混凝-Fenton氧化法处理制浆造纸厂生化出水的研究

针对制浆造纸废水二级生化处理难以实现达标排放的问题,对比研究了混凝法、Fenton氧化法及混凝-Fenton氧化法作为深度处理技术对其二级生化出水的处理效果,并分析了污泥产量和经济性。结果表明:混凝-Fenton氧化法是较适用于制浆造纸生化出水深度处理的技术,其预处理混凝阶段投加350 mg/L的Al_2(SO_4)_3和0.5 mg/L的阳离子聚丙烯酰胺,并根据混凝出水COD按n(H_2O_2)∶n(COD)∶n(Fe SO4)=2∶1∶1投加H_2O_2和FeSO_4,处理后出水可满足国家排放标准的要求。混凝-Fenton氧化法的污泥产量约为0.85 g/L。

Research on the treatment of pulp and paper biochemical effluent by coagulation-Fenton oxidation process

Aiming at the problems that it is difficult to reach the discharge standard for pulp and paper wastewater treatment by secondary biological processes,the treatment effects of coagulation,Fenton oxidation,and coagula?tion-Fenton oxidation methods on the secondary biochemical effluent are contrasted and researched,and the sludge output and its economic efficiency analyzed. The results indicate that coagulation-Fenton oxidation method is com?paratively suitable for the advanced treatment technology of pulp and paper secondary biological effluent. 350 mg/L of Al2(SO4)3 and 0.5 mg/L of cationic polyacrylamide(CPAM)are added in its pretreatment coagulation stage,and ac?cording to the coagulation effluent COD,H2O2 and FeSO4 are added,and the ratio of them is n(H2O2)∶n(COD)∶n(FeSO4)=2∶1∶1. The treated effluent can meet the requirements for the state discharge standard. The sludge out?put of coagulation-Fenton process is about 0.85 g/L.