化学沉淀法去除水中镉的特性研究  

Features of removal cadmium by chemical precipitation method

作　　者：谭浩强[1] 吴维[2,3] 刘志滨[2] 何文杰[2] 韩宏大[2] 马越[2] 

机构地区：[1]天津城市建设学院环境与市政工程系,天津300384 [2]天津市自来水集团有限公司,天津300040 [3]天津大学环境科学与工程学院,天津300072

出　　处：《供水技术》2010年第4期9-11,共3页Water Technology

摘　　要：考察了氢氧化物沉淀法和硫化物沉淀法对镉的去除效果。结果表明,两种方法均能将0.025mg/L的镉降低到《生活饮用水卫生标准》限值(0.005mg/L)以内,除镉效果稳定。氢氧化物沉淀法中,三氯化铁作为混凝剂对镉的去除效果明显优于聚合氯化铝,能有效去除0.250mg/L的镉,且处理后铁残余浓度未超标;硫化钠沉淀法除镉效果好,但硫化钠投加量增加到0.20mg/L时,上清液硫化物会超标。The removal of cadmium by hydroxide and sulfide precipitation methods was investigated. The results showed that both methods could reduce 0. 025 mg/L cadmium to lower than the limit value of the Standards for Drinking Water Quality （0. 005 mg/L）, and the efficiency was very stable. The removal by FeC13 was superior to polyaluminum chloride in the process of hydroxide precipitation, 0.250 mg/L cadmium could be removed effectively, and residual Fe was fit the standard. The removal of cadmium by sodium sulfide precipitation method was rather good, but sulfide in the supernatant would be over the standard when the dosage of sodium sulfide increased to 0.20 mg/L.

关 键 词：化学沉淀法 镉 三氯化铁 聚合氯化铝 硫化钠 

分 类 号：TU991[建筑科学—市政工程]