联合预氧化处理铁锰污染原水的研究及应用  

Research and Application of Combined Preoxidation Treatment of Iron and Manganese Polluted Raw Water

作　　者：纪银传 康得军[2,3] 林业 陈剑评 张芳[2] Ji Yinchuan;Kang Dejun;Lin Ye;Chen Jianping;Zhang Fang(Fujian Province Jinjiang Water Co.,Ltd.,Jinjiang 362200,China;College of Advanced Manufacturing,Fuzhou University,Jinjiang 362251,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福建省晋江自来水股份有限公司,福建晋江362200 [2]福州大学先进制造学院,福建晋江362251 [3]福州大学土木工程学院,福建福州350108

出　　处：《市政技术》2022年第11期154-160,共7页Journal of Municipal Technology

基　　金：福建省教育厅科技项目(JA15094);2022年福建省团队科技特派项目-突发性水源水质污染应急处理及安全保障(484)。

摘　　要：晋江市梅岭水厂设计供水规模为45万t/d,其中二氧化氯采用负压式复合型二氧化氯发生器制备。当原水出现铁、锰超标时,若单独采用二氧化氯作为消毒剂和预氧化剂来处理铁锰污染原水,随着二氧化氯投加量的增加,消毒副产物亚氯酸盐和氯酸盐超标风险随之增大。针对该问题,笔者采用二氧化氯-次氯酸钠联合预氧化消毒法进行试验研究,二氧化氯投加点位模拟采用絮凝前和滤前投加,次氯酸钠投加点位模拟采用滤后投加。试验结果表明:当原水受铁锰中度污染时(原水铁含量<1.66 mg/L、锰含量<0.68 mg/L),可有效去除铁、锰污染物,保证滤后水铁≤0.01 mg/L、锰≤0.01 mg/L、氯酸盐≤0.63 mg/L、亚氯酸盐≤0.66 mg/L、余二氧化氯≥0.55 mg/L。试验和实践表明,二氧化氯-次氯酸钠联合预氧化消毒法可有效解决梅岭水厂原水受铁锰中度污染的问题,但当原水受铁锰重度污染时(原水铁含量≥1.66 mg/L、锰含量≥0.68 mg/L),采用该方法会导致消毒副产物氯酸盐和亚氯酸盐均超标,故不建议采用二氧化氯-次氯酸钠联合预氧化消毒法解决原水铁锰重度污染的问题。The daily water production capacity of Jinjiang Meiling Water Plant is 450000 tons,whose chlorine dioxide(ClO)is prepared by a negative pressure compound ClOgenerator.When iron and manganese exceed the standard of raw water,if iron and manganese polluted raw water is treated by a disinfectant and preoxidant of ClOalone,increasing the dosage will easily cause the problem that the disinfection by-products of chlorite and chlorate(MClO)exceed the standard.The disinfection combination preoxidation method by ClOand sodium hypochlorite(NaClO)is applied to solve the problem.ClOdosing point simulation adopts pre-flocculation and pre-filtration dosing,and NaClO adopts post-filtration dosing.The results show that when raw water is moderate polluted by ferrum(Fe)and managanese(Mn)(the content of Fe is less than 1.66 mg/L and Mn is less than 0.68 mg/L),the Fe and Mn can be effectively removed to ensure that Fe≤0.01 mg/L,Mn≤0.01 mg/L,chlorate≤0.63 mg/L,chlorite≤0.66 mg/L,residual ClO≥0.55 mg/L.Research and practice show that disinfection combination preoxidation method by ClOand sodium hypochlorite(NaClO)method can effectively solve the moderate pollution by Fe&Mn in the raw water of Meiling Water Plant.However,when the raw water is severely polluted(Fe≥1.66 mg/L and Mn≥0.68 mg/L),both he disinfection by-products chlorate and chlorite will exceed the standard and it is not recommended.

关 键 词：自来水处理 二氧化氯 次氯酸钠 联合预氧化消毒法 铁、锰指标 消毒副产物 

分 类 号：X703.1[环境科学与工程—环境工程]