Effect of bromide and iodide on halogenated by-product formation from different organic precursors during UV/chlorine processes
Effect of bromide and iodide on halogenated by-product formation from different organic precursors during UV/chlorine processes
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溴化物和碘化物对紫外线/氯过程中不同有机前体形成卤化副产物的影响
DOI：
10.1016/j.watres.2020.116035
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发表时间：
2020-09-01
期刊：
影响因子：
12.8
通讯作者：
Gao, Nai-Yun
中科院分区：
文献类型：
--
作者：
Gao, Ze-Chen;Lin, Yi-Li;Gao, Nai-Yun
研究了溴化物和碘化物对紫外/氯化过程中腐植酸（HA）和藻类有机物（AOM）转化以及消毒副产物（DBPs）形成的影响。实验结果表明，卤化物有效地抑制了矿化，由于活性卤素和游离卤素的形成和形态不同，有机分子转化发生了多重变化。因此，溴化物和碘化物在DBP的形成中也发挥了重要作用。在UV/氯化过程中，含ha的水中DBP的产率按碘化物负载>淡水>>溴化物负载的顺序下降，而在高UV通量下，含aom的水中DBP的形成随着添加卤化物（淡水>溴化物负载>>碘化物负载）而显著减少。Pearson相关分析显示，含aom水的dbp与水参数相关性较弱，而含ha水的dbp与水参数相关性较好。对于这两种模拟水，计算了理论毒性，含溴化物水的毒性达到峰值，而含碘化物水的计算毒性与淡水相当或略高。因此，紫外线/氯处理可以在淡水或含碘水（仅含碘）中获得质量良好的水，同时降低dbp相关的毒性，但在净化含溴源水（仅含溴）时，需要仔细考虑，特别是对AOM/含溴水。(C) 2020 Elsevier Ltd.版权所有。
The effect of bromide and iodide on the transformation of humic acid (HA) and algal organic matter (AOM), and the formation of disinfection by-products (DBPs) during UV/chlorination were investigated. Experimental results indicated that the halides effectively inhibited mineralization, with multiple changes in organic molecule transformation due to differences in formation and speciation of reactive halogen species and free halogen. As a consequence, bromide and iodide also played important roles in DBP formation. The DBP yields in HA-containing water during UV/chlorination decreased in the order of iodide loaded > freshwater >> bromide loaded, whereas DBP formation in AOM-containing water decreased remarkably with halides added (freshwater > bromide loaded >> iodide loaded) at high UV fluence. Moreover, Pearson correlation analysis exhibited weaker correlation between DBPs and water parameters in AOM-containing water, while DBPs in HA-containing water exhibited better correlation with water parameters. For both simulated waters, the theoretical toxicity was calculated and peaked in bromide-containing water, whereas the calculated toxicity in iodide-containing water was comparable or slightly higher than that in freshwater. Therefore, UV/chlorine treatment may achieve good quality water with reduced DBP-associated toxicity in freshwater or iodide-containing water (iodide only), but careful consideration is needed when purifying source waters containing bromide (bromide only), especially for AOM/bromide-containing water. (C) 2020 Elsevier Ltd. All rights reserved.