UV-NaClO顺序消毒对污水中大肠菌群的灭活效果  

Inactivation of coliforms in wastewater by UV-NaClO disinfection

作　　者：周琳 李子浩 李沛卓 杨强[1] 高爱丽[1] 程丽华[1,2] 毕学军 ZHOU Lin;LI Zihao;LI Peizhuo;YANG Qiang;GAO Aili;CHENG Lihua;BI Xuejun(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266033,China;State and Local Engineering Center of Urban Sewage Treatment and Recycling,Qingdao 266033,China)

机构地区：[1]青岛理工大学环境与市政工程学院,青岛266033 [2]城镇污水处理与资源化国家地方联合工程中心,青岛266033

出　　处：《环境工程学报》2022年第10期3213-3220,共8页Chinese Journal of Environmental Engineering

基　　金：山东省自然科学基金项目(ZR2020ME223);青岛西海岸新区科技攻关“揭榜”专项(2020-25)。

摘　　要：紫外(UV)和次氯酸钠(NaClO)消毒广泛应用于城市污水处理中,但目前2种消毒方式均存在不足。为实现既可高效消毒又能同时降低消毒所带来负面影响的目的,通过对比研究,分析了达到与UV或NaClO相同的消毒效果时,紫外-次氯酸钠(UV-NaClO)顺序消毒所需的消毒剂量以及UV-NaClO顺序消毒对微生物复活和消毒副产物(DBPs)生成的影响。结果表明:当UV剂量为9 mJ·cm^(−2),NaClO投加量为3、4和10 mg·L^(−1)时,UVNaClO顺序消毒可达到与单独UV消毒时(剂量为12、20或60 mJ·cm^(−2))以及单独NaClO消毒时(NaClO投加量为4、10或20 mg·L^(−1))的相同消毒效果;且当需要的微生物灭活效率越高时,UV-NaClO顺序消毒的优势越明显。同单独UV消毒相比,UV-NaClO顺序消毒后微生物的光复活率和暗修复率明显降低。当达到与单独NaClO消毒相同的微生物灭活效果时,UV-NaClO顺序消毒可有效降低DBPs的生成量,例如完全灭活E.coli,采用UVNaClO顺序消毒,DBPs的生成量可较单独NaClO消毒降低了76.87%。本研究可为污水排放与再生利用消毒技术的选择提供参考。Ultraviolet(UV)and sodium hypochlorite(NaClO)disinfection are widely used in wastewater treatment,but both disinfection methods have deficiencies.In order to achieve efficient disinfection while reducing the negative impact of disinfection,a comparative study was conducted to analyze the disinfectant amount required for combined UV-NaClO disinfection with the same disinfection effect as UV or NaClO and the effect of UV-NaClO disinfection on microbial reactivation and disinfection by-products(DBPs)formation.The results showed that at UV dosage of 9 mJ·cm^(−2) and NaClO dosages of 3,4 and 10 mg·L^(−1),UV-NaClO disinfection was as effective as UV disinfection alone at UV dosages of 12,20 or 60 mJ·cm^(−2) and NaClO disinfection alone at NaClO dosages of 4,10 or 20 mg·L^(−1).The higher the desired microbial inactivation efficiency,the more obvious the advantages of UV-NaClO disinfection.Compared to UV disinfection alone,UV-NaClO disinfection showed significantly lower rates of microbial photo-reactivation and dark repair.Achieving the same microbial inactivation effect as NaClO disinfection alone,UV-NaClO disinfection could effectively reduce the production of DBPs,for example,achieving complete inactivation of E.coli,the production of DBPs decreased by 76.87%using UV-NaClO disinfection compared with NaClO disinfection alone.This study can provide a theoretical basis for the selection of disinfection technology for wastewater discharge and recycling.

关 键 词：紫外 次氯酸钠 消毒 大肠菌群 复活 消毒副产物 

分 类 号：X703.1[环境科学与工程—环境工程]