给水厂不同加氯方式对THMs生成量的影响  

Effect of Different Chlorination Methods on THMs Production in Water Supply Plants

作　　者：黄懿华 徐宏梅 许锦 张钰 HUANG Yi-hua;XU Hong-mei;XU Jin;ZHANG Yu(Suzhou Wuzhong Water Supply Co.,Ltd.,Suzhou 215100,China)

机构地区：[1]苏州吴中供水有限公司,江苏苏州215100

出　　处：《中国市政工程》2024年第5期50-55,160,共7页China Municipal Engineering

摘　　要：以苏州某给水厂深度处理出水(未加氯)为实验对象,考察消毒剂投加量、反应时间、反应温度等反应条件对出厂水余氯浓度和消毒副产物三卤甲烷(THMs)生成量的影响。试验目的在于模拟给水厂在清水池前后投加消毒剂,在此基础上探索适宜的消毒剂投加方案,能够在保障余氯的情况下进一步降低出厂水THMs生成量。综合对比结果表明,消毒剂的投加量越大、消毒剂接触时间越长和反应水温越高,THMs生成量越高。在同等加氯量下,投加浓度为10%和5%的次氯酸钠对THMs生成趋势无较大影响,而采用分段投加(清水池前、后加氯消毒)的方式能够达到降低THMs生成量的目的。采用10%次氯酸钠消毒剂时,后加氯量12 mg/L,补加氯量5 mg/L,是试验中THMs生成量最低的消毒剂投加组合。Taking the untreated effluent from a water supply plant in Suzhou as the experimental object,the effects of disinfectant dosage,reaction time,reaction temperature and other reaction conditions on the residual chlorine concentration in the effluent and the production of disinfection byproducts trihalomethanes(THMs)are investigated.The purpose of the experiment is to simulate the addition of disinfectants before and after the clean water tank in a water supply plant,and explore a suitable disinfectant addition plan based on this,which can further reduce the generation of THMs in the factory water while ensuring residual chlorine.The comprehensive comparison results show that the larger the dosage of disinfectant,the longer the contact time of disinfectant,and the higher the reaction water temperature,the higher the amount of THMs generated.At the same chlorine dosage,the addition of sodium hypochlorite with concentrations of 10%and 5%has little effect on the trend of THMs generation,while the use of segmented addition(chlorine disinfection before and after the clean water tank)can achieve the goal of reducing THMs generation.When using 10%sodium hypochlorite disinfectant,the addition of 12 mg/L chlorine and 5 mg/L chlorine are the lowest THMs generation disinfectant combinations in the experiment.

关 键 词：给水厂 分段加氯 THMs(三卤甲烷) 余氯 

分 类 号：TU991.25[建筑科学—市政工程]