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  

Effect of sludge reflux ratio on performance of two step-feed A/O process in treating heavy oil refining wastewater

作　　者：李长刚 阎光绪 郭绍辉 李倩玮 LI Changgang;YAN Guangxu;GUO Shaohui;LI Qianwei(Beijing Key Laboratory of Oil ＆ Gas Pollution Control,College of Science,China University of Petroleum（Beijing）,Beijing 102249,China)

机构地区：[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

出　　处：《环境工程学报》2018年第10期2751-2757,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金联合基金资助项目(U1462201)

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。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.

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 

分 类 号：X703.1[环境科学与工程—环境工程]