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Abstract
A fixed film digester with a 35 litre support void volume, treating piggery waste at 35°C, was capable of handling high organic loading rates and short hydraulic retention times without process failure. The digester had a film support made of fired potter's clay and a surface-to-volume ratio of 157 m 2m −3. It could be loaded to 18·7 kg Volatile Solids (VS) m −3 day −1 without substantial increases in volatile acid levels or a reduction in the quality of the digester gas. Maximum methane gas production was 3·8 m 3 (STP) m −3 day −1 and the conversion of Volatile Solids into methane decreased with decreasing hydraulic retention time.
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