首页|中试紫外/氯工艺对饮用水中微量有机污染物及消毒副产物的削减

中试紫外/氯工艺对饮用水中微量有机污染物及消毒副产物的削减

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  • 国家科技期刊平台
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针对水源微污染等问题，在某饮用水厂开展紫外/氯高级氧化工艺深度处理滤后水的中试研究，探究不同工艺条件下水中微量有机污染物(TrOCs，trace organic contaminants)的去除及消毒副产物(DBPs，disinfection by-products)的控制机制。结果表明，紫外/氯工艺可高效去除滤后水中的异丙甲草胺、多菌灵、吡虫啉等农药，上述基础工况下其总体去除率为87。1％。提高紫外剂量对各类农药去除率的提升效果优于增大加氯量。水中全氟化合物(PFCs，perfluorinated compounds)的去除效率一般，其中全氟辛酸(PFOA，Perfluorooctanoic acid)去除率(46。4％)相对最高，而部分工况下全氟己酸(PFHxA，perfluorocaproic acid)等出现浓度升高的情况，说明在紫外/氯高级氧化过程中可能存在长链PFCs向短链PFCs转化的降解途径。紫外/氯高级氧化过程伴随着一定量的三氯甲烷(TCM，trichloromethane)等DBPs的生成(≤ 8。8 μg·L-1)，但工艺出水的消毒副产物生成势(DBPsFP，formation potential of DBPs)下降明显，且加氯量越高消毒副产物的生成势越低，其最低值(12。9 μg·L-1)相较于处理前降幅达到66。3％。对滤后水中常规有机物指标进行分析，发现紫外/氯工艺可以强化去除滤后水中的芳香性和荧光性有机物，工艺出水的比紫外吸光度(SUVA)降至1。0L·(mg·m)-1以下，3类荧光组分的去除率在41。8％～71。6％。相关性分析结果表明，紫外/氯处理过程中DBPs的生成及后续DBPsFP的大小主要取决于水中荧光性/芳香性有机物组分的含量。
Elimination of trace organic contaminants and disinfection by-products in drinking water by a pilot-scale UV/chlorine process
Against the background of water sources being contaminated by micropollutants,a pilot-scale UV/chlorine system was set up in a drinking water treatment plant to explore the efficacy and mechanism of trace organic contaminants removal as well as the elimination of disinfection by-products and the formation potentials under different process conditions.Results show that the UV/chlorine process was efficient in removing metolachlor,carbendazim,imidacloprid and other pesticides found in the sand-filtered water.A gross removal efficiency of 87.1％was achieved under the benchmark operation condition,while an elevated UV fluence was more beneficial than an increased chlorine dose.The removal of perfluorinated compounds(PFCs)by UV/chlorine was relatively low with the largest removal efficiency found with perfluorooctanoic acid(PFOA),which was 46.4％.The content of perfluorohexanoic acid(PFHxA)was found to increase under some operation conditions.This indicates that the transformation of long-chain PFCs to short-chain PFCs could exist during the process.Meanwhile,disinfection by-products(DBPs)consisting mainly of trichloromethane(TCM)were generated with a maximum concentration of 8.8 μg·L-1,yet the disinfection by-products formation potential(DBPsFP)of the effluent decreased significantly.The minimum DBPsFP occurred with the largest chlorine dose,which was 12.9 μg·L-1,66.3％lower than that before UV/chlorine treatment.Moreover,the changes in dissolved organic matter in the sand-filtered water were characterized with parameters such as the UV absorbance at 254 nm(UV254)and fluorescence excitation emission matrix.The aromatic and fluorescent constitutions of the organics were reduced significantly by UV/chlorine treatment as evidenced by the lowered SUVA(＜1.0 L·mg-1·m-1)and the prominent removal efficiencies of the three identified fluorescent compositions(41.8％～71.6％).A correlation analysis was conducted which revealed the strong correlations between the formed DBPs or the subsequent DBPsFP and the contents of aromatic and fluorescent constitutions in the water.

UV/chlorinedrinking waterpesticidesperfluorinated compoundsdisinfection by-productsdisinfection by-products formation potential

刘丽忠、李一繁、尤立、陈榕汶、王亮、王平、董慧峪、李文涛、强志民

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东华理工大学水资源与环境工程学院,南昌 330013

中国科学院生态环境研究中心饮用水科学与技术重点实验室,北京 100085

中国科学院生态环境研究中心环境水质学国家重点实验室,北京 100085

绍兴市上虞区供水有限公司,绍兴 312300

东华理工大学,南昌 330013

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紫外/氯 饮用水 农药 全氟化合物 消毒副产物 消毒副产物生成势

北京市自然科学基金江西省研究生创新基金江西省研究生创新基金江西省自然科学基金东华理工大学博士科研启动金东华理工大学实验技术开发项目江西省教育厅科学技术研究项目

8212037YC2022-s624YC2021-S64920202BABL214039DHBK2018064DHSY-202264GJJ2200770

2024

10.12030/j.cjee.202311001

环境工程学报
中国科学院生态环境研究中心

环境工程学报

CSTPCD北大核心
影响因子：0.804
ISSN：1673-9108
年,卷(期)：2024.18(3)
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