焙烧再生废旧臭氧催化剂处理石化废水生化出水

为了解决臭氧催化氧化技术中废旧催化剂处理困难的问题，对用于某石化废水生化出水处理长达5年的废旧臭氧催化剂进行了焙烧再生研究.通过焙烧能够有效燃烧去除催化剂表面及孔隙中的有机物质，增大催化剂孔径和孔隙率，从而恢复废旧催化剂的部分活性.单因素试验对催化剂焙烧温度和焙烧时间优化结果表明：(1)随着焙烧温度从200℃提高到500℃，再生催化剂用于臭氧催化对石化废水生化出水TOC(总有机碳)的去除效果逐渐提升，500℃时TOC去除率可达44.30%，进一步提高焙烧温度去除效果提升不明显.(2)焙烧时间为2、3、4和5 h时，再生催化剂处理石化废水效能随焙烧时间增加先升高再降低，4 h时TOC去除效果最好.(3)在相同运行条件下，优化焙烧条件(500℃、4 h)下得到的再生催化剂对石化废水生化出水的TOC去除率可达新催化剂的77.46%，相较于新催化剂，再生催化剂的颗粒尺寸和平均孔径减小，而比表面积有所增大.(4)通过皮尔逊相关性分析，探索了废水中有机物和三维荧光测试结果的相关性，认为荧光区域积分体积可以间接反映石化废水中的有机物含量，也可间接反映臭氧再生催化剂的催化性能.研究显示，直接焙烧可以作...

Roasting and Regeneration of Spent Ozone Catalyst for Treatment of Petrochemical Wastewater Biochemical Effluent

In order to solve the problem of difficult disposal of spent catalysts in ozone catalytic oxidation technology, the roasting and regeneration of spent ozone catalyst used in the biochemical effluent treatment of a petrochemical wastewater for 5 years was studied. The calcination could effectively remove the organic matter on the surface and pore of the catalyst, increase the pore size, increase the specific surface area and porosity of the catalyst, and restore part of the activity of the spent catalyst. The catalyst calcination temperature and calcination time were optimized by single factor experiment. The results show that: (1) With the increase of the roasting temperature from 200 ℃ to 500 ℃, the removal effect of the regenerated catalyst for ozone catalysis on the biochemical effluent of petrochemical wastewater was gradually improved, and the TOC removal rate reached 44.30% at 500 ℃, further increasing the roasting temperature did not improve the TOC removal rate significantly. (2) When the roasting time was 2, 3, 4 and 5 h, the efficiency of the regenerated catalyst to treat petrochemical wastewater increased first and then decreased with the increase of the roasting time, and the TOC removal rate was the highest at 4 h. (3) Under the same operating conditions, the TOC removal rate of the regenerated catalyst obtained under the optimized roasting conditions (500 ℃, 4 h) in the biochemical effluent of petrochemical wastewater could reach 77.46% of that of the new catalyst. Compared with the new catalyst, the particle size and average pore size of the regenerated catalyst were reduced, and the specific surface area was increased. The study also explored the correlation between the organic matter in the wastewater and the results of three-dimensional fluorescence test through Pearson correlation analysis. (4) The analysis showed that the integrated volume of fluorescence area indirectly reflected the content of the organic matter in petrochemical wastewater, and can indirectly reflect the catalytic performance of ozone regeneration catalyst. The study has shown that direct roasting can be used as an effective technical means to regenerate the activity of spent ozone catalysts and has certain application prospects.