硅藻土强化混凝处理线路板含络合铜废水

摘要

Diatomite was used to enhance the coagulation capabilities of poly ferric sulfate(PFS) and poly aluminum chloride(PAC) for removal of copper from printed circuit board(PCB) wastewater containing complex copper.The factors affecting the copper removal were studied and the copper removal effects were compared with that by common Na2S method.The experimental results show that:The copper removal effect by diatomite-enhanced coagulation is far better than that by PAC coagulation or PFS coagulation; The copper removal effect by PFS-diatomite is better than that by PAC-diatomite; Under the conditions of pH 8.0-9.0,diatomite dosage 120 mg/L,PFS dosage 60 mg/L,mixing speed 250 r/min and precipitation time 40 min,the copper mass concentration in the effluent is lower than 0.3 mg/L.Comparing with traditional method,the effluent quality is more stable and the cost is lower.%采用硅藻土对聚合硫酸铁(PFS)、聚合氯化铝(PAC)的混凝能力进行强化,并用于线路板含络合铜废水中铜的去除.考察了硅藻土加入量、混凝剂加入量、pH、快速搅拌速率和沉淀时间等因素对除铜效果的影响,并与目前常用的硫化钠破络方法进行了对比.实验结果表明:硅藻土强化混凝的除铜效果明显好于单独投加PAC或PFS; PFS-硅藻土除铜效果好于PAC-硅藻土；在pH为8.0～9.0、硅藻土加入量为120 mg/L、PFS加入量为60 mg/L、快速搅拌速率为250 r/min的条件下,沉淀40 min后可使出水铜质量浓度低于0.30 mg/L,比传统破络工艺出水水质更稳定,成本更低.