摘要
采用一种改进的电去离子装置处理电镀含铜废水,考察了电极室溶液和操作电压对处理效果的影响。结果表明,特殊的膜堆构造使得装置的浓室始终保持酸性环境,抑制了铜离子在阴离子交换膜表面形成氢氧化铜沉淀,克服了传统电去离子过程中普遍存在的二价金属离子氢氧化物沉淀现象。电极室溶液中加入少量Na2SO4电解质和增大操作电压可显著提高废水处理效果。运行过程中铜离子浓缩倍数5～14,铜离子去除率大于99.5%,出水中铜离子浓度低于0.25 mg.L-1,可达标排放或循环利用。
An improved EDI membrane stack was adopted to treat electroplating wastewater containing copper ions,and effects of electrode solution as well as applied voltage on removal of copper ions were investigated.The result showed that the special configuration of the membrane stack could keep the concentrate compartment solution acidic,and this acidic environment was very favorable for avoiding the precipitation of bivalent metal hydroxide on the surface of the anion exchange membrane.Addition of a small amount of Na2SO4 into the electrode solution and moderate increase of applied voltage could get better treatment effect.Copper ion enrichment multiple of 5～14,removal efficiency of more than 99.5% and final concentration of less than 0.25 mg·L-1 were achieved,and the purified water could be discharged or recycled.
出处
《水处理技术》
CAS
CSCD
北大核心
2011年第7期96-98,122,共4页
Technology of Water Treatment
基金
华北水利水电学院高层次人才科研启动项目(003019)
河南省软科学研究计划项目(102400430062)
关键词
电去离子(EDI)
电镀废水
沉淀
铜离子
electrodeionization（EDI）
electroplating wastewater
precipitation
copper ion
