Abstract
Anaerobic digestion of piggery wastes as a primary method of purification was studied in laboratory-scale (15 l.) heated, stirred digesters. It was impossible to obtain a balanced digestion by fermentating undiluted faeces-urine slurry, but balanced fermentations could be built up in digesters originally seeded from a working domestic anaerobic digester or in digesters filled with water to which small amounts of waste were regularly added. The results from running two digesters for over 80 weeks at loading rates from 0·03 to 0·20 lb VSS ft −3 capacity day −1 are given, and it is concluded that the anaerobic digestion of piggery wastes is possible and that improvement in the waste is obtained, but that there may be an upper limit to the solids content of the digester input. A secondary aerobic treatment of the settled anaerobic digester output improves the liquid.
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