Mn-Fe-Ce/γ-Al2O3催化剂的制备及其在奶牛养殖废水处理中的臭氧催化氧化性能  

Preparation of Mn-Fe-Ce/γ-Al2O3 catalyst and its ozone catalytic oxidation performance in dairy farming wastewater treatment

作　　者：李家耀 宋卫锋[1] 李秋华 余泽峰 冯嘉颖 杜璞欣 LI Jiayao;SONG Weifeng;LI Qiuhua;YU Zefeng;FENG Jiaying;DU Puxin(College of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学环境科学与工程学院,广州510006

出　　处：《环境工程学报》2020年第4期875-883,共9页Chinese Journal of Environmental Engineering

基　　金：广东省科技计划项目(2014A020209077)。

摘　　要：不同地区的奶牛养殖废水水质具有地域性。在南方地区,常规处理工艺出水COD和色度普遍偏高,臭氧催化氧化是一种非常有潜力的技术。采用优化的浸渍焙烧的制备方法,以γ-Al2O3为载体,制备了Mn-FeCe/γ-Al2O3催化剂,并对其性状进行了表征。将该催化剂用于实际奶牛养殖废水一级好氧池出水的臭氧氧化中,结果表明:经含锰、铁和铈化合物的前驱体浸渍液浸渍并进行焙烧方法得到的Mn-Fe-Ce/γ-Al2O3催化剂对奶牛养殖废水有较好的催化性能;在臭氧投加量为12.5 mg·(L·min)-1,催化剂投加量为60 g,反应20 min的条件下,COD去除率由使用γ-Al2O3时的20.4%提高到48.9%,单独使用臭氧时仅为13.8%;色度去除率可达95%;BOD5/COD达到0.54。臭氧催化氧化不仅可以去除COD和色度,而且有效改善了可生化性,为氧化出水继续使用生化法创造了条件。添加TBA作为HO·的淬灭剂实验结果表明,HO·在体系中起主要作用。研究结果可为奶牛养殖废水处理提供新的技术方法。The quality of dairy farming wastewater has regional characteristic. In the southern region, COD and chroma in the effluents of conventional treatment processes are generally high. Catalytic ozonation is a kind of promising technology. The Mn-Fe-Ce/γ-Al2O3 catalyst was prepared with a γ-Al2O3 carrier and the optimized impregnation-calcination method, and its properties were characterized, then it was used to ozone oxidize the effluent from the first aerobic tank treating the actual dairy farming wastewater. The results showed that the catalyst prepared by impregnation with precursor impregnating solution containing manganese compound, iron compound and cerium compound, and calcination treatment, had good catalytic performance on the dairy farming wastewater degradation. At the ozone dosage of 12.5 mg·(L·min)-1 and the catalyst dosage of 60 g, the COD removal efficiency increased to 48.9% after 20 min oxidation, while the COD removal efficiency was only20.4% when using γ-Al2O3, and was 13.8% when using ozone alone. The removal efficiency of chroma reached95% and the BOD5/COD reached 0.54. Catalytic ozonation could not only remove COD and chroma, but also ameliorate biodegradability effectively, which created the conditions for the subsequent biochemical treatment of above oxidized effluent. Further experiment results of adding HO· quenchers of TBA showed that HO· plays a major role in the system. The above results provide a new technical method for the treatment of dairy farming wastewater.

关 键 词：Mn-Fe-Ce/γ-Al2O3 非均相 臭氧催化氧化 奶牛养殖废水 HO·介导 

分 类 号：X703[环境科学与工程—环境工程]