给水厂耐氯菌风险控制技术研究与应用示范

Research and application demonstration of chlorine-resistant bacteria risk control technology in water treatment plant

针对给水厂面临的以芽孢杆菌为代表的耐氯菌问题,以全面提升饮用水供水水质安全为目标,研发建立了集强化常规处理、深度处理、紫外-氯联合消毒于一体的全流程耐氯菌控制技术,同时兼顾氯化消毒副产物三氯乙醛的控制,并在深圳市某水厂进行工程示范。示范技术应用后,出厂水中耐氯菌(菌落总数)检出率降低了23.50%,总大肠菌群、耐热大肠菌群、大肠埃希氏菌、贾第鞭毛虫、隐孢子虫等微生物指标均未检出,三氯乙醛平均浓度下降了59.33%,实现了微生物指标和消毒副产物指标的协同控制。此外,其他水质指标同时满足《生活饮用水卫生标准》(GB 5749-2006)和深圳市地方标准《生活饮用水水质标准》(DB 4403/T60-2020)的要求。示范技术的开发与应用,可为我国饮用水安全保障提供支撑,并为国内类似水质问题的解决提供借鉴。

Faceing the problem of chlorine-resistant bacteria represented by bacillus in water treatment plants,the control technology of chlorine-resistant bacteria in the whole process was established,which integrated the enhanced conventional treatment process,advanced treatment process and UV combined with chlorine disinfection process,in order to comprehensively improve the drinking water safety.Meanwhile,chloral hydrate(CH),one of chlorination disinfection byproducts(DBPs),was controlled,and the technology demonstration was carried out in a water plant in Shenzhen.After the demonstration technology was applied,the detected rate of chlorineresistant bacteria(the total number of colonies)in finished water was decreased by 23.5%,and other microbial indicators,including total coliform,heat-resistant coliform,Escherichia coli,Giardia and Cryptosporidium,were not detected.In addition,the average concentration of CH was decreased by 59.33%,and thus the coordinated control of microbial index and DBPs was released.Moreover,other water quality indexes also met the requirements of the Standard for Drinking Water Quality(GB 5749-2006)and the Standard of Drinking Water Quality(DB 4403/T60-2020),the local standard in Shenzhen.The development and application of demonstration technology provide a strong support for the drinking water quality security of China,and provide a reference for the solution of similar water quality problems in China.