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However, the extensive use of alkaline materials makes it difficult to treat the water used. Here, an improved multi-zone anaerobic baffled reactor (ABR) using FeSO<jats:sub>4<\/jats:sub> as electron acceptor was employed to treat the wastewater from ASP flooding technology, and the effects on major pollutants (hydrolyzed polyacrylamide, petroleum substances, surfactants suspended solids) and associated parameters (chemical oxygen demand, viscosity) were evaluated. Gas chromatography-mass spectrometry (GC-MS) was used to follow the degradation and evolution of organic compounds while high-throughput DNA sequencing was used to determine the bacterial diversity in the ABR. The results obtained after 90 d of operation showed decreases in all parameters measured and the highest mean removal rates were obtained for petroleum substances (98.8%) and suspended solids (77.0%). Amounts of petroleum substances in the ABR effluent could meet the requirements of a national standard for oilfield reinjection water. GC-MS analysis showed that a wide range of chemicals (e.g. aromatic hydrocarbons, esters, alcohols, ketones) could be sequentially removed from the influent by each zone of ABR. The high-throughput DNA sequencing showed that the bacteria <jats:italic>Micropruina<\/jats:italic>, <jats:italic>Saccharibacteria<\/jats:italic> and <jats:italic>Synergistaceae<\/jats:italic> were involved in the degradation of pollutants in the anaerobic and anoxic reaction zones, while <jats:italic>Rhodobacteraceae<\/jats:italic> and <jats:italic>Aliihoeflea<\/jats:italic> were the main functional microorganisms in the aerobic reaction zones. The results demonstrated that the improved ABR reactor had the potential for the treatment of wastewater from ASP flooding technology.<\/jats:p>","DOI":"10.1371\/journal.pone.0261458","type":"journal-article","created":{"date-parts":[[2022,1,7]],"date-time":"2022-01-07T18:22:37Z","timestamp":1641579757000},"page":"e0261458","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":10,"title":["Efficiency and bacterial diversity of an improved anaerobic baffled reactor for the remediation of wastewater from\u00a0alkaline-surfactant-polymer (ASP) flooding 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