The effect of aeration rate on forced-aeration composting of chicken manure and sawdust
2010
Gao, Mengchun | Li, Bing | Yu, An | Liang, Fangyuan | Yang, Lijuan | Sun, Yanxia
The composting of chicken manure and sawdust has been investigated in forced-aeration composting systems at aeration rates of 0.3, 0.5, and 0.7lmin⁻¹ kg⁻¹ organic matter (OM), corresponding to pile A, pile B, and pile C. The temperature exceeding 55°C in pile A and pile B remained more than three consecutive days, but only 2days were above 55°C in pile C. The final electrical conductivity (EC) did not exceed the limit content of 3000μscm⁻¹ in the three piles, and the cation exchange capacity (CEC) met the requirement maturity degree of over 60cmolkg⁻¹. The OM loss contents in pile A, pile B, and pile C were 14%, 15.4%, and 12.8%, respectively, corresponding to the final C/N ratio of 17.1, 16.2, and 18.3. The final [formula removed]-N content in pile A did not meet the limit value of 400mgkg⁻¹, respectively, and the [formula removed]-N was 1942, 2190, and 1638mgkg⁻¹ in pile A, pile B, and pile C. The final germination index (GI) for pile A, pile B, and pile C was 90.2%, 95.2%, and 79.4%.
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