原水砷超标风险下水厂应急处理工艺优化及除砷机制  

Mechanism of Arsenic Removal and Optimization of Emergency Treatments for Drinking Water under Potential Risk of Arsenic

作　　者：杨方旭 方志科 朱西婷 周栋宇 敖键 伍洋涛 卜令君 周石庆[1] YANG Fang-xu;FANG Zhi-ke;ZHU Xi-ting;ZHOU Dong-yu;AO Jian;WU Yang-tao;BU Ling-jun;ZHOU Shi-qing(Hunan Engineering Research Center of Water Security Technology and Application,College of Civil Engineering,Hunan University,Changsha 410082,China;Changsha Water Supply Company,Changsha 410035,China)

机构地区：[1]湖南大学土木工程学院水安全保障技术及应用湖南省工程研究中心,湖南长沙410082 [2]长沙供水有限公司,湖南长沙410035

出　　处：《中国给水排水》2025年第3期28-34,共7页China Water & Wastewater

基　　金：国家重点研发计划项目(2023YFC3207904)。

摘　　要：水厂作为城市供水系统的核心,需采取有效应急措施应对砷污染风险。采用铝盐沉淀法(PAC)、铁盐沉淀法(PFS)和新生态铁工艺进行除砷试验,探讨对不同浓度As(Ⅴ)和As(Ⅲ)的去除效果,并优化混凝剂投量。通过小试和生产性试验,验证铁盐沉淀工艺对砷的高效去除能力,并通过SEM、XPS表征手段探究了PFS、新生态铁的除砷机理。结果表明,铁盐混凝剂对As(Ⅴ)的去除效果优异,新生态铁工艺的除砷效果与PFS相当,预氧化+PFS工艺与新生态铁工艺对As(Ⅲ)具有良好的去除效果。在C市5座水厂进行的生产性试验中,预氧化+PFS工艺成功应对了26.8μg/L的原水砷污染,出厂水砷浓度稳定在4μg/L以内,为水厂砷污染应急处置提供了宝贵经验。As the core of urban water supply system,water plants need to take effective emergency measures to deal with the risk of arsenic pollution.In this study,coprecipitation of arsenic with polyaluminum chloride(PAC),polyferric sulfate(PFS)and in-situ formed Fe coagulant were studied.The removal effects of different concentrations of As(Ⅴ)and As(Ⅲ)were measured,and the dosage of coagulant was optimized.The high-efficiency removal ability of arsenic by iron coprecipitation was verified by jar test and full-scale test,and the arsenic removal mechanism of PFS and in-situ formed Fe was analyzed and verified by SEM and XPS methods.The results showed that the iron coagulant had excellent removal efficiency on As(Ⅴ),in-situ formed Fe process had the same effect as PFS,and the pre-oxidation+PFS process and in-situ formed Fe process had great removal effect on As(Ⅲ).In the full-scale test of five water plants in C city,the pre-oxidation+PFS process successfully coped with the arsenic pollution of up to 26.8μg/L,and the arsenic concentration in the treated water was stable within 4μg/L,which provides valuable experience for the emergency treatment of arsenic pollution in water plants.

关 键 词：除砷 混凝 预氧化 新生态铁 生产性试验 

分 类 号：TU991[建筑科学—市政工程]