氧化-螯合沉淀法处理碱性锌镍合金电镀废水  

Oxidation–chelation precipitation method for treatment of alkaline zinc–nickel alloy electroplating wastewater

作　　者：郭崇武[1] 赖奂汶[1] 陈康[1] GUO Chong-wu;LAI Huan-wen;CHEN Kang(Guangzhou Ultra Union Chemicals Ltd., Guangzhou 510460, China)

机构地区：[1]广州超邦化工有限公司,广东广州510460

出　　处：《电镀与涂饰》2018年第3期137-141,共5页Electroplating & Finishing

摘　　要：在pH=8~13的条件下,用双氧水破坏碱性锌镍合金电镀废水中的羟基羧酸类配位剂。接着调节废水的pH至4.5~5.5,令脂肪族多胺类配位剂的配位能力降低。然后加焦亚硫酸钠还原废水中残留的双氧水,再以二甲基二硫代氨基甲酸钠螯合沉淀锌和镍离子。当电镀废水中脂肪族多胺的质量浓度不高于于2.5 g/L时,锌和镍的出水浓度满足GB 21900–2008《电镀污染物排放标准》的"表2"要求;当脂肪族多胺低于0.5 g/L时,锌和镍的出水浓度满足GB 21900–2008的"表3"要求。The hydroxycarboxylic acid complexing agent in the wastewater discharged from Zn–Ni alloy electroplating process is oxidized by H2O2at pH8-13.The pH of the wastewater is then adjusted to4.5-5.5,decreasing the complexing power of aliphatic polyamine.The remaining hydrogen peroxide is reduced by sodium metabisulfite,and the Zn and Ni ions are precipitated by chelation with sodium dimethyldithiocarbamate.The effluent Zn and Ni concentrations meet the requirement of the Table2stipulated by the Emission Standard of Pollutants for Electroplating(GB21900-2008)when the influent mass concentration of aliphatic polyamine is not higher than2.5g/L,and even are compliant with the Table3of GB21900-2008when the mass concentration of aliphatic polyamine is lower than0.5g/L.

关 键 词：碱性锌镍合金电镀 废水处理 羟基羧酸 脂肪族多胺 双氧水 氧化 二甲基二硫代氨基甲酸钠 螯合沉淀 

分 类 号：TQ153.2[化学工程—电化学工业] X781.1[环境科学与工程—环境工程]