用新型絮凝剂聚磷硫酸铁处理城市生活废水

来源期刊：中南大学学报(自然科学版)2002年第2期

论文作者：郑雅杰 龚竹青 张钦发 陈白珍 杨喜云

文章页码：141 - 144

关键词：硫铁矿;烧渣;聚磷硫酸铁;絮凝;废水

Key words：pyrite; cinders; polyphosphoferric sulfate; coagulation; sewage

摘    要：以硫铁矿烧渣为原料制得聚硫酸铁(PFS),然后在PFS溶液中加入Na₃PO₄ 得到聚磷硫酸铁(PPFS),使用PPFS对城市生活废水进行处理,利用正交方法研究PPFS碱化度、PPFS中磷铁的量比、PPFS剂量及废水的pH值等对城市生活废水COD_Cr和浊度去除率的影响.实验结果表明:当PPFS碱化度B为9.33%,其磷、铁的量比n(P)∶n(Fe)=0.05,废水pH值约为7,废水含Fe的质量浓度为55.2 mg/L时,PPFS具有最佳絮凝效果;在废水中加入PPFS后能有效地降低胶体的电位,发生电中和反应;处理后废水COD_Cr质量浓度和浊度分别从140 mg/L和60下降到41.2 mg/L和1.3,COD_Cr降低70.6%,浊度降低97.7%,说明PPFS能有效地除去COD_Cr和降低浊度,除去废水中的污染物.

Abstract: Polyferric sulfate (PFS) was prepared from pyrite cinders and polyphosferric sulfate (PPFS) was made after Na₃PO₄ was added into PFS solution. Municipal sewage was treated by polyphosferric sulfate (PPFS). The factors, which affected the COD_Cr and turbidity removal rates of the sewage, were studied with optimumtest method. The factors were as follows: alkali degree, molar ratio of PtoFe, pH and PPFS dosage. Coagulation effects were the best when alkali degree of PPFS was 9.33%, P to Fe molar ration of PPFS was 0.05, pH of sewage was about 7 and sewage contained 55.2 mg/L Fe of PPFS. Colloidal potential was decreased because electrical neutralization occurred after adding coagulant into the sewage. COD_Cr and turbidity of the sewage decreased from140 mg/L and 60 degree to 41.2 mg/L and 1.3 degree after being treated respectively. COD_Cr and turbidity removal rates were respectively up to 70.6% and 97.7%. The test results show that PPFS can remove COD_Cr and turbidity of the sewage effectively.