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 of arsenic from wastewater by using cerium as flocculant was studied. The results show that rare earth element cerium precipitates arsenic in the flocculation adsorption solution, the optimal removal of arsenic is about 10, the precipitation time is 2h, and the precipitation effect is better. As (¢ ó) was more than 96% and As (¢ ö) was more than 99% when the Ce / As ¡Ý10 and arsenic initial concentration was 100 mg / L, Flocculant FeCl3, FeSO4, Al2 (SO4) 3 and so much less, 100mg / L arsenic after secondary precipitation of cerium treatment, the emission concentration of arsenic lower than 0  5mg / L of the emission standards, so in production Certain application value.