Microcystin-associated disinfection by-products: The real and non-negligible risk to drinking water subject to chlorination
Microcystin-associated disinfection by-products: The real and non-negligible risk to drinking water subject to chlorination
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DOI：
10.1016/j.cej.2015.05.048
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发表时间：
2015-11-01
影响因子：
15.1
通讯作者：
Pei, Ruoting
中科院分区：
文献类型：
--
作者：
Zong, Wansong;Sun, Feng;Pei, Ruoting
微囊藻毒素（MC）污染水的氯化是一个令人关注的问题，因为在处理后的水中可能会形成不希望的MC相关消毒副产物（MC-DBPs）。为控制氯化饮用水中MCs和MC-DBPs的风险，对受MCs污染的饮用水进行了氯化处理、水样的残留毒性和MC-DBPs的潜在风险评价。在氯化作用下，MCRR（MC 2和4位的两个可变氨基酸为L和R）和MCRR（MC 2和4位的两个可变氨基酸均为R）迅速转化为各种MC-DBP，水样对蛋白磷酸酶1（PP 1）的毒性随氯化作用时间的延长而逐渐降低。虽然MC-DBPs的生物毒性低于原始MclO和MCRR，但即使MclO和MCRR完全降解，其对饮用水的真实的和不可忽视的风险也值得进一步关注。与MCs浓度相比，MCs和MC-DBPs的综合毒性是更适合MCs污染水体的控制指标。由于水样的毒性与CT值（氯残留浓度的累积值乘以接触时间）密切相关，因此在氯浓度受限的情况下，通过提供足够的接触时间可以有效控制MCs和MC-DBPs的风险。本研究对MCs和MC-DBPs的危害性进行了全面评价，为控制其对饮用水的潜在风险提供了有效的技术支持。(C)2015 Elsevier B. V.版权所有。
Chlorination of microcystin (MC) contaminated water is of concern due to the potential formation of undesired MC-associated disinfection by-products (MC-DBPs) in the treated water. To control the risk of MCs and MC-DBPs in chlorinated drinking water, the chlorination of MC contaminated water, the residual toxicity of water samples, and the potential risk of primary MC-DBPs were evaluated. Subject to chlorination, MCLR (the two variable amino acids at position 2 and 4 of MC are Leucine-L and Argnine-R) and MCRR (the two variable amino acids at position 2 and 4 of MC both are Argnine-R) were quickly transformed into various MC-DBPs and the toxicity of water samples on protein phosphatase 1 (PP1) gradually decreased with chlorination contact time. Though MC-DBPs had lower biological toxicity than the original MCLR and MCRR, their real and non-negligible risk to drinking water also deserved further attention even though MCLR and MCRR were completely degraded. Comparing to MCLR concentration, the integrated toxicity of water samples (MCs and MC-DBPs) was a more suitable control index for MCs contaminated water. As the toxicity of water samples was closely related to CT values (the cumulative value of residual concentration of chlorine multiplied by contact time), the risk of MCs and MC-DBPs could be effectively controlled by providing adequate contact time when chlorine concentration was restricted. This study offers a comprehensive evaluation of the hazard of MCs and MC-DBPs, and provides a valid technique support for the control of their potential risk to drinking water. (C) 2015 Elsevier B.V. All rights reserved.