阎光绪1,
郭绍辉1,
李倩玮1
1.中国石油大学（北京）理学院，油气污染防治北京市重点实验室，北京102249
基金项目: 国家自然科学基金联合基金资助项目（U1462201）
Effect of sludge reflux ratio on performance of two step-feed A/O process in treating heavy oil refining wastewater
LI Changgang1,,YAN Guangxu1,
GUO Shaohui1,
LI Qianwei1
1.Beijing Key Laboratory of Oil & Gas Pollution Control, College of Science, China University of Petroleum Beijing, Beijing 102249, China
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摘要:采用2段进水A/O中试系统处理重油加工污水处理系统的水解酸化单元出水，重点考察了污泥回流比（r）对系统性能的影响。结果表明，r值的变化对氮污染物的去除效果影响较大，对有机物的去除影响较小。在r值由0.60增加到1.25的过程中，尽管水量处理负荷在增加，污水、污泥和污染物的停留时间在减少，但是系统硝化和反硝化效果均明显提升。当r值高于1.25时，第1段缺氧区的硝酸盐氮去除量明显增加,但是系统硝化、反硝化效果均降低。当r值为1.25时,系统总氮去除率最高，为73.38%。此外，相对于传统的A/O工艺，2段进水A/O工艺污染物的停留时间更长，更有利于提高重油加工污水中难降解有机污染物的去除效果。
关键词: 重油加工污水/
2段进水A/O工艺/
污泥回流比/
处理效果
Abstract:The effect of sludge recycle ratio (r) on the performance of the two step-feed A/O process was investigated in a pilot-scale reactor, where the effluent from the hydrolysis and acidification unit of the heavy oil refining wastewater was taken as the treating object. The results showed that the change of r values had a relatively high effect on the nitrogen removal but a slight effect on the organic pollutants removal. As r value increased from 0.60 to 1.25, both the nitrification and denitrification performances of the two step-feed A/O process were significantly improved though the wastewater treatment load increased and the residence time of wastewater, sludge and pollutant decreased. When the r value was higher than 1.25, both the nitrification and denitrification effects decreased, even if a marked increase of the nitrate removal occurred in the first anoxic zone.The highest total nitrogen removal efficiency was observed as 73.38% at r value of 1.25. In addition, the longer residence time of pollutant in step-feed A/O process in comparison with a traditional A/O process could contribute to the enhancement of the refractory organic pollutants degradation in heavy oil refining wastewater.
Key words:heavy oil refining wastewater/
two step-feed A/O process/
sludge reflux ratio/
removal efficiency.
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污泥回流比对2段进水A/O工艺处理重油加工污水效果的影响
李长刚1,,阎光绪1,
郭绍辉1,
李倩玮1
1.中国石油大学（北京）理学院，油气污染防治北京市重点实验室，北京102249
基金项目: 国家自然科学基金联合基金资助项目（U1462201）
关键词: 重油加工污水/
2段进水A/O工艺/
污泥回流比/
处理效果
摘要:采用2段进水A/O中试系统处理重油加工污水处理系统的水解酸化单元出水，重点考察了污泥回流比（r）对系统性能的影响。结果表明，r值的变化对氮污染物的去除效果影响较大，对有机物的去除影响较小。在r值由0.60增加到1.25的过程中，尽管水量处理负荷在增加，污水、污泥和污染物的停留时间在减少，但是系统硝化和反硝化效果均明显提升。当r值高于1.25时，第1段缺氧区的硝酸盐氮去除量明显增加,但是系统硝化、反硝化效果均降低。当r值为1.25时,系统总氮去除率最高，为73.38%。此外，相对于传统的A/O工艺，2段进水A/O工艺污染物的停留时间更长，更有利于提高重油加工污水中难降解有机污染物的去除效果。
English Abstract
Effect of sludge reflux ratio on performance of two step-feed A/O process in treating heavy oil refining wastewater
LI Changgang1,,YAN Guangxu1,
GUO Shaohui1,
LI Qianwei1
1.Beijing Key Laboratory of Oil & Gas Pollution Control, College of Science, China University of Petroleum Beijing, Beijing 102249, China
Keywords: heavy oil refining wastewater/
two step-feed A/O process/
sludge reflux ratio/
removal efficiency
Abstract:The effect of sludge recycle ratio (r) on the performance of the two step-feed A/O process was investigated in a pilot-scale reactor, where the effluent from the hydrolysis and acidification unit of the heavy oil refining wastewater was taken as the treating object. The results showed that the change of r values had a relatively high effect on the nitrogen removal but a slight effect on the organic pollutants removal. As r value increased from 0.60 to 1.25, both the nitrification and denitrification performances of the two step-feed A/O process were significantly improved though the wastewater treatment load increased and the residence time of wastewater, sludge and pollutant decreased. When the r value was higher than 1.25, both the nitrification and denitrification effects decreased, even if a marked increase of the nitrate removal occurred in the first anoxic zone.The highest total nitrogen removal efficiency was observed as 73.38% at r value of 1.25. In addition, the longer residence time of pollutant in step-feed A/O process in comparison with a traditional A/O process could contribute to the enhancement of the refractory organic pollutants degradation in heavy oil refining wastewater.
