稀土的应用研究——铈在含砷废水处理研究中的应用  

Study on Removal of Arsenic in Wastewater by Rare-earth Element

作　　者：谢晓梅[1] 廖敏[1] 石伟勇[1] 王锐[2] 

机构地区：[1]浙江农业大学环境与资源学院土化系 [2]杭州市环境科学研究所

出　　处：《广东微量元素科学》1999年第6期7-11,共5页Trace Elements Science

基　　金：国家自然科学基金

摘　　要：研究了稀土元素铈作为絮凝剂对废水中砷的去除效果。研究发现，稀土元素铈能沉淀絮凝吸附溶液中的砷，最佳除砷ｐＨ为１０左右，沉淀时间为２ｈ，沉淀效果较好。当Ｃｅ／Ａｓ≥１０、砷初始浓度为１００ｍｇ／Ｌ时，Ａｓ（Ⅲ）的去除率大于９６％，Ａｓ（Ⅴ）为９９％以上，所生成的污泥量从体积和重量上均比常用絮凝剂ＦｅＣｌ３、ＦｅＳＯ４、Ａｌ２（ＳＯ４）３等要少得多，１００ｍｇ／Ｌ砷经过铈的二级沉淀处理后，砷的排出浓度低于０５ｍｇ／Ｌ的排放标准，因此在生产上有一定应用价值。The removal ability of rare-earth element Ce in wastewater was studied.The results showed that Ce could remove arsenic from solution in terms of co-precipitation.The optimum pH value was about 10 0,and the settling time could be 2 h.When Ce/As ratio≥10 at the initial arsenic concentration of 100 mg/L,the removal efficiency of As(Ⅲ) and As(Ⅴ) were higher than 96% and 99% respectively.The produced sediment was less than other polymers such as FeCl 3,FeSO 4 and Al 2(SO 4) 3 in volume and weight.Arsenic conecntration was less than 0 5 mg/L after the secondary treatment of 100 mg/L arsenic solution with Ce.

关 键 词：铈 稀土 废水处理 含砷废水 

分 类 号：O614.33[理学—无机化学] X703[理学—化学]