高pH条件下UASB反应器处理含硫酸盐废水的性能  

Performance of UASB system on treating sulphate containing wastewater under high pH condition

作　　者：何士龙[1] 刘静 陈燚 李瑞杰 朱家葆 HE Shilong;LIU Jing;CHEN Yi;LI Ruijie;ZHU Jiabao(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学环境与测绘学院,徐州221116

出　　处：《环境工程学报》2021年第2期501-511,共11页Chinese Journal of Environmental Engineering

基　　金：中央高校基本科研学科前沿科学研究专项基金(2019XKQYMS78)。

摘　　要：利用升流式厌氧活性污泥床(UASB)反应器处理高含硫有机废水,考察了其在pH=8.5条件下的运行性能、MPA(产甲烷菌)与SRB(硫酸盐还原菌)的竞争规律及微生物群落结构特征。结果表明:在pH=8.5的厌氧生物处理系统中,COD的去除率达到70%以上和硫酸盐去除量达到1600 mg·L^(−1),在整个运行期间均保持较好的性能;在COD/SO_(4)^(2-)为1~10时,MPA始终占有主导地位;在整个运行期间,水相中游离H_(2)S浓度最高仅为5.7 mg·L^(−1),沼气中的H_(2)S浓度处于较低水平(最高为1.5 mg·L^(−1))。系统中主要的耐碱性MPA为甲烷丝菌属、甲烷短杆菌、未分类甲烷杆菌科。由此可见,高pH可以有效解除游离态H_(2)S对MPA活性抑制,亦可减少沼气中的H_(2)S含量。A laboratory-scale up-flow anaerobic sludge blanket(UASB)was used and consciously operated at the high pH of 8.5 to investigate the removal performance on high sulfur organic wastewater in terms of the competitive rule between methane producing archaea(MPA)and sulfate-reducing bacteria(SRB)and the structure characteristics of microbial community.The results showed that UASB had a COD removal rate over 70%and sulfate removal of about 1600 mg·L^(−1)when the system was operated at the pH=8.5,which maintained a good performance during the operation.Although the ratio of COD to SO_(4)^(2-)(i.e.,COD/SO_(4)^(2-))was an important impact factor on the reactor performance,the MPA was still a dominant bacteria when COD/widely fluctuated from 1 to 10.At the whole operating stage,the concentration of free H_(2)S in aqueous was lower than 5.7 mg·L^(−1),and the concentration of H_(2)S in biogas was at a low level(≤1.5 mg·L^(−1)).The three main alkali-resistance MPAs were identified as Methanosaeta sp.,Methanobrevibacter and unclassified_f_Methanobacteriacea,respectively.Thus,high pH could contribute to take away the toxicity inhibition of free H_(2)S on MPA activity,and also reduce the content of H_(2)S in biogas,which can provide reference for high pH anaerobic treatment of sulfuric acid wastewater.

关 键 词：硫酸盐 高pH 微生物群落 耐碱性MPA 

分 类 号：X703[环境科学与工程—环境工程]