化学氧化和砂滤对净水工艺中颤蚓污染的协同控制

Cooperative controlling effects of chemical oxidation and sand filter on Tubifex tubifex pollution in drinking water treatment process

为实现对净水工艺中蠕虫污染的高效控制,以颤蚓为主要研究对象,研究了化学氧化与砂滤对蠕虫污染的协同控制作用.结果表明,以化学氧化和砂滤拦截为基础的截留灭活技术对颤蚓具有高效控制效果,当ClO2投量超过0.1mg/L后,9~15m/h的滤速范围内均实现了对颤蚓的100%拦截.截留灭活过程中,化学氧化和砂滤拦截实现了对颤蚓污染的协同控制作用：砂滤可延长化学氧化接触时间,化学氧化则通过降低颤蚓的迁移能力提高了砂滤拦截效果.通过在BAC滤池内增设石英砂垫层对仙女虫进行截留灭活,实现了对仙女虫污染的高效控制,同时避免了对BAC滤池正常吸附和降解功能的影响.

In order to control worm pollution more effectively in drinking water treatment processes,cooperative controlling effects of chemical oxidation and sand filtration on Tubifex tubifex were studied.Interception-inactivated technology,established by combining interception of sand filtration and inactivation of oxidation,posses high controlling effects on T.tubifex pollution.When the dosage of ClO2 was higher than 0.1mg/L,rate of interception-inactivation to T.tubifex reached 100% under the range of filtration rates from 9 to 15m/h.During interception-inactivation,the interception of sand filtration prolonged inactivated contact time,which resulted in the promoting of inactivation effect.At the same time,inactivation of oxidation ould not only kill some worms,but also decrease migration ability of survived worms by which the interception effect of sand filtration was strengthened.Naidid pollution occurred in BAC filter was controlled efficiently by underling sand under BAC and carrying out interception-inactivation in sand.In this way,adverse effects of worm pollution controlling on BAC filter＇s adsorption and degradation were avoided.