DBP formation and toxicity alteration during UV/chlorine treatment of wastewater and the effects of ammonia and bromide
DBP formation and toxicity alteration during UV/chlorine treatment of wastewater and the effects of ammonia and bromide
复制标题
废水紫外线/氯处理过程中 DBP 的形成和毒性变化以及氨和溴化物的影响
DOI：
10.1016/j.watres.2020.116549
复制
发表时间：
2021-01-01
期刊：
影响因子：
12.8
通讯作者：
An, Taicheng
中科院分区：
文献类型：
--
作者：
Hua, Zhechao;Li, Dan;An, Taicheng
紫外线/氯工艺是有效的减少微污染物，然而，消毒副产物（DBPs）的形成和毒性可以在处理过程中改变。本研究调查了废水的UV/氯处理后的出水有机物特性，DBP的形成和毒性变化，特别是，在废水中的典型水基质成分，即氨和溴，进行了研究。原废水含有低水平的氨（3 μ M）和溴化物（0.5 μ M）。UV/氯处理有效地消除了90 - 94%的荧光成分。与单独氯化相比，20 min的UV/Cl处理使三卤代甲烷（THMs）、卤代乙酸（哈斯）、水合氯醛（CH）、卤代乙腈（HANs）、三氯硝基甲烷（TCNM）和卤代乙酰胺（HAcAms）的形成增加了90 - 508%。在UV/氯处理后的后氯化中，CH、HANs、TCNM和HAcAms的形成增加了77 - 274%，而THMs和哈斯的形成均略微增加了11%。同时，计算出的细胞毒性和遗传毒性的消毒副产物后，紫外线/氯处理和后氯化，大大增加，主要是由于增加形成的哈斯和含氮消毒副产物（N-DBPs）。然而，废水的急性毒性费氏弧菌和遗传毒性测定的umu测试下降了19%和76%，分别为20分钟后，紫外线/氯处理。一个额外的200亩M氨减少了所有检测到的消毒副产物的形成过程中的UV/氯处理和24小时后氯化，除了TCNM形成增加了11%，在后氯化。加标200 μ M氨的废水的急性毒性比UV/氯处理后的原废水低32%，但遗传毒性高58%。向紫外线/氯工艺中添加1 mg/L溴显着增加了溴化消毒副产物的形成以及计算出的消毒副产物的总体细胞毒性和遗传毒性。而在UV/Cl处理中加入溴化物后，废水的急性毒性和遗传毒性分别降低了7%和100%。本研究表明，紫外线/氯处理可以有效地降低废水的急性毒性和遗传毒性。(C)2020爱思唯尔有限公司保留所有权利。
The UV/chlorine process is efficient for the abatement of micropollutants; yet, the formation of disinfection by-products (DBPs) and the toxicity can be altered during the treatment. This study investigated effluent organic matter characterization, DBP formation and toxicity alteration after the UV/chlorine treatment of wastewater; particularly, typical water matrix components in wastewater, namely, ammonia and bromide, were studied. The raw wastewater contained low levels of ammonia (3 mu M) and bromide (0.5 mu M). The UV/chlorine treatment efficiently eliminated 90 - 94% of fluorescent components. Compared with chlorination alone, a 20 min UV/chlorine treatment increased the formation of trihalomethanes (THMs), haloacetic acids (HAAs), chloral hydrate (CH), haloacetonitriles (HANs), trichloronitromethane (TCNM) and haloacetamides (HAcAms) by 90 - 508%. In post-chlorination after the UV/chlorine treatment, the formation of CH, HANs, TCNM and HAcAms increased by 77 - 274%, whereas the formation of both THMs and HAAs increased slightly by 11%. Meanwhile, the calculated cytotoxicity and genotoxicity of DBPs increased considerably after the UV/chlorine treatment and in post-chlorination, primarily due to the increased formation of HAAs and nitrogenous DBPs (N-DBPs). However, the acute toxicity of the wastewater to Vibrio fischeri and genotoxicity determined by the umu test decreased by 19% and 76%, respectively, after the 20 min UV/chlorine treatment. An additional 200 mu M ammonia decreased the formation of all detected DBPs during the UV/chlorine treatment and 24 h post-chlorination, except that TCNM formation increased by 11% during post-chlorination. The acute toxicity of wastewater spiked with 200 mu M ammonia was 32% lower than that of raw wastewater after the UV/chlorine treatment, but the genotoxicity was 58% higher. The addition of 1 mg/L bromide to the UV/chlorine process dramatically increased the formation of brominated DBPs and the overall calculated cytotoxicity and genotoxicity of DBPs. However, the acute toxicity and genotoxicity of the wastewater decreased by 7% and 100%, respectively, when bromide was added to the UV/chlorine treatment. This study illuminated that UV/chlorine treatment can decrease acute and geno- toxicities of wastewater efficiently. (C) 2020 Elsevier Ltd. All rights reserved.