| 周曼,邓良伟,杨红男,刘刈,蒲小东,陈子爱,李和平,李扬眉.鸡粪中温干式沼气发酵启动阶段温度变化对产气性能的影响[J].农业环境科学学报,2018,37(8):1785-1792. |
| 鸡粪中温干式沼气发酵启动阶段温度变化对产气性能的影响 |
| Effect of temperature changes on the performance of gas production at the start-up stage of chicken manure mesophilic temperature dry biogas fermentation |
| 投稿时间：2018-03-30 |
| DOI：10.11654/jaes.2018-0415 |
| 中文关键词: 鸡粪 干发酵 沼气 温度 辅酶F420 |
| 英文关键词: chicken manure dry fermentation biogas temperature coenzyme F420 |
| 基金项目:国家重点研发计划项目（2016YFD0501403）；国家自然科学基金项目（31572450）；国家生猪技术产业体系（CARS-36-10B）；中央级公益性科研院所基本科研业务费专项（Y2018LM13） |
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| 中文摘要: |
| 采用半连续试验研究了鸡粪中温干式沼气发酵启动阶段，温度从35℃骤降至15、20、25℃和30℃并再次恢复至35℃过程中，温度变化对产气性能的影响，以期为干式沼气发酵的启动提供科学依据。结果表明：温度变化影响启动阶段沼气产量和甲烷含量，变温期间，15、20、25、30℃和35℃最大容积沼气产率分别为0.017、0.126、0.357、0.442 L·L-1·d-1和0.493 L·L-1·d-1；最大原料甲烷产率分别为0.011、0.074、0.211、0.261 L CH4·g-1VS和0.294 L CH4·g-1VS。对比35℃恒温发酵产气性能，温度骤降至15℃和20℃条件下运行的产气能力明显小于温度骤降至25℃和30℃条件运行的产气能力。温度变化幅度越大，产气性能受影响越大，沼气发酵微生物对一定温度变化范围具有一定的适应性，足够的时间范围内可以顺利恢复。在变温发酵启动过程中，相比脱氢酶，辅酶F420浓度变化和甲烷产率之间具有更好的线性相关性。研究表明：鸡粪35℃中温干式沼气发酵可以顺利启动，但温度变化导致厌氧干发酵启动时间延长。辅酶F420可以作为反映干式沼气发酵启动阶段污泥活性变化的指标。 |
| 英文摘要: |
| 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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