两级中和-铁盐沉淀法处理高砷废水  

Treatment of high arsenic content wastewater by two-step neutralization-iron salt precipitation

作　　者：彭映林[1] 肖斌[1] 

机构地区：[1]湖南城市学院化学与环境工程学院,湖南益阳413000

出　　处：《工业水处理》2016年第6期64-68,共5页Industrial Water Treatment

基　　金：湖南省教育厅项目(15C0245);益阳市科技计划项目(2014JZ27)

摘　　要：采用两级氢氧化钠中和-硫酸亚铁沉淀法处理高浓度含砷废水,考察了废水pH、n(Fe)∶n(As)、曝气流量、曝气时间、搅拌速度等因素对As(Ⅲ)氧化率和总砷(AsT)去除率的影响。结果表明,在适宜的条件下,经一级处理后,废水中As(Ⅲ)的氧化率和AsT去除率分别为93.98%和78.60%;经二级处理后,废水中AsT去除率为99.99%,AsT残留质量浓度为0.10 mg/L,低于《污水综合排放标准》(GB 8978—1996)的要求。The two-step sodium hydroxide neutralization-ferrous sulfate precipitation process has been used for treating high arsenic content wastewater. The influences of factors,such as pH,n（Fe）∶n（As）,aeration flow,aeration time,stirring speed,etc.,on the oxidation rate of As（Ⅲ） and the removing rate of AsTare investigated. The results show that under optimum conditions,after the primary treatment,the oxidation rate of As（ Ⅲ） is 93.98% and the removing rate of AsT78.60%. After the secondary treatment,the removing rate of AsTis 99.99%,and the residual mass concentration of AsT0.10 mg/L in wastewater,which is lower than the requirements specified in ＂Integrated Wastewater Discharge Standard＂（GB 8978—1996）.

关 键 词：高砷废水 沉淀 氧化 硫酸亚铁 

分 类 号：X703.1[环境科学与工程—环境工程]