净水厂颗粒活性炭吸附池反冲洗水特征研究  

Study on characteristics of backwash water from granular activated carbon adsorption tank in water purification plant

作　　者：蒋浩男 李大鹏[1] 张雪[2] 单苏洁 刘松琪 JIANG Haonan;LI Dapeng;ZHANG Xue;SHAN Sujie;LIU Songqi(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Suzhou Water Supply Co.,Ltd.,Suzhou 215002,China)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009 [2]苏州市自来水有限公司,苏州215002

出　　处：《给水排水》2023年第7期8-13,共6页Water & Wastewater Engineering

基　　金：苏州市水利水务科技项目(2022003)。

摘　　要：以苏州市某净水厂(水源地为太湖)为研究对象,对GAC吸附池反冲洗水中的有机物、消毒副产物和微生物等指标进行检测,并在此基础上分析了该反冲洗水潜藏的回用风险。检测发现冬季反冲洗水质优于夏季,GAC吸附池反冲洗过程中pH和氨氮浓度与原水持平;浊度下降迅速,可以保证在水冲洗8 min时降至10NTU以下;各冲洗阶段的高锰酸盐含量低于原水。此外对有机物、消毒副产物和微生物属性进行分析,发现反冲洗水中有机物以小分子为主,疏水性有机物占比超70%,交互试验中发现小分子有机物与疏水性有机物为消毒副产物产生的主要前驱物;微生物属性研究显示,反冲洗水中2~5μm颗粒占比超50%,游离细菌数量占主体,附着类细菌与颗粒物数量相关性较高。In this paper,a water purification plant in Suzhou(the water source is Taihu Lake)was used as the research target,and sampling and analysis methods were developed to test the organic matter,disinfection by-products and microorganisms in the backwash water of the GAC adsorption tank,and on this basis,the potential reuse risk of this backwash water was analyzed.It was found that the backwash water quality was better in winter than in summer,and the pH value and ammonia nitrogen concentration in the GAC adsorption tank backwash process were the same as the original water.Turbidity decreased rapidly and could be guaranteed to drop below 10 NTU in 8 minutes of water flushing;the permanganate content in each flushing stage was lower than that of the original water.In addition,the analysis of organic matter,disinfection by-products and microbial properties showed that the organic matter in the backwash water was mainly small molecules,with hydrophobic organic matter accounting for more than 70%of the total.The correlation between the number of attached bacteria and the number of particles was high.

关 键 词：反冲洗水 颗粒活性炭吸附池 消毒副产物 

分 类 号：TU991[建筑科学—市政工程]