絮凝-Fenton试剂氧化处理印染废水

采用Fenton试剂对某染袜厂2种印染废水(印染红和印染蓝)进行处理。考察了硫酸亚铁投加量、双氧水投加量、反应时间及pH值对印染废水的色度及COD去除率的影响,通过正交实验确定了Fenton试剂处理该废水的最佳操作条件为:反应时间30 min、双氧水(30%)投加量4 mL/L、硫酸亚铁投加量300 mg/L、pH值为4左右。在最佳条件下,印染蓝废水经氧化处理后COD去除率大于80%,色度去除率95%以上;印染红废水需经絮凝预处理后再用Fenton试剂氧化处理,其脱色率达到了99.6%,COD去除率为91.2%,出水COD浓度为96 mg/L,可达标排放。

Oxidation treatment of printing and dyeing wastewater by flocculation-Fenton reagent

Fenton reagent was employed to treat two kinds of printing and dyeing wastewaters (printing and dyeing red and printing and dyeing blue). The effects of FeSO₄ dosage, H₂O₂ dosage, reaction time and pH on removal efficiencies of chroma and COD of the wastewater were investigated. The optimal operating conditions determined by orthogonal experiments are as follows:FeSO₄] = 300 mg/L,H₂O₂] = 4 mL/L, 30 min at pH=4. Under these conditions, the removal rate of COD of printing and dyeing blue wastewater was more than 80% after oxidation treatment; chroma removal rate was over 95%. Dyeing and printing red wastewater should be treated by flocculation pretreatment before being oxidized by Fenton reagent, the chroma removal rate reached 99.6%, COD removal rate was 91.2%, effluent COD concentration was 96 mg/L and can meet the national drainage criterion.