亚铁活化过硫酸钠氧化预处理电镀废水

针对电镀生产过程产生的难降解、高浓度的有机废水,采用Fe²⁺活化过硫酸钠产生硫酸根自由基的高级氧化技术对其进行预处理。重点探讨了S_2O_8^2-投加量、n(Fe²⁺)∶n(S_2O_8^2-)、废水pH等因素对有机物去除及废水可生化性的影响。实验结果表明,常温下,在S_2O_8^2-投加量为4.0 g/L、n(Fe²⁺)∶n(S_2O_8^2-)为1.00、废水pH为7.0的条件下,废水的处理效果最佳,反应20 min后COD去除率可达70%,BOD_5/COD从原水的0.21升至0.40,废水的可生化性大幅提高,能够满足深度生化处理的要求。

Pretreatment of electroplating wastewater by ferrous-activated sodium persulfate oxidation

The refractory and high concentration organic wastewater from electroplating production process was pretreated by the advanced oxidation process based on sulfate radical produced from Fe²⁺-activated Na₂S₂O₈. The effects of S₂O₈^2- amount,n（Fe²⁺）∶n（S₂O₈^2-）and wastewater pH on organics removal and wastewater biodegradability were studied. The experimental results indicated that the treatment effect of the wastewater was the best under the conditions of room temperature,S₂O₈^2- amount 4.0g/L,n（Fe²⁺）∶n（S₂O₈^2-）1.00 and wastewater pH 7.0. The COD removal rate reached 70% and BOD₅/COD increased from 0.21 to 0.40 after reaction for 20 min. The biodegradability of the wastewater was greatly improved,which met the requirements of advanced treatment by biochemical process.