水处理各工艺单元对有机物及消毒副产物前体物的去除效果

摘要

The removal efficiency of organics and disinfection byproduct precursors (DBPs) in raw water of north Taihu Lake was studied by setting up a pilot facility with processes of “ozone pretreatment + conventional process + ozone biological activated carbon treatment (ozone-BAC)”.The results showed that the whole process could reduce all kinds of organics effectively,and the removal efficiency of CODMn,DOC,UV254 and trihalomethanes formation potential (THMFP) were 63.8％,42.1％,72.3％ and 33.4％,respectively.The concentration of CODMn and THMFP in the effluent was 1.39 mg/L and 316.1 μg/L,respectively.The removal of organics and trihalomethanes (THMs) precursors was most obvious in the coagulation and sedimentation stage,in which the removal effect of UV254 was the most obvious,and its romoval rate reached 59.1％.UV254 could be used to characterize the amount of THMFP in water indirectly.The residual chlorine in water can react with organics continuously to produce DBPs,thus the initial value of trihalomethanes (THM0) has a great correlation with the residual chlorine content in water.The concentration of THMFP increases by 13.0％ in the ozone-BAC treatment stage.%通过搭建具有新型工艺“臭氧预处理+常规工艺+臭氧生物活性炭处理(臭氧-BAC)”的中试装置,考察了其对北太湖原水中有机物和消毒副产物前体物的去除效果.结果表明:整套工艺能够有效降低各类有机物浓度,对CODMn、DOC、UV254和三卤甲烷生成潜能(THMFP)的去除率分别达到63.8％、42.1％、72.3％以及33.4％,其中CODMn的出水浓度为1.39 mg/L,出水中THMFP的浓度为316.1 μg/L;对有机物和三卤甲烷(THMs)前体物去除效果最显著的是混凝沉淀阶段,其中对UV254的去除效果最明显,去除率达到59.1％,UV254能够间接表征水体中的THMFP含量;水中的余氯能够持续与有机物反应生成消毒副产物,因此三卤甲烷初始值(THM0)与水中余氯含量的变化具有较大的相关性;臭氧-BAC阶段THMFP浓度升高了13.0％.