J.of Soc of Agri Struc, Japan.
Vol.19,No.1 July 1988,5-9
Original:
Language: Japanese

    This paper concerns an anaerobic digestion for mechanical separated daiey cattle manure by the method of a batch operation. The operating temperatures are 20, 25, 30, 35, 40, 45 and 48 centigrade. The results obtained are summarized as follows:
1) The decomposition velocity (rate) of organic matter is strongly inflaenced by the operating temperature, but the organic matter concentration at the end of the digestion (VS-min, COD-min) is not affected by it.
Initial VS and COD are 3.8% and 52.2 g/l respectively, whereas VS-min and COD-min are 2.3 - 2.6% and 33.7-37.6 g/l respectively.
2) About 42-45%, by weight, of organic matter in the liquid manure is decomposed during digestion at these operating temperatures.
3) The largest volume of CH₄ gas per decomposed volatile solid (VS) is produced at 25-30 centigrade in this test. This result implies the existence of utility valuable bacteria at a temperature lower than 35 centigrade, the standard thermophilic operating temperature.
4) The operating temperature had no inflaence on the pH value at the end of the digestion period.

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