The effect of aeration rate on forced-aeration composting of chicken manure and sawdust.
The composting of chicken manure and sawdust has been investigated in forced-aeration composting systems at aeration rates of 0.3, 0.5, and 0.7 l min(-1)kg(-1) organic matter (OM), corresponding to pile A, pile B, and pile C. The temperature exceeding 55 degrees C in pile A and pile B remained more than three consecutive days, but only 2 days were above 55 degrees C in pile C. The final electrical conductivity (EC) did not exceed the limit content of 3000 micros cm(-1) in the three piles, and the cation exchange capacity (CEC) met the requirement maturity degree of over 60 c mol kg(-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 NH(4)(+)-N content in pile A did not meet the limit value of 400 mg kg(-1), respectively, and the NO(3)(-)-N was 1942, 2190, and 1638 mg kg(-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%.
Gao
Mengchun
M
Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, PR China. mengchungao@hotmail.com
Li
Bing
B
Yu
An
A
Liang
Fangyuan
F
Yang
Lijuan
L
Sun
Yanxia
Y
D000641:Ammonia / Q000737:chemistry; D000818:Animals; D001420:Bacteria, Aerobic; D001673:Biodegradation, Environmental; D002244:Carbon / Q000737:chemistry; D002645:Chickens; D004553:Electric Conductivity; D006863:Hydrogen-Ion Concentration; D008372:Manure; D009566:Nitrates / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D013696:Temperature; D013997:Time Factors; D014934:Wood
D008372:Manure; D009566:Nitrates; D002244:Carbon; D000641:Ammonia; D009584:Nitrogen