Mn-Cu-Ce复合催化剂高效催化臭氧氧化深度处理印染废水

Advanced Treatment of Dye Wastewater by Mn/Cu/Ce Composite Catalyst with High Efficient Ozone Catalytic Oxidation

针对某化工企业染料废水生化处理后出水提标改造需求,利用以活性炭为载体,Mn-Cu为活性组分,掺杂稀土元素Ce的复合催化剂进行催化臭氧氧化深度处理该染料废水,探讨去除COD和苯胺的效果,确定最佳工艺参数,进行连续实验观察运行效果及出水水质稳定性。实验结果表明:在废水初始pH=6.5,采用连续流体固定床催化剂一次投加量为100 g/L,固液体积比1∶10,臭氧投加量为0.60 g/L反应45 min,COD的去除率能达到73.62%。中试实验中,催化剂连续重复使用半个月后COD去除率稳定在72%以上,苯胺去除率稳定在95%以上,出水COD在65~75 mg/L,苯胺质量浓度在0.71~0.93 mg/L,可以稳定达到行业排放标准。

In order to meet the need of a chemical enterprise for upgrading dye wastewater after biochemical treatment to improve water standard requirements,the dye waste water was treated by catalytic ozonation with activated carbon as carrier,Mn,Cu as active component,rare earth element Ce as ozone catalytic oxidation of composite catalyst in order to explore the effect of the removal of COD and aniline,determine the best process parameters,and conduct continuous opera-tion and water quality stability test observation.The experimental results show that the removal rate of COD couldreach 73.62%when the initial pH of wastewater was 6.5;the catalyst dosage of continuous fluid fixed bed was 100g/L;the ratio of solid to liquid was 1∶10;and the ozone dosage was 0.60g/L.In the pilot test,after continuous repeated use of the catalyst for half a month,the COD removal rate and aniline removal rate were stable at more than 72%and 95%respectively;the effluent COD was in the range of 65-75mg/L and the aniline concentration was in the range of 0.71-0.93mg/L,which couldstably meet the industry discharge standards.