藻有机物在含溴离子条件下氯化消毒HAAs的生成种类研究.docVIP

 藻有机物在含溴离子条件下氯化消毒 HAAs 的生成种类研究 魏源源，刘燕，刘翔，代瑞华 （复旦大学环境科学与工程系，上海 200433） 摘要：藻类污染和溴离子存在是影响沿海地区水库水源消毒副产物形成的重要因素，本研究 在有/无溴离子存在条件下，以藻细胞模拟生化成分（BSA、鱼油和淀粉）、铜绿微囊藻细胞 及其胞外有机物为前躯物进行氯化消毒对比实验，从藻细胞生化成分的角度探究藻有机物作 为消毒副产物前躯物时，且水中存在溴离子的条件下，氯化消毒形成卤乙酸（HAAs）的种 类情况。结果表明，三种模拟生化成分在溴离子存在条件下，形成的溴代 HAAs 仅为溴氯乙 酸或二溴乙酸的一种或两种。与 BSA 和淀粉为前躯物时形成溴代 HAAs 的产物种类相比， 溴离子对鱼油为前躯物时形成溴代 HAAs 产物种类的影响更大。模拟生化成分预测的 HAAs 副产物种类与具体藻种形成的 HAAs 副产物种类之间具有较好的吻合度。 关键词：环境科学；模拟生化成分；铜绿微囊藻；溴离子；氯化消毒；HAAs Haloacetic acids species from the chlorination of algal organic matter in the presence of bromide Wei Yuanyuan, Liu Yan, Liu Xiang, Dai Ruihua (Department of Environmental Science and Engineering, Fudan University, Shanghai 200433) Abstract: Bromide and algal pollution are important factors influencing disinfection byproducts (DBPs) formation and speciation in reservoir water in coastal areas. In this study, the chlorination of model algal cellular compounds (bovine serum albumin, fish oil and starch), Microcystis aeruginosa and its extra-cellular organic matters (EOMs) were conducted in the absence and presence of bromide. The main aim of the present study is to explore their potential as precursors for haloacetic acids (HAAs) speciation upon chlorination in the presence of bromide. The results showed that bromochloroacetic acid (BCAA) or/and dibromoacetic acid (DBAA) was/were produced as for brominated HAAs (Br-HAAs) from the three model compounds in the presence of bromide. The effect of bromide on Br-HAAs speciation upon fish oil chlorination was more evident than with BSA and starch. There was a good correlation between the species predicted from the model compounds and those obtained from specific algal species. Keywords: Environmental science; model biochemical composition; Microcystis aeruginosa; bromide; chlorination; HAAs. 0 引 言 河流入海口通常有许多大城市，为了消除海水潮汐的影响，不得不在河口岸边修建大型 水库作为饮用水源，这类以湖泊、水库为水源的沿海地区常常会遭遇藻类高发和咸潮影响而 引起的问题。一方面，高浓度藻类会导致有机物浓度增加，降低混凝效果[1]；同时，藻细胞 还可以穿透过滤装置，对后续水处理单元产生影响[2,3]。自 1980 年 Hoehn[4]研究四种藻的藻 细胞及其胞外分泌物（EOMs