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| Effect of feed concentration on long-term thermophilic methane fermentation of chicken manure |
| QIAO Wei1,2,3, BI Shao-jie1,2, XIONG Lin-peng1,2, REN Zheng-ran1,2, DONG Ren-jie1,2,3 |
1. College of Engineering, China Agricultural University, Beijing 100083, China;
2. R & D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee(BGFeuls)(China Agricultural University), Beijing 100083, China;
3. Institute of Yantai, China Agricultural University, Yantai 264670, China |
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Abstract Effect of improved feed concentration, which lead to ammonium accumulation, on chicken manure methane fermentation under thermophilic condition (55±1)℃was investigated by using an integrated approach in a laboratory-scale semi-continuously stirred tank reactors. The reactor operated for 267days at a fixed hydraulic retention time of 20days, with feed concentration based on total solid increased from 5.0% to 7.5% and 10.0%. With feed concentration increased from 5.0% to 10.0%, the ammonia concentration increased from (2.5±0.3) g/L to (6.1±0.2)g/L, the volatilized fatty acids (VFAs) increased from (0.4±0.1)g/L to (26.1±1.5)g/L, when pH value, biogas production rate and methane content dropped from (8.3±0.2) to (6.9±0.1), from (267.2±12.5)mL/g TSin to (49.8±8.2)mL/g TSin and from (67.2±1.3)% to (36.0±1.7)%, respectively. The highest ammonia concentration of 7.5g/L and highest VFAs concentration of 27.0g/L were achieved at 197th day when the feed concentration elevated to 10.0%, causing obvious inhibition on methane fermentation system. The effect of ammonia accumulation on biogas production and VFAs accumulation was analyzed using the method of linear cumulative effect. It was said that the initial ammonia concentration of 2.5~3.0g/L will inhibit the thermophilic digestion of chicken manure. The biogas production would be decrease or ceased when the feed concentration greater than 7.5%. During the operation, the specific methanogenic activity (SMA) test was carried out with sodium acetate as substrates. At feed TS concentration of 7.5% and 10%, ammonia concentration of 5.5 and 7.0g/L caused a drop in SMA by 56.0% and 100%, respectively.
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Received: 30 November 2017
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