焙烧再生废旧臭氧催化剂处理石化废水生化出水
Roasting and regenerating waste ozone catalyst for treatment of petrochemical wastewater biochemical effluent
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摘要: 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。结果表明: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。在焙烧时间为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呈现先升高再降低的趋势,焙烧时间为4 h时TOC去除效果最高;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%。研究同时探索了废水中有机物和三维荧光测试结果的相关性,分析表明荧光区域积分体积可以间接反映石化废水中有机物含量,并可间接反映臭氧再生催化剂的催化性能。研究显示,直接焙烧可以作为废旧臭氧催化剂活性再生的一种有效技术手段。Abstract: The roasting and regeneration of waste ozone catalyst used in the biochemical effluent treatment of a petrochemical wastewater for 5 years was studied. The results show that 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 is gradually improved, and the TOC removal rate can reach 44.30% at 500 ℃, further increasing the roasting temperature does not improve the TOC removal rate significantly. When the roasting time was 2, 3, 4 and 5 h, the efficiency of the regenerated catalyst in treating petrochemical wastewater showed a trend of increasing first and then decreasing with the increase of the roasting time, and the TOC removal rate was the highest when toasting time was 4 h. Under the same operating conditions, the TOC removal rate of the regenerated catalyst obtained under the optimized roasting condition (500 ℃;4 h) in the biochemical effluent of petrochemical wastewater can reach 77.46% of that of the new catalyst. The study also explored the correlation between organic matter in wastewater and the results of three-dimensional fluorescence test. The analysis showed that the integrated volume of fluorescence area can indirectly reflect the content of 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.
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Key words:
- waste catalysts /
- regeneration /
- roast /
- ozone /
- catalytic oxidation
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