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.
作者
郭崇武
赖奂汶
陈康
GUO Chong-wu;LAI Huan-wen;CHEN Kang(Guangzhou Ultra Union Chemicals Ltd., Guangzhou 510460, China)
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2018年第3期137-141,共5页
Electroplating & Finishing
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
alkaline zinc–nickel alloy electroplating
wastewater treatment
hydroxycarboxylic acid
aliphatic polyamine
hydrogen peroxide
oxidation
sodium dimethyldithiocarbamate
chelation precipitation
作者简介
郭崇武(1960–),男,吉林辉南人,学士,腐蚀与防护高级工程师,从事电镀添加剂与电镀工艺开发工作,在国内外发表论文150 余篇,获得国内专利授权10 项,中国表面工程协会专家库专家,《电镀与精饰》杂志编委,广州市发明协会理事。(E-mail) chongwu.guo@ultra-union.com。
