste type and proportions in natural pH control and regulation.

anaerobic digestion; biogas production; food waste; green waste; pH regulation

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