上海某水厂深度处理改造工程设计

Design of Advanced Treatment Reconstruction Project of a WTP in Shanghai

青草沙水库原水有机物含量较高,常规处理后氯消毒副产物存在超标风险,针对此情况,上海某水厂进行深度处理改造,改造工艺主要采用“预臭氧+强化常规处理+臭氧-生物活性炭深度处理”。结合场地条件,巧妙构思设计方案,化繁为简,采用合建、叠建等集约化布置的形式,合理顺畅衔接水厂的新老系统,在改造过程中维持常规处理的正常生产。改造后出水水质符合上海市《生活饮用水水质标准》(DB31/T1091—2018)的要求,出厂水的COD_(Mn)质量浓度由1.28mg/L降低至0.46mg/L,消毒副产物(三卤甲烷)由0.26降低至0.03,出水COD_(Mn)消毒副产物的浓度低于常规处理,可为类似水厂深度处理改造提供设计案例。

The raw water of Qingcaosha Reservoir has a high content of organic matter,and there is a risk of excessive chlorine disinfection by-products after conventional treatment.In response to this situation,a water treatment plant(WTP)in Shanghai carries out advanced treatment reconstruction.The reconstruction process mainly adopts"pre-ozone+enhanced conventional treatment+advanced ozone bio-activated carbon treatment.Combined with the site conditions,the design scheme is cleverly conceived,and the complex is simplified.The form of intensive layout such as co-construction and stacking is adopted to reasonably and smoothly connect the new and old systems of the WTP,and maintain the normal production of conventional treatment during the renovation process.After the reconstruction,finished water quality can meet Standards for Drinking Water Quality(DB 31/T 1091-2018),The COD_(mn) of the finished water is reduced from 1.28 mg/L to 0.46 mg/L,and the disinfection by-products(trihalomethanes)are reduced from 0.26 to 0.03.The concentration of advanced water treatment is lower than that of conventional treatment,which can provide a design case for advanced treatment and transformation of similar WTP.