慢滤对二级出水中条件致病菌和有机物的去除效能及机制  

The Removal Efficiency and Mechanisms of Opportunistic Pathogens and Organic Matters in the Secondary Effluent by Slow Filtration

作　　者：孙丽华[1] 张钼晞 朱珺瑶 郗梓瑄 SUN Li-hua;ZHANG Mu-xi;ZHU Jun-yao;XI Zi-xuan(Key Laboratory of Urban Rainwater System and Water Environment,Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;School of Environmental and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Dongcheng District Commission of Housing and Urban-rural Development of Beijing City,Beijing 100062,China)

机构地区：[1]北京建筑大学城市雨水系统与水环境教育部重点试验室,北京100044 [2]北京建筑大学环境与能源工程学院,北京100044 [3]北京市东城区住房和城市建设委员会,北京100062

出　　处：《中国农村水利水电》2023年第12期85-93,共9页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(52070011);北京建筑大学研究生创新项目(PG2023066)。

摘　　要：采用慢滤作为深度处理工艺,探究其在不同运行条件下(进水碳氮比、pH值)对二级出水中条件致病菌(铜绿假单胞菌、军团菌和鸟分枝杆菌)和有机物的去除效能,并分析慢滤表面微生物的群落结构及其对水中条件致病菌的去除机制。结果表明,在不同运行条件下,生物膜慢滤对条件致病菌和有机物的去除效果均大于无生物膜慢滤,当碳氮比为10和pH值为7时,生物膜慢滤对上述污染物的去除效果最佳,且水中DOC浓度与条件致病菌含量均呈正相关性;在进水碳氮比为10时,滤料表面生物膜中根瘤菌属、浮霉菌属等优势菌属的占比较大;当进水pH值为7时,硝化螺旋菌属和变形菌属等优势均属的占比更大;生物膜中的硝化螺旋菌、根瘤菌、拟杆菌和酸杆菌均对条件致病菌的生长起到一定抑制的作用,有利于条件致病菌的削减。In recent years,the problem of water shortage has gradually become prominent,and to solve the contradiction between the supply and demand of drinking water resources,the development,and utilization of unconventional water source is especially important.The sec⁃ondary effluent of the sewage treatment plant can be used as an unconventional water source for drinking water reuse through an advanced treatment.The removal methods of pathogenic microorganisms in the secondary effluent include disinfection,advanced oxidation,media fil⁃tration,and membrane filtration.Slow filtration is employed as an advanced treatment way to examine its efficacy in removing opportunistic pathogens(OPs)and dissolved organic carbon(DOC)from the secondary effluent under various operating circumstances(C/N and pH of influent).Additionally,the OPs removal mechanism of slow filtration and the community structure of microorganisms on its surface are studied.The results demonstrate that slow filtration with biofilm is superior to slow filtration without biofilm in eliminating OPs and DOC under differ⁃ent operating conditions.Under different influent C/N conditions,the increase in C/N helps to improve the removal effect of biofilm slow fil⁃tration on OPs,while too high C/N would inhibit the removal of OPs,and the removal effect is greater than that of without biofilm slow filtra⁃tion,and the optimal C/N is 10,and the removal rates of Pseudomonas aeruginosa,Legionella and Mycobacterium avium are 91.2%,94.8%,and 93.1%,respectively.Under different influent pH conditions,the removal effect of biofilm slow filtration on OPs in water is great⁃er than that of biofilm slow filtration effluent,and when the influent water is neutral(pH=7),biofilm slow filtration has the best removal ef⁃fect on OPs,and the removal rates of OPs under the above conditions are 87.0%,91.3%,and 84.1%,respectively.Under different influent C/N conditions,the removal effect of biofilm slow filtration on DOC is better than that of no biofilm slow filtration,and the rem

关 键 词：二级出水 慢滤 条件致病菌 有机物 运行条件 

分 类 号：X52[环境科学与工程—环境工程]