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  

Treatment of Petrochemical Secondary Effluent by Ozone-biological Aerated Filter

作　　者：刘明国[1,2] 吴昌永[2] 周岳溪[2] 高祯[3] 王佩超[4] 杨琦[1] 董德[5] 

机构地区：[1]中国地质大学水资源与环境学院,北京100083 [2]中国环境科学研究院水污染控制技术研究中心,北京100012 [3]河北工程大学城市建设学院,邯郸056038 [4]大连海洋大学海洋科技与环境学院,大连116032 [5]中国石油吉林石化公司物资采购公司,吉林132000

出　　处：《环境科学》2014年第2期651-656,共6页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07201-005);国家自然科学基金项目(51208484)

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1 000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.The advanced treatment of petrochemical secondary wastewater by ozone- aerated biological fiher 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 1 000）. 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-~ while the average COD of the effluent of the combined process was 49.4 mg.L-1 when it was operated under optimal conditions.

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 

分 类 号：X703.1[环境科学与工程—环境工程]