SHIShuo,WANGQiao,WANGYi-xiao,et al.Industrial Application of Catalytic Ozonation for Advanced Treatment of Petrochemical Wastewater[J].China Water & Wastewater,2024,40(9):35-41.
催化臭氧氧化深度处理石化废水的工业化应用研究
- Title:
- Industrial Application of Catalytic Ozonation for Advanced Treatment of Petrochemical Wastewater
- 摘要:
- 选用硅基负载铁、硅铝基负载铈、硅基负载铁锰3种商用臭氧催化剂（分别记作硅基、硅铝基、硅碳催化剂），对比其催化臭氧氧化深度处理石化废水的效果，选出催化活性较高且金属浸出量最少的催化剂，从而实现臭氧催化剂的工业化应用。首先通过催化剂表征和吸附实验发现，硅铝基催化剂表面有较多的沟壑，其比表面积较大，吸附能力较强，且使用后比表面积和抗压强度会增加；而硅基催化剂不具备研究价值。其次采用两种商用臭氧催化剂处理石化废水二级出水，结果表明，硅铝基催化剂催化臭氧氧化可以去除24%的TOC和36%的COD，满足工业化应用要求且优于硅碳催化剂。最后研究发现，硅铝基催化剂和硅碳催化剂在第一次使用后会有大量的金属浸出，在使用5次后硅铝基催化剂的金属浸出量趋于0，且其可以保持催化活性达10次；而硅碳催化剂在使用8次后，其催化效果已劣于单独臭氧。综合对比可知，硅铝基催化剂可以达到深度处理石化废水的工业化应用要求。
- Abstract:
- This paper compared the performances of three commercial catalysts,which were silicon-based supported iron catalysts (referred to silicon-based catalyst), silicon-aluminum based supported cerium catalysts (referred to Si-Al based catalyst) and silicon-based supported iron manganese catalysts (referred to Si-C catalyst), for catalytic ozonation of petrochemical wastewater to determine the catalyst with high catalytic activity and the minimum metal leaching amount, so as to achieve industrial application of ozonation catalysts. Firstly, the catalyst characterization and adsorption experiments showed that the Si-Al based catalyst had more gullies on the surface, larger specific surface area and stronger adsorption capacity, and its specific surface area and compressive strength increased after use. By contrast, the silicon?based catalyst had no prospect for further exploration. Secondly, two commercial ozonation catalysts were employed to treat secondary effluent from a petrochemical wastewater treatment plant. The Si-Al based catalyst demonstrated removal rates of 24% for TOC and 36% for COD, which met the requirements of industrial application and showed superior performance compared with Si-C catalyst. In the end, a large amount of metal leaching was observed after the first use of the Si-Al based catalyst and Si-C catalyst, the metal leaching amount of the Si-Al based catalyst tended to be zero after the reuse of 5 times, and the catalytic activity could be maintained for 10 times of reuse. By contrast, the catalytic activity of Si-C catalyst was worse than that of ozonation alone after 8 times of reuse. The comprehensive comparison results showed that the Si-Al based catalyst met the industrial application requirements for advanced treatment of petrochemical wastewater.
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