臭氧对生物活性炭中微生物及出水消毒副产物的影响  

Effect of Ozonation on Microorganism in the Biological Activated Carbon and Disinfection By-Products in the Effluent

作　　者：刘宝明 王夕希 张晓夏 顾艳芳 李雨平 阮文权[1,2,3] 缪恒锋 潘杨[4] LIU Bao-ming;WANG Xi-xi;ZHANG Xiao-xia;GU Yan-fang;LI Yu-ping;RUAN Wen-quan;MIAO Heng-feng;PAN Yang(School of Environmental and Civil Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Anaerobic Biotechnology,Wuxi 214122,China;Jiangsu Engineering Laboratory of Biomass Energy and Carbon Reduction Technology,Wuxi 214122,China;Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou 215009,China)

机构地区：[1]江南大学环境与土木工程学院,无锡214122 [2]江苏省厌氧生物技术重点实验室,无锡214122 [3]江苏省生物质能与减碳技术工程实验室,无锡214122 [4]江苏省水处理技术与材料协同创新中心,苏州215009

出　　处：《环境科学》2020年第1期253-261,共9页Environmental Science

基　　金：江苏省环境科学与工程重点实验室开放基金项目(Zd20170X)

摘　　要：为探究饮用水处理过程中臭氧(O3)对生物活性炭(BAC)中微生物及出水消毒副产物(DBPs)的影响,以饮用水小试装置的O3-BAC工段开展研究,系统分析在不同O3浓度下的水质变化,溶解性有机物(DOM)特征,微生物活性和DBPs产生情况.结果表明,O3对BAC过滤的影响主要表现为提升微生物对DOM的利用效率,但O3浓度过高会导致出水中蛋白质和微生物代谢产物(SMPs)等有机物增加.当O3浓度从0 mg·L-1提升到2. 0 mg·L-1时,BAC中微生物存活率从95. 10%降至62. 60%,但O3将出水中难降解有机物转变为易生物降解物质,使得微生物活性提高了62. 52%,BAC的生物过滤得到强化;当O3浓度增加到4. 0 mg·L-1时,微生物存活率降至49. 90%,同时微生物产生的蛋白质和SMPs增加,导致含碳消毒副产物(CDBPs)和含氮消毒副产物(N-DBPs)的生成浓度与不通O3相比分别上升41. 93%和7. 18%,大大增加水体潜在危险.综上,合适O3浓度有利于O3-BAC对DOM的去除,O3浓度过高会导致BAC过滤效果变差并产生新的DBPs前体物.This study was carried out in the ozone( O3) and biological activated carbon( BAC) section of a drinking water plant to investigate the effects of O3 on microbial and effluent disinfection by-products( DBPs) in BAC during drinking water treatment. The water quality,dissolved organic matter( DOM) characteristics,microbial activity,and DBPs formation at different O3 concentrations were analyzed. Results showed that the effect of O3 on microorganisms is mainly that it increased the utilization efficiency of DOM.However,excessive O3 increased the amount of organic matter such as protein and microbial metabolites( SMPs) in the effluent. When the O3 concentration increased from 0 mg·L-1 to 2. 0 mg·L-1,the survival rate of microorganisms in the BAC decreased from 95. 10%to 62. 60%. However,since O3 transforms organic matter into a biodegradable substance,we found that microbial activity increased by62. 52% and that the biofiltration of the BAC was enhanced. When the O3 concentration was further increased to 4. 0 mg·L-1,the microbial survival rate decreased to 49. 9% and the protein and SMPs produced by the microorganisms increased. This resulted in an increased formation of carbon-containing DBPs( C-DBPs) and nitrogen-containing DBPs( N-DBPs) by 41. 93% and 7. 18%,respectively. In summary,an appropriate dosage of O3 was beneficial for removing DOM by O3-BAC,but we found that an excessive O3 concentration caused the formation of new DBPs precursors.

关 键 词：臭氧 生物活性炭(BAC) 溶解性有机物 微生物 消毒副产物 

分 类 号：X131.2[环境科学与工程—环境科学]