混凝-Fenton氧化法处理制浆造纸厂生化出水的研究

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

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。

Aiming at the problems that it is difficult to reach the discharge standard for pulp and paper wastewatertreatment 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 sludgeoutput 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/Lof 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.