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| Effect of temperature changes on the performance of gas production at the start-up stage of chicken manure mesophilic temperature dry biogas fermentation |
| Received:March 30, 2018 |
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| KeyWord:chicken manure;dry fermentation;biogas;temperature;coenzyme F420 |
| Author Name | Affiliation | E-mail | | ZHOU Man | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China
College of Water Resource and Hydropower, Sichuan Agricultural University, Ya'an 625014, China | | | DENG Liang-wei | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | dengliangwei@caas.cn | | YANG Hong-nan | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | | | LIU Yi | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | | | PU Xiao-dong | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | | | CHEN Zi-ai | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | | | LI He-ping | College of Water Resource and Hydropower, Sichuan Agricultural University, Ya'an 625014, China | | | LI Yang-mei | College of Water Resource and Hydropower, Sichuan Agricultural University, Ya'an 625014, China | |
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| Abstract: |
| Semi-continuous experiments were carried out to study the effects of temperature changes on the gas production performance of mesophilic temperature dry biogas fermentation of chicken manure during the start-up phase. The temperature was decreased from 35℃ to 15, 20, 25℃ and 30℃, and then returned to 35℃ to conduct the start-up test of semi-continuous dry biogas fermentation of chicken manure to provide a scientific basis for the start of dry biogas fermentation. The results showed that the fermentation temperature affected the biogas production yield and methane content at the start-up stage. During the temperature change stage, the maximum biogas production rates at 15, 20, 25, 30℃, and 35℃ were 0.017, 0.126, 0.357, 0.442 L·L-1·d-1, and 0.493 L·L-1·d-1, respectively. The maximum methane production rates of raw material were 0.011, 0.074, 0.211, 0.261 L CH4·g-1VS, and 0.294 L CH4·g-1VS, respectively. Gas production performance of the 25℃ and 30℃ temperature conditions were more effective than that of the 15℃ and 20℃ temperature conditions. At startup, gas production yield decreased significantly with temperature changes; the greater the decrease, the greater the impact. The microorganisms used for biogas fermentation had some flexibility regarding temperature changing within a certain range; performance could be successfully restored within enough time, but the time of start-up stage was delayed. Changes in the concentration of dehydrogenase and coenzyme F420 reflected the changes in sludge activity during the temperature changes. There was a better linear correlation between coenzyme F 420 and methane yield. Our results indicated that the dry biogas fermentation of chicken manure at 35℃ could be started smoothly, and coenzyme F420 could be used as an indicator of sludge activity at the start-up stage of dry biogas fermentation. |
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