HRT对餐厨垃圾与秸秆混合高温厌氧发酵的影响  

Effect of hydraulic retention time on thermophilic anaerobic co-digestion of food waste and straw

作　　者：乔玮[1] 尹冬敏[1] 刘月玲[1] 毕少杰 王菁 董仁杰[1] QIAO Wei;YIN Dong-min;LIU Yue-ling;BI Shao-jie;WANG Jing;DONG Ren-jie(R & D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee Biomass Engineering Center, College of Engineering, China Agricultural University, Beijing 100083, China)

机构地区：[1]中国农业大学工学院,生物质工程中心,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

出　　处：《中国环境科学》2017年第12期4596-4604,共9页China Environmental Science

基　　金：北京市科技计划课题(D1611000016003,D1611000016001,Z151100001115010);“十三五”国家重点研发计划课题(2016YFD0501403)

摘　　要：以餐厨垃圾和秸秆(按TS比1:1混合)为原料,水力停留时间(HRT)逐级递减至5,3,1.5,1,0.5d,对应有机负荷(OLR)依次为8.0,6.66,3.33,5.0,5.0g VS/(L?d),开展了55d的连续高温发酵试验,并对微生物组成进行分析.实验发现,当HRT由5d缩短到1d的过程中,反应器运行稳定,OLR,挥发性固体(VS)去除率,产气率和容积产气率均维持在较高水平.当HRT降至0.5d时,pH值稳定在7.0左右,并未出现VFA累积,但反应器几乎停止产气,VS去除率仅为5.77%,微生物发生冲刷流失.高通量测试结果表明,当HRT为0.5d时,体系内嗜氢产甲烷菌的比例增加,嗜乙酸产甲烷菌降至0.6%,而Clostridiales等能够与产甲烷菌共生的水解酸化细菌的比例增加了近1倍,推测乙酸氧化菌与嗜氢产甲烷菌共生是乙酸产甲烷的主要途径.A continuous anaerobic co-digestion experiment of55days was carried out under the condition of55℃by using a mixture feeding of8%in total solid(TS).Food waste mixed with straw(TS of1:1)was used as feeding materials,and the hydraulic retention time(HRT)was set at5,3,1.5,1and0.5days.Corresponding with OLR were8.0,6.66,3.33,5.0and5.0g VS/(L?d).Then,the microbial composition was analyzed.When the HRT was shortened from5d to1d,the reactor was stable.The OLR,VS removal rate,gas production rate and volumetric gas production rate were maintained at a high level.When the HRT was reduced to0.5d,the pH was stable at about7.0,and VFA was not overload.But the reactor almost stopped producing gas.The VS removal rate was only5.77%,the microbial was loss.At the same time,high-throughput test results showed that,when HRT was0.5d,the proportion of Hydrogenated methanogens increased,acetoclastic methanogenesis were down to0.6%,and the proportion of acetogenesis bacteria like Clostridiales increased nearly,acetic acid oxidase and hydrogentrophic methanogenic bacteria may be the main pathway of acetic acid utilization.

关 键 词：水力停留时间 餐厨垃圾 秸秆 高温厌氧发酵 

分 类 号：X712[环境科学与工程—环境工程]