芬顿技术处理锌合金镀件电镀前处理废水

Treatment of wastewater from pretreatment of zinc alloy parts prior to plating by Fenton technology

采用芬顿技术处理COD_(cr)为1700~1800 mg/L的锌合金镀件(螺帽)电镀前处理废水,讨论了pH、Fe^(2+)与H_2O_2的质量浓度比、COD_(cr)与H_2O_2的质量浓度比以及反应时间对COD_(cr)去除率的影响,获得了最佳的工艺参数:pH=3.0,COD_(cr)与H_2O_2质量浓度比440:1,P(Fe^(2+)):P(H_2O_2)=10:1,反应时间30min。在上述最佳工艺条件下,废水中COD_(cr)去除率可以达到90%,处理后COD_(cr)低至200mg/L,有利于后续生化反应处理。

The wastewater containing 1 700-1 800 mg/L CODcr discharged from the pretreatment process for electroplating of zinc alloy screw caps was treated by Fenton technology. The effects of pH value, mass concentration ratios of Fe2＋ to H202, the ratio of CODcr to H202 content, and reaction time on CODcr removal efficiency were studied The optimal process parameters were determined as follows： pH 3.0, ratio of CODcr to H202 content 440：1, mass concentration ratio of Fe2＋ to H202 10：1, and reaction time 30 min. Under the optimal conditions, the CODcr removal efficiency reaches 90% and the effluent CODcr is decreased to 200 mg/L after treatment. The Fenton process is beneficial to the subsequent biochemical reaction treatment.