Fenton氧化—生物接触氧化工艺处理甲醛和乌洛托品废水

Treatment of Wastewater Containing Formaldehyde and Urotropine by Fenton Reagent Oxidation-Biological Contact Oxidation Process

采用Fenton氧化—生物接触氧化工艺处理含甲醛和乌洛托品的模拟废水(简称废水),在H2O2(体积分数30%)加入量2.5g/L、H2O2与Fe2+质量浓度比3.75、反应时间3h、不调节废水初始pH的Fenton氧化预处理最佳操作条件下,废水COD从1000m g/L左右降至300m g/L,COD去除率达72%。原废水完全无法直接进行生化处理,经Fenton氧化预处理后其BOD5/COD约为0.5,易于生化处理。Fenton氧化—生物接触氧化工艺处理废水,生物接触氧化停留时间为12h时,废水COD去除率高达94%,处理后出水COD小于70m g/L,处理效果很好。

The simulated wastewater containing formaldehyde and urotropine was treated using Fenton reagent oxidation -biological contact oxidation process. Under the optimum pretreatment conditions of H2O2 （mass fraction 30% ） dosage 2.5 g/L, mass concentration ratio of H2O2 to Fe^2＋ 3.75, reaction time 3 h and without adjusting the initial pH, the COD of the wastewater is decreased from 1 000 mg/L to 300 mg/L with 72 % of COD removal rate. The wastewater pretreated by Fenton reagent oxidation, which is originally untreatable at all by biological process, becomes easily bio-treatable with about 0.5 of BODs/COD. When the hydraulic retention time in biological contact oxidation process is 12 h, the final treatment effect is very good with 94% of COD removal rate and below 70 mg/L of effluent COD.