新冠肺炎疫情期间城镇再生水厂协同消毒工艺运行实践  

Practice of synergistic disinfection process in water reclamation plants during COVID-19 epidemic

作　　者：李魁晓[1] 时玉龙 于丽昕[1] 蒋勇[1] 王军静 李烨[1] 白宇[1] 刘垚[1] Li Kuixiao;Shi Yulong;Yu Lixin;Jiang Yong;Wang Junjing;Li Ye;Bai Yu;Liu Yao(Beijing Drainage Group Co.Ltd.,Beijing 100022,China)

机构地区：[1]北京城市排水集团有限责任公司,北京100022

出　　处：《给水排水》2020年第4期48-53,共6页Water & Wastewater Engineering

摘　　要：基于新冠病毒存在介水传播的风险,结合北京城市污水再生利用实践,对疫情期间污水再生处理与协同消毒工艺实际运行效果进行研究。结果表明:根据已有研究结果,新冠病毒在水环境中的存活能力及对消毒剂耐受力均弱于粪大肠菌群,在城市污水处理过程中粪大肠菌群可以用来参考指示新冠病毒的灭活。二级处理与深度处理单元的稳定运行,使消毒工艺进水SS<5mg/L,有效保障了后续消毒单元的消毒效果。对于臭氧-NaClO协同消毒工艺,臭氧剂量维持在3~5mg/L,NaClO剂量根据水量与清水池容积维持CT值不低于8mg·min/L,可以稳定实现出水粪大肠菌群<2CFU/L的消毒效果,同时节省NaClO投加量。对于臭氧-UV-NaClO协同消毒工艺,1~3 mg/L的臭氧投加量能够将紫外透射率提升30%,在设计紫外剂量下(景观用水30mJ/cm^2,城市杂用水80mJ/cm^2),能够达到紫外出水粪大肠菌群<2CFU/L;后续根据再生水用途及管网输配要求进行补氯,保障出水余氯达到相应标准。协同消毒工艺通过不同消毒技术的合理选择与运行优化,可以实现粪大肠菌群99.99%以上的去除,出水粪大肠菌群<2CFU/L,出水余氯浓度稳定可控,保障了再生水与受纳水体安全。Due to the risk of 2019-nCoV virus transmission via sewerage systems,the performances of secondary and advanced treatment processes,especially the synergistic disinfection process of water reclamation plants were investigated,based on the practices of wastewater treatment and reuse in Beijing.The results showed that the viability of 2019-nCoV virus in water and its resistance to disinfectants were both weaker than fecal coliforms.The fecal coliforms can be used as a surrogate indicator for the inactivation of 2019-nCoV virus during wastewater treatment processes.After secondary and advanced treatment,the suspend solid and turbidity of effluent were below 5 mg/L and 2 NTU constantly,which greatly guaranteed the smooth operation of subsequent disinfection units.For the O3-NaClO synergistic disinfection process,the ozone dose was maintained at 3~5 mg/L,and the CT values for NaClO disinfection was maintained>8 mg·min/L.The number of fecal coliforms after NaClO disinfection was always below 2 CFU/L.For the O3-UV-NaClO synergistic disinfection process,pre-ozonation at ozone dosage of 1~3 mg/L improved the UV transmittance by 30%at 254 nm.Subsequently,at UV design dose of 30 mJ/cm2 for scenic environment use and 80 mJ/cm2 for non-potable urban use respectively,the number of fecal coliforms after UV disinfection was also kept below 2 CFU/L.And the final chorine dosage most depended on the specific application of reclaimed water or the requirements of distribution network.Through optimizing of the bi-and tri-synergistic disinfection processes,the number of fecal coliforms in product reclaimed water was below 2 CFU/L with a stable chlorine residual.The synergistic disinfection processes play a significant role in ensuring the safety of reclaimed water and its receiving environment.

关 键 词：新冠病毒 城镇再生水厂 病原微生物 协同消毒 

分 类 号：TU992[建筑科学—市政工程]