膜技术在印刷线路板废水处理中的运用

Application of membrane technique to treatment of wastewater discharged from printed circuit board production

根据某线路板公司废水的来源和特点,采用膜技术进行处理,说明了去除机理和主要控制要点。经分类收集后,含镍废水、络合废水、有机废水等通过调整p H再加入Na2S生成沉淀,然后通过SQ膜处理器进行固液分离。过滤液与经二级破氰后的含氰废水汇总至p H回调池,经p H回调后入生化系统进一步去除有机物。结果表明,出水水质达标,系统运行情况稳定。

The wastewater discharged from a printed circuit board manufacturer was treated by membrane technique based on their origins and characteristics. The corresponding removal mechanisms and main control points were described. The process mainly includes： （1） collecting different types of wastewater separately; （2） adjusting the pH values of nickel-containing wastewater, complex wastewater, organic wastewater, etc.; （3） dosing Na2S for precipitation; （4） separating the solid and liquid by SQ membrane processor; （5） gathering the filtrates obtained with the cyanide-containing wastewater after two-stage decomposition of cyanides; （6） sending the mixed wastewater to the pH readjusting pool; and （7） sending the readjusted wastewater to a biochemical system for further removal of organic substances. The results showed that the effluent quality meets the emission standard and the system runs stably.