Anaerobic digestion characteristics of pig manures depending on various growth stages and initial substrate concentrations in a scaled pig farm in Southern China.
The characteristics of anaerobic digestion of pig manure from different growth stages were investigated. According to growth stage, batch experiments were performed using gestating sow manure (GSM), swine nursery with post-weaned piglet manure (SNM), growing fattening manure (GFM) and mixed manure (MM) as substrates at four substrate concentrations (40, 50, 65 and 80gVS/L) under mesophilic conditions. The maximum methane yields of MM, SNM, GSM and GFM were 354.7, 328.7, 282.4 and 263.5mLCH4/gVSadded, respectively. Volatile fatty acids/total inorganic carbon (VFA/TIC) ratio increased from 0.10 to 0.89 when loading increased from 40 to 80gVS/L for GFM. The modified Gompertz model shows a better fit to the experimental results than the first order model with a lower difference between measured and predicted methane yields. The kinetic parameters indicated that the methane production curve on the basis of differences in biodegradability of the pig manure at different growth stages.
College Agriculture and Biotechnology, China Agricultural University, Beijing 100093, People's Republic of China; College of Engineering, China Agricultural University, Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture, Beijing 100083, People's Republic of China.
Wanqin
W
Zhang
College Agriculture and Biotechnology, China Agricultural University, Beijing 100093, People's Republic of China.
Qianqian
Q
Lang
College of Engineering, China Agricultural University, Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture, Beijing 100083, People's Republic of China. Electronic address: wushubiao@gmail.com.
Shubiao
S
Wu
College of Engineering, China Agricultural University, Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture, Beijing 100083, People's Republic of China.
Wei
W
Li
College of Engineering, China Agricultural University, Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture, Beijing 100083, People's Republic of China; Institute Superior Agronomy and Veterinary of Faranah (ISAV/F), Faranah 131, Guinea.
Hamidou
H
Bah
College of Engineering, China Agricultural University, Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture, Beijing 100083, People's Republic of China.
Renjie
R
Dong
D000693:Anaerobiosis; D000822:Animal Husbandry; D000818:Animals; D001673:Biodegradation, Environmental; D002681:China; D007700:Kinetics; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000378:metabolism; D008962:Models, Theoretical; D012037:Refuse Disposal / Q000379:methods*; D013552:Swine / Q000254:growth & development*
D008372:Manure; D008697:Methane
Anaerobic digestion; Growth stage; Kinetic study; Pig manure