Fenton试剂氧化—原水调节出水pH法预处理碱性印染废水

Pretreatment of Alkaline Dyeing Wastewater by Fenton Reagent Oxidation-Effluent pH Adjustment with Raw Wastewater

采用Fenton试剂氧化—原水调节出水pH法预处理碱性印染废水,考察了n(H_2O_2):n(Fe^(2+))、Fenton试剂加入量、反应时间和原水与Fenton试剂氧化反应后出水体积比(配水比)对COD去除率及废水pH的影响。实验结果表明,在原水COD为986 mg/L、原水pH为9.31、Fe^(2+)加入量为12 mmol/L、n(H_2O_2):n(Fe^(2+))为2、反应时间为30 min、配水比为2的最佳条件下,COD去除率为26.9%,出水pH为6.60。药剂成本较普通Fenton试剂氧化法减少70%。

Dyeing wastewater was pretreated by the process of Fenton reagent oxidation-effluent pH adjustment with raw wastewater. The factors affecting the COD removal rate and wastewater pH were studied. Under the optimum conditions of raw wastewater COD 986 mg/L, raw wastewater pH 9.31, Fe2＋ dosage 12 mmol/L, n（H202） ： n（Fe2＋）=2, reaction time 30 min and volume ratio of raw wastewater to oxidation effluent 2, the COD removal rate is 26.9% and the effluent pH is 6.60. Compared with normal Fenton oxidation process, the cost for reagent is decreased by 70%.