鱼油氯胺消毒过程中溴代和碘代含氮消毒副产物的生成  

The formation of brominated and iodinated nitrogenous disinfection by-products during the chloramination of fish oil

作　　者：查晓松 于颖奇 ZHA Xiaosong;YU Yingqi(Key Laboratory of Estuarine Ecological Security and Environmenta Health of Fujian Province,Xiamen University Tan KahKee College,Zhangzhou,363105,China;College of the Environment&Ecology,Xiamen University,Xiamen,361102,China)

机构地区：[1]河口生态安全与环境健康福建省高校重点实验室,厦门大学嘉庚学院,漳州363105 [2]厦门大学环境与生态学院,厦门361102

出　　处：《环境化学》2023年第5期1414-1423,共10页Environmental Chemistry

基　　金：福建省自然科学基金(2020J05017)资助.

摘　　要：本研究采用鱼油作为模拟化合物,模拟微污染原水中广泛存在的生物源有机物的脂肪类组成成分,考察氯胺消毒过程中溴代和碘代含氮消毒副产物(nitrogenous disinfection by-products,N-DBPs)的生成情况.结果表明,鱼油经氯胺消毒后,生成的溴代和碘代N-DBPs主要包括一溴乙腈(bromoacetonitrile,BAN)、二溴乙腈(dibromoacetonitrile,DBAN)、一溴硝基甲烷(bromonitromethane,BNM)、一碘乙腈(iodoacetonitrile,IAN).其中,在本研究考察范围内,BAN、DBAN与BNM的生成量会随溴离子和总有机碳(Total Organic Carbon,TOC)浓度的增加而增加;当溴离子浓度为5 mg·L^(−1),TOC为20 mg·L^(−1)时,BAN、DBAN与BNM的最大生成量分别为71.15、192.36、27.52μg·L^(−1).IAN的生成量则随碘离子和TOC浓度的增加而增加;当碘离子浓度为0.5 mg·L^(−1),TOC为20 mg·L^(−1)时,IAN的最大生成量为106.95μg·L^(−1).当氯胺的投加量从5 mg·L^(−1)增加到100 mg·L^(−1)时,BAN、DBAN、BNM与IAN的生成量分别从4.62、33.75、3.75、10.29μg·L^(−1)增加到49.69、218.40、22.34、123.44μg·L^(−1).4种N-DBPs的生成量均随消毒时间的延长而增加,在消毒72 h后,4种N-DBPs的生成量均达到最大值.3种卤乙腈类N-DBPs(BAN、DBAN与IAN)的生成量均随初始pH的增加呈现出先增加后减少的趋势,而BNM的生成量则随初始pH的增加而不断减少.In this study,fish oil was adopted as the surrogate model compound to simulate the lipid composition of biologically derived organic matter which widely presented in micro-polluted raw water.The formation of brominated and iodinated nitrogenous disinfection by-products(N-DBPs)during the chloramination of fish oil were also investigated.The results showed that four brominated and iodinated N-DBPs including bromoacetonitrile(BAN),dibromoacetonitrile(DBAN),bromonitromethane(BNM)and iodoacetonitrile(IAN)were generated from the chloramination of fish oil.The concentration of BAN,DBAN,and BNM were gradually increased with the increasing bromide ion concentration from 0 to 5 mg·L^(−1).Specifically,the maximum formation yield of BAN,DBAN and BNM was 71.15μg·L^(−1),192.36μg·L^(−1)and 27.52μg·L^(−1),respectively,with the bromide ion concentration of 5 mg·L^(−1)and the total organic carbon(TOC)concentration of 20 mg·L^(−1).Similarly,the concentration of IAN was gradually increased with the increasing iodide ion concentration from 0 to 0.5 mg·L^(−1).The maximum yield of IAN was 106.95μg·L^(−1)with the iodide ion concentration of 0.5μg·L^(−1)and the TOC concentration of 20 mg·L^(−1).In addition,the concentrations of BAN,DBAN,BNM and IAN were increased from 4.62,33.75,3.75,10.28μg·L^(−1)to 49.69,218.40,22.34,123.44μg·L^(−1)when the chloramine dose increased from 5 mg·L^(−1)to 100 mg·L^(−1).The yields of four N-DBPs were highly positively correlated with the disinfection time which reached the maximum yield after 72 h disinfection.The formation of BAN,DBAN and IAN were firstly increased and then decreased with the increase of inital pH,while the formation of BNM was decreased constantly with the increase of inital pH.

关 键 词：含氮消毒副产物 氯胺消毒 溴离子 碘离子 鱼油 

分 类 号：TU991.2[建筑科学—市政工程]