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探讨了低压UV/氯共同消毒含聚二烯丙基二甲基氯化铵饮用水,对三氯硝基甲烷(TCNM)形成的影响.在低压汞灯照射条件下(λ=254 nm),考察了光照强度、自由氯浓度、·OH和p H以及聚二烯丙基二甲基氯化铵、二甲胺(DMA)和甲胺(MA)对TCNM形成和降解的影响,并研究了TCNM直接光降解,分析了其降解原因.实验结果表明:TCNM生成量随光照强度、自由氯浓度的增加而增加,随pH增加而降低;胺类物质分子结构越简单,越易生成TCNM;TCNM能直接光降解,但·OH在反应过程中不起主导作用.在这些实验条件下,UV/氯共同消毒可以改变含聚二烯丙基二甲基氯化铵水中的TCNM形成趋势,实验开始时间TCNM生成量显著增加,在5 min时其增幅超过了300%,然后TCNM的生成量显著减少,并且在30 min后几乎消失.该实验结论有助于形成新的TCNM控制策略,以减少TCNM在饮用水和污水处理过程中的产生.
The effect of low pressure UV / chlorine co-disinfection of polydiallyldimethylammonium chloride drinking water on the formation of trichloronitromethane (TCNM) was studied. Under low pressure mercury lamp irradiation (λ = 254 nm) The effects of light intensity, free chlorine concentration, · OH and p H, polydiallyldimethylammonium chloride, dimethylamine (DMA) and methylamine (MA) on the formation and degradation of TCNM were investigated. TCNM was studied by direct photodegradation.The results showed that the amount of TCNM increased with the increase of light intensity and free chlorine concentration and decreased with the increase of pH.The simpler the molecular structure of amines was, Can directly photodegradation, but · OH in the reaction process can not play a leading role in these experimental conditions, UV / chlorine co-disinfection can change the polydiallyl dimethyl ammonium chloride water containing TCNM formation trend, the experiment began TCNM production increased significantly at 5 min, and then increased by more than 300% at 5 min, then TCNM production was significantly reduced and almost disappeared after 30 min.The experimental results contributed to the formation of a new TCNM control strategy to reduce TCNM Production in drinking water and sewerage processes.