高铁酸钾辅助PAC混凝沉淀+电化学氧化处理乳化液废水研究

Study on joint treatment of emulsion wastewater by potassium ferrate-assisted PAC coagulation precipitation and electrochemical oxidation

以金属加工业实际乳化液废水为研究对象,采用K_(2)Fe O_(4)辅助聚合氯化铝(PAC)混凝沉淀、后接BDD电化学氧化的两段组合工艺进行实验研究,考察了PAC和K_(2)Fe O_(4)质量浓度、沉降时间、电流密度以及两段工艺的初始p H和反应温度等参数对污染物处理效果的影响。结果表明,K_(2)Fe O_(4)与PAC混合使用可有效促进PAC的絮凝沉淀效果;BDD阳极电解对絮凝沉淀处理后的剩余CODCr可形成高效矿化。分别对絮凝沉淀工艺段和电解工艺段各参数对污染物去除效果的影响进行讨论。CODCr、NH3-N、浊度等主要指标均达到GB 8978—1996污水综合排放一级标准。

Taking an actual emulsion wastewater from metal processing industry as research object,a two-stage combined process containing K_(2)Fe O_(4) assisted polyaluminum chloride( PAC) coagulation precipitation method followed by boron-doped diamond electrode( BDD) electrochemical oxidation method is studied. Influences of the mass concentrations PAC and K_(2)Fe O_(4),sedimentation time,current density,initial p H and reaction temperature of the two-stage process on the pollutant treatment effect are investigated. It is shown that the mixed use of K_(2)Fe O_(4) and PAC can effectively promote the flocculation and sedimentation effect of PAC,and BDD anode electrolysis can form efficient mineralization of the remaining CODCrafter flocculation and precipitation. Main indexes such as CODCr,NH3-N and turbidity all meet China’ first-class standard of integrated wastewater discharge( GB 8978—1996).