| 臭氧-曝气生物滤池组合工艺处理石化二级出水的试验研究 |
| 摘要点击 2594 全文点击 1312 投稿时间：2013-05-17 修订日期：2013-10-09 |
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| 中文关键词 石化二级出水 臭氧-曝气生物滤池 深度处理 相对分子质量分布 三维荧光光谱 |
| 英文关键词 petrochemical secondary effluent ozone-biological aerated filter advanced treatment relative molecular mass distribution three-dimensional fluorescence spectra |
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| 中文摘要 |
| 采用臭氧-曝气生物滤池组合工艺对石化废水厂二级出水进行深度处理，系统探讨了pH值对臭氧氧化单元的影响，组合工艺对废水中COD、UV254的去除效果，对废水中有机物相对分子质量分布以及荧光物质含量的影响. 结果表明，在臭氧投加量为10 mg·L-1，接触时间为4 min，pH值偏碱性时，臭氧预氧化石化二级出水效果较好. 臭氧氧化能将大分子有机物转化为小分子物质，使得相对分子质量小于1000的有机物比例增加约15%，有效提高了废水的可生化性，有利于后续曝气生物滤池的运行. 在曝气生物滤池的停留时间为3 h，气水比为3：1时，组合工艺对COD、UV254的去除率分别达到40.8%和45.8%. 在最佳运行条件下，进水平均COD为86.5 mg·L-1时，组合工艺出水平均COD为49.4 mg·L-1. |
| 英文摘要 |
| The advanced treatment of petrochemical secondary wastewater by ozone- aerated biological filter was carried out in this study. The effect of pH on ozonation and the removal of COD and UV254 by the ozone-aerated biological filter combined process were investigated. In addition, the variation of relative molecular mass distribution of organics and the characteristics of three-dimensional fluorescence spectra of the wastewater were also investigated. The results showed that the suitable operating conditions of the ozonation unit were: ozone dosage 10 mg·L-1, contact time 4 min and slightly alkaline pH. Ozonation can transfer macromolecular organics into small molecular organics, resulting in a 15% increase in the percentage of the organics with small relative molecular mass (less than 1000). The biodegradability of the petrochemical secondary effluent was significantly improved by ozonation, making it more suitable for the treatment by aerated biological filter. The removal efficiency of COD and UV254 were 40.8% and 45.8% when the hydraulic retention time was 3 hours and the gas to water ratio was 3:1 for BAF. The average COD of the petrochemical wastewater was 86.5 mg·L-1 while the average COD of the effluent of the combined process was 49.4 mg·L-1 when it was operated under optimal conditions. |
