Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, China; College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
Environ Pollut. 2021 Jan 15;269:116111. doi: 10.1016/j.envpol.2020.116111. Epub 2020 Nov 21.
Polymer flooding is one of the most important enhanced oil recovery techniques. However, a large amount of hydrolyzed polyacrylamide (HPAM)-containing wastewater is produced in the process of polymer flooding, and this poses a potential threat to the environment. In this study, the treatment of HPAM-containing wastewater was analyzed in an ozonic-anaerobic-aerobic multistage treatment process involving an ozone reactor (OR), an upflow anaerobic sludge blanket reactor (UASBR), and an aerobic biofilm reactor (ABR). At an HPAM concentration of 500 mg L and an ozone dose of 25 g O/g TOC, the HPAM removal rate reached 85.06%. With fracturing of the carbon chain, high-molecular-weight HPAM was degraded into low-molecular-weight compounds. Microbial communities in bioreactors were investigated via high-throughput sequencing, which revealed that norank_c_Bacteroidetes_vadinHA17, norank_f_Cytophagaceae, and Meiothermus were the dominant bacterial groups, and that Methanobacterium, norank_c_WCHA1-57, and Methanosaeta were the key archaeal genera. To the best of our knowledge, this is the first study in which HPAM-containing wastewater is treated using an ozonic-anaerobic-aerobic multistage treatment system. The ideal degradation performance and the presence of keystone microorganisms confirmed that the multistage treatment process is feasible for treatment of HPAM-containing wastewater.
聚合物驱是最重要的提高采收率技术之一。然而，在聚合物驱过程中会产生大量含有水解聚丙烯酰胺（HPAM）的废水，这对环境构成了潜在威胁。在本研究中，分析了臭氧化-厌氧-好氧多级处理工艺处理含 HPAM 废水的效果，该工艺包括臭氧反应器（OR）、上流式厌氧污泥床反应器（UASBR）和好氧生物膜反应器（ABR）。在 HPAM 浓度为 500mg/L 和臭氧剂量为 25g O/g TOC 的条件下，HPAM 的去除率达到 85.06%。通过碳链的断裂，高分子量的 HPAM 降解为低分子量的化合物。通过高通量测序研究了生物反应器中的微生物群落，结果表明 norank_c_Bacteroidetes_vadinHA17、norank_f_Cytophagaceae 和 Meiothermus 是优势细菌类群，Methanobacterium、norank_c_WCHA1-57 和 Methanosaeta 是关键的古菌属。据我们所知，这是首次使用臭氧化-厌氧-好氧多级处理系统处理含 HPAM 废水。理想的降解性能和关键微生物的存在证实了多级处理工艺处理含 HPAM 废水是可行的。
