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Journal of Biological Sciences

Year: 2015 | Volume: 15 | Issue: 1 | Page No.: 40-44
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Authors

Yusuke Kajiya

Yasuyuki Ishii

Kiichi Fukuyama

Sachiko Idota

Keywords

Research Article

Precise Optimization of Poultry Manure Composting Using an Experimental Small-Scale Apparatus

Yusuke Kajiya, Yasuyuki Ishii, Kiichi Fukuyama and Sachiko Idota
Ordinary stacked composting from bovine and poultry manures requires large amounts of materials and it is difficult to conduct uniform and repeated processing. While precise optimization using bovine manure and an experimental small-scale apparatus (Kaguyahime) has already been accomplished, poultry manure has readily decomposable components compared to bovine manure. The objective of this study was to determine the precise optimization of poultry manure composting using the same small-scale apparatus, filled with 7 kg of manure that was dried under sunlight and different amounts of sawdust as subsidiary material. In the preliminary experiment, the maximum temperature for the first 7 days of composting reached over 60°C when the moisture content of the mixture decreased below 65%, while the manure-to-sawdust ratio negligibly affected the temperature increase. Under the preliminary conditions, the maximum temperature of poultry manure mixed with sawdust was over 70°C within 2 days after composting and the thermophile phase above 60 and 55°C continued for an additional 27 and 18 h, respectively. The pH and electrical conductivity of poultry manure composted for 32 days remained at 9.1 and 6.6 mS cm‾1, respectively, which indicates the manure is safe for land application.
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