氨氮浓度对鸡粪中高温甲烷发酵的影响  

Effects of ammonium on methane fermentation of chicken manure under mesophilic and thermophilic conditions

作　　者：乔玮[1,2] 毕少杰 熊林鹏 鞠鑫鑫 董仁杰 QIAO Wei;BI Shao-jie;XIONG Lin-peng;JU Xin-xin;DONG Ren-jie(R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee, College of Engineering,China Agricultural University, Beijing 100083, China;Institute of Yantai, China Agricultural University, Yantai 264670, China;Shandong Zhongnong Sanyue Environmental Protection Technology Corporation Limited, Yantai 264670, China)

机构地区：[1]中国农业大学工学院,国家能源生物燃气高效制备及综合利用技术研发(实验)中心,北京100083 [2]中国农业大学烟台研究院,山东烟台264670 [3]山东中农三月环保科技股份有限公司,山东烟台264670

出　　处：《中国环境科学》2019年第7期2921-2927,共7页China Environmental Science

基　　金：北京市自然科学基金资助项目(6182017)

摘　　要：为探究氨氮浓度对鸡粪中高温甲烷发酵的影响,采用固定水力停留时间(HRT,20d),提高进料总固体浓度(TS,5%、7.5%和10%)的方式增加氨氮浓度,通过265d的长期甲烷发酵试验,比较了不同氨氮浓度条件下鸡粪中高温甲烷发酵效果和污泥的比产甲烷活性.结果显示,TS由5%增至10%,中高温反应器中氨氮浓度由2.1~2.5g/L增至6.1~6.5g/L,对应的比产甲烷活性分别降低了44%和100%,中温反应器中挥发性脂肪酸由0.4g/L增至7.6g/L,甲烷产率由253mL/gTS降至203mL/gTS;高温反应器中挥发性脂肪酸由0.4g/L增至26.1g/L,甲烷产率由181mL/gTS降至18mL/gTS.氨氮浓度对高温甲烷发酵系统的抑制作用更加明显.In order to explore the effect of total ammonium nitrogen(TAN)on mesophilic and thermophilic anaerobic digestion of chicken manure,the performances of anaerobic digestion of chicken manure under mesophilic and thermophilic conditions were compared through 265 days’experiment with the increased TAN when the feed total solid(TS)increased from 5%to 7.5%and 10%.During the operation,the specific methanogenic activity(SMA)test was carried out with sodium acetate.The TAN in the mesophilic and thermophilic reactors increased from 2.1~2.5to 6.1~6.5g/L when TS increased from 5%to 10%.The SMAs of the mesophilic and thermophilic reactors reduced by 44%and 100%,respectively,resulting in a decrease in the ability of the fermentation system to produce methane by acetic acid.In the mesophilic reactor,the methane yield reduced from 253 to 203 mL/gTS,associated with the accumulation of volatile fatty acids(VFAs)from 0.4 to 7.6g/L.The methane yield decreased from 181to 18mL/gTS when the VFA increased from 0.4 to 26.1g/L in the thermophilic reactor.The effect of TAN on reducing methane yield was more obvious under thermophilic condition.

关 键 词：氨氮浓度 进料浓度 鸡粪 甲烷发酵 

分 类 号：X705[环境科学与工程—环境工程]