Fenton-活性炭耦合陶瓷膜工艺深度处理电镀废水研究

Advanced Treatment of Electroplating Wastewater by Fenton-Activated Carbon Coupling Ceramic Membrane Process

为实现电镀废水的深度处理及回用,本文探究了芬顿(Fenton)-活性炭耦合陶瓷膜工艺处理电镀废水生化出水的最佳反应条件,处理效果,运行稳定性,膜污染规律与膜清洗效果。结果表明,当活性炭投加量为40 g/L、换炭量为4%/d、膜通量设置为70 L/(m^(2)·h)时,耦合工艺深度处理效果优异,经30 d运行,出水COD、TOC和浊度分别为14 mg/L、4.5 mg/L和0.04 NTU,去除率均可达到80%以上,满足《城市污水再生利用工业用水水质》(GB/T 19923-2005)标准。活性炭可吸附水中的污染物,增强该工艺对COD的去除效果,还可以有效减缓膜污染,延长膜的运行周期。被污染后的膜,依次经物理清洗和次氯酸钠清洗后,膜通量可恢复至原来的94%。Fenton-活性炭耦合陶瓷膜工艺处理电镀废水生化出水效果优异,具有长期运行稳定性,可作为深度处理工艺,实现电镀废水的深度处理及回用。

To realize the advanced treatment and recovery of electroplating wastewater,this paper investigated the optimal reaction conditions,treatment efficiency,operation stability,membrane fouling,and membrane cleaning efficiency during Fenton-activated carbon coupling ceramic membrane process treatment biochemical effluent of electroplating wastewater.The results showed that the concentrations of COD,TOC,and turbidity in effluent were 14 mg/L,4.5 mg/L,and 0.04 NTU with a removal efficiency of more than 80%after 30 days of operation under optimal conditions,where the dosage of activated carbon was 40 g/L with carbon exchange of 4%/d,and the membrane flux was set to be 70 L/(m^(2)·h).The effluent could meet the standard of the reuse of urban recycling water-Water quality standard for industrial uses(GB/T 19923-2005)for reuse.The addition of activated carbon could adsorb pollutants in wastewater and enhance the removal efficiency of COD,also can effectively alleviate membrane pollution and extend the operation cycle of the membrane.After the membrane fouling layer was formed,the membrane flux could be restored to 94%by physical cleaning and NaClO cleaning.The Fenton-activated carbon coupled with the ceramic membrane process has excellent treatment efficacy and long-term operation stability.It can be used as an advanced treatment process of electroplating wastewater biochemical effluent to realize the advanced treatment and reuse of electroplating wastewater.