紫外线-茶多酚联用对供水管网的消毒效果

针对传统消毒技术的安全风险问题，以维护供水管网水质安全为目标，引入茶多酚作为辅助消毒剂和紫外线消毒联用，模拟供水管网系统探究不同管材和水力停留时间下紫外线-茶多酚联合消毒的消毒效果，分析管壁生物膜形貌和菌落分布的变化.结果表明，75mg/L是紫外线-茶多酚联合消毒时茶多酚的较优投加量，可保持48h消毒效果.模拟管网运行过程中整体水质较好，但管材对管网消毒效果的影响较大，30d内球墨铸铁和UPVC管网中细菌量超过100CFU/mL的频率分别为80%和0%，紫外线-茶多酚联合消毒在UPVC管网中消毒持续性较强.与紫外线消毒相比，紫外线-茶多酚联合消毒对管壁生物膜的破坏效果更明显，且对生物膜中的蓝藻菌和肠道致病菌杀灭效果更强，有利于保障管网水质的安全性.

Effect of combined disinfection using ultraviolet and tea polyphenols in network

To reduce the security risks of traditional ultraviolet (UV) disinfection technology alone, tea polyphenols (TP) was used in conjunction with UV disinfection. The effects of UV-TP combined disinfection and the changes of biofilm and bacterial community structure were investigated using a simulated water supply network composing different pipe materials and hydraulic retention times. The results showed that 75mg/L was a better dosage of tea polyphenols when combined with UV disinfection,which can maintain the disinfection effect for 48hours. The quality of treated water remained better in the testing process of the simulated system, but the pipe material had a greater impact on the disinfection effect of the pipe network. The frequency of bacteria exceeding 100CFU/mL in the ductile iron (DI) and unplasticized polyvinyl chloride (UPVC) pipe network within 30days were 80% and 0%, respectively. UV-TP combined disinfection in the UPVC pipe network has a relatively strong disinfection.Compared with UV disinfection alone, UV-TP combined disinfection resulted in a reduced rate of biofilm build up and is more effective in inactivation of Cyanobacteria and intestinal pathogens, which is beneficial to ensure the required quality of the water supply network.