Effects of adding slaked lime on composting anaerobically stored swine manure
2004
Takahashi, M. (Ishikawa-ken. Animal Husbandory Experiment Station, Oshimizu (Japan)) | Masaki, S.
This study aimed to clarify the problems of composting swine manure that has been stored under anaerobic conditions and also to examine the effects of adding slaked lime on composting. Result showed that the longer the anaerobic storage period is, the higher the level of VFA (especially n-butyric acid and n-valeric acid). During 7 days of anaerobic storage, the dry matter in swine manure disappeared by 6 % while the moisture content increased by 1.5%. The swine manure that had been stored for 7 days under anaerobic conditions was mixed with rice hull to adjust the moisture level to about 60% and afterwards it was aerated. However, the maximum temperature reached 30 deg C two days later and soon after the temperature started dropping. During the rest of the test period, the temperature did not rise any more, nor were there any signs of compost fermentation. Although the level of acetic acid increased substantially during the test period, n-butyric acid disappeared. The result of adding slaked lime into swine manure and then aerating it showed signs of compost fermentation. The suitable amount of added slaked lime was 1.0% per matter. Adding slaked lime facilitated the organic matter decomposition.
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