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首页> 外文期刊>Environmental Science: Water Research & Technology >Emerging investigator series: formation of brominated haloacetamides from trihalomethanes during zero-valent iron reduction and subsequent booster chlorination in drinking water distribution
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Emerging investigator series: formation of brominated haloacetamides from trihalomethanes during zero-valent iron reduction and subsequent booster chlorination in drinking water distribution

机译：新兴调查仪系列：在零价铁还原过程中，在三卤代甲烷中形成溴化卤代酰胺，随后的饮用水分布中的增强氯化

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摘要

Iron materials and booster chlorination in drinking water distribution pipe networks could impact disinfection by-product (DBP) transformation. This study investigated trihalomethane (THM) mixture degradation and brominated haloacetamide (Br-HAM) formation during zero-valent iron (ZVI) reduction and booster chlorination. The toxicity change resulting from the formation of the higher toxicity species, Br-HAMs, in drinking water distribution systems was explored for the first time. The results from tribromomethane (TBM) reduction experiments showed that the ZVI dosage and the water matrix enhanced TBM reduction by ZVI. The higher the ZVI dosage and the lower the pH, the more TBM was reduced by ZVI. Coexisting ions, SO42- and HCO3-, promoted TBM reduction slightly. The humic acid-like component of natural organic matter was conjectured to dominate the coordination complex generation through reacting with Fe2+ and therefore greatly inhibited TBM reduction. During the subsequent booster chlorination, brominated THM yields increased with time, while a sharp increase in Br-HAMs was observed before it decreased. Under the drinking water distribution system conditions with an environmentally relevant concentration ratio of the THM mixture, most THMs were reduced greatly by ZVI. Subsequently, the following booster chlorination produced Br-THMs and Br-HAMs instead of haloacetonitriles (HANs). Generally, THMs slightly increased with time (except for trichloromethane [TCM]), while Br-HAMs exhibited a sharp formation at 0.5 h after booster chlorination and then decreased gradually. This resulted in an increase in the cytotoxicity and genotoxicity index, indicating that booster chlorination should not be too close to residential areas in iron pipe networks. Overall, the toxicity risk caused by Br-HAM formation through ZVI reduction and booster chlorination increased.
机译：饮用水分配管网中的铁材料和增强氯化可能会影响消毒副产品（DBP）转化。该研究在零价铁（ZVI）减少和增强氯化期间，研究了三卤甲烷（THM）混合物的劣化和溴化卤代酰胺（Br-Ham）形成。第一次探讨了由饮用水分配系统形成较高毒性物种BR-HAMS产生的毒性变化。 Tribromomethane（TBM）还原实验结果表明，ZVI剂量和水基质通过ZVI减少了TBM。 ZVI剂量越高，pH越低，ZVI减少了越多的TBM。共存离子，SO42和HCO3-，稍微促进TBM。通过与Fe2 +反应来调节天然有机物质的腐殖酸状成分以使配位复合产生通过反应来定位通过Fe2 +，因此大大抑制TBM还原。在随后的增强氯化过程中，溴化THM产率随时间而增加，而在降低之前观察到Br-Hams的急剧增加。在饮用水分配系统条件下，具有对细胞环境相关的浓度比的条件，ZVI大部分大部分大部分减少。随后，以下增强氯化产生BR-THM和BR-HAMS而不是卤代乙腈（HAN）。通常，随着时间的推移，THM略有增加（三氯甲烷[TCM]除外），而BR-HAMS在增强后在加油后在0.5小时下表现出剧烈地层，然后逐渐降低。这导致细胞毒性和遗传毒性指数增加，表明增强氯离子不应过于靠近铁管网中的住宅区。总体而言，通过ZVI减少和增强氯化的BR-HAM形成引起的毒性风险增加。

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    Luo Pengzhou; Wang FeiFei; Krasner Stuart W.; Fang Chao; Chen Shenghua; Chu Wenhai;

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    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resources Reuse Room 308 Mingjing Bldg 1239 Siping Rd Shanghai 200092 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China;

    Shanghai Univ Sch Environm & Chem Engn Shanghai 200444 Peoples R China;

    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resources Reuse Room 308 Mingjing Bldg 1239 Siping Rd Shanghai 200092 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China;

    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resources Reuse Room 308 Mingjing Bldg 1239 Siping Rd Shanghai 200092 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China;

    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resources Reuse Room 308 Mingjing Bldg 1239 Siping Rd Shanghai 200092 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China;

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