复合絮凝-螯合法处理镀铬废水  

Treatment of chrome plating wastewater by combination of flocculation and chelation

作　　者：刘存海[1] 韩利萍 

机构地区：[1]教育部轻化工助剂化学与技术重点实验室、陕西科技大学化学与化工学院,陕西西安710021

出　　处：《电镀与涂饰》2013年第2期45-48,共4页Electroplating & Finishing

摘　　要：以二乙烯三胺、CS2、环氧氯丙烷和NaOH为原料,合成一种重金属离子螯合剂(HMCA),采用红外光谱仪对其结构进行了表征,并采用扫描电镜分析了螯合产物的形貌。采用复合絮凝和螯合法联合处理经还原的镀铬废水。当m(PAC)∶m(PFS)∶m(CPAM)=10∶12∶1、pH=7.5时,复合絮凝处理的效果最佳,所得上清液中Cr(Ⅲ)的质量浓度降至143.26mg/L。螯合处理的最佳工艺为:pH=8.5,HMCA加入量为3.87g/L。此时废水中残余Cr(Ⅲ)的质量浓度为0.13mg/L。A heavy metal ion chelating agent （HMCA） was synthesized using diethylenetriamine, carbon disulfide, epichlorohydrin and sodium hydroxide as raw materials. The structure of HMCA was characterized by infrared spectrometer, and the morphology of chelation product was analyzied by using scanning electron microscope. The reduced chrome plating wastewater was treated by the combination of flocculation and chelation. The flocculation effect is best when the mass ratio of PAC, PFS and CPAM is 10：12：1 at pH 8.5. The mass concentration of Cr（Ⅲ） in supernatant is reduced to 143.26 mg/L. The optimal process parameters of chelation are as follows： HMCA 3.87 g/L and pH 8.5. Under the given conditions, the mass concentration of residual Cr（Ⅲ） in effluent is 0.13 mg/L.

关 键 词：镀铬 废水处理 三价铬 絮凝 螯合 

分 类 号：X781.1[环境科学与工程—环境工程] TQ153.11[化学工程—电化学工业]