采用“臭氧-粉末活性炭-曝气生物滤池”组合工艺深度处理印染废水

Advanced treatment of dyeing wastewater by ozone-powdered activated carbon-biological aerated filter combined process

采用"臭氧-微量粉末活性炭-曝气生物滤池"组合工艺,考察了苏南某污水处理厂二级出水深度处理的运行效果及作为回用水的可行性。结果表明,当投加的臭氧和粉末活性炭质量浓度分别为25mg/L和20 mg/L,曝气生物滤池的水力停留时间为6 h,气水比为3∶1时,组合工艺出水的ρ(COD)和ρ(NH3-N)平均值分别为49 mg/L和0.28 mg/L,出水平均色度为7,平均脱色率达90%,满足回用水水质要求。检测发现,臭氧氧化和粉末活性炭吸附对可溶性微生物产物有较高的去除率。

According to the characteristics of secondary effluent from a wastewater treatment plant in southern Jiangsu Province,the effect and feasibility of advanced treatment of dyeing wastewater by the ozone-powdered activated carbon（PAC）-biological aerated filter（BAF） combined process for the reuse of dyeing wastewater were studied.The results show the following： when the concentrations of ozone and powdered activated carbon were 25 mg/L and 20 mg/L,respectively,the hydraulic retention time of BAF was six hours,and the gas-water ratio was 3∶1,the average ρ（COD） and ρ（NH3-N） in the effluent were 49 mg/L and 0.28 mg/L,respectively,the mean chromaticity was seven times,and the mean decolorization rate was 90%,indicating that the effluent could meet the water quality requirements for reuse.Detection shows that the removal rate of soluble microbial products was high with the use of ozone oxidation and powdered activated carbon adsorption.