重金属絮凝剂PEX对水中铅的去除性能研究  

Removal of Pb(Ⅱ) in Wastewater with Heavy Metal Flocculants PEX

作　　者：韩晓婷[1] 常青[1] 王刚[1] 张明月[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《环境科学与技术》2013年第1期44-47,共4页Environmental Science & Technology

基　　金：国家自然科学基金资助项目(20377020);金川公司预研基金(420032)

摘　　要：在合成高分子重金属絮凝剂聚乙烯亚胺基黄原酸钠(PEX)的基础上,研究了该絮凝剂处理含铅离子废水的效能,并对一些影响因素进行了考查。研究结果表明:高分子重金属絮凝剂PEX对铅离子的捕集效率较高,去除率可达90%以上;pH值对PEX去除铅离子有一定的影响,pH=5.0时去除效果最好;Mg2+﹑Ca2+、EDTA、柠檬酸、焦磷酸钠以及致浊物质的存在均能促进铅离子的去除;絮体残渣稳定性好,金属离子易回收,回收率可达到70.0%。Flocculation performance of polyethyleneimine sodium xanthogente（PEX） was evaluated by using wastewater containing Pb2 ＋.Some factors which affected removal of Pb2 ＋ were also studied.Experimental results showed that PEX has strong binding capabilities with Pb2＋,with removal rate of Pb2＋ above 90%.pH value has effect on the removal rate of Pb2＋,and when pH value equals 5.0,the best removal rate can be obtained.Mg2＋,Ca2＋,EDTA,citric acid,sodium pyrophosphate and turbidity can promote the removal rate of Pb2＋ to different extents respectively.Stability of flocculate chelates is prominent,therefore the leaching-out is very low.It is easy to recover Pb2＋ from the flocs,and recovery rate reached 70.0% after soaking the sludge in nitric acid.

关 键 词：高分子重金属絮凝剂 铅离子 絮凝 螯合沉淀 

分 类 号：X703.1[环境科学与工程—环境工程]