title: Combined hydrolysis acidification and bio-contact oxidation system with air-lift tubes and activated carbon bioreactor for oilfield wastewater treatment.
abstract: This paper investigated the enhancement of the COD reduction of an oilfield wastewater treatment process by installing air-lift tubes and adding an activated carbon bioreactor (ACB) to form a combined hydrolysis acidification and bio-contact oxidation system with air-lift tubes (HA/air-lift BCO) and an ACB. Three heat-resistant bacterial strains were cultivated and subsequently applied in above pilot plant test. Installing air-lift tubes in aerobic tanks reduced the necessary air to water ratio from 20 to 5. Continuous operation of the HA/air-lift BCO system for 2 months with a hydraulic retention time of 36 h, a volumetric load of 0.14 kg COD/(m(3)d) (hydrolysis-acidification or anaerobic tank), and 0.06 kg COD/(m(3)d) (aerobic tanks) achieved an average reduction of COD by 60%, oil and grease by 62%, total suspended solids by 75%, and sulfides by 77%. With a COD load of 0.56 kg/(m(3)d), the average COD in the ACB effluent was 58 mg/L.
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
authors.forename: Chunmei
authors.initials: C
authors.lastname: Guo
authors.affiliation: Department of Environmental and Quality Management, Lanzhou Petrochemical Company, CNPC, Lanzhou 730060, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
authors.forename: Jinfu
authors.initials: J
authors.lastname: Chen
authors.affiliation: Lanzhou Huanqiu Contracting & Engineering Corp. Lanzhou 730060, China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
authors.forename: Guangqing
authors.initials: G
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
authors.forename: Jingxiu
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Environmental and Quality Management, Lanzhou Petrochemical Company, CNPC, Lanzhou 730060, China.
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Cui
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China. Electronic address: bjzzzhang@163.com.
authors.forename: Zhongzhi
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000143:Acids / Q000737:chemistry*; D000388:Air; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D002606:Charcoal / Q000737:chemistry*; D006838:Hydrocarbons / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D061329:Oil and Gas Fields / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D010578:Petroleum / Q000382:microbiology; D010865:Pilot Projects; D013696:Temperature; D062065:Wastewater / Q000737:chemistry* / Q000382:microbiology; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D000143:Acids; D002606:Charcoal; D006838:Hydrocarbons; D010100:Oxygen; D010578:Petroleum; D062065:Wastewater
keywords: Activated carbon bioreactor; Air-lift tubes; COD removal; Combined process; Oilfield wastewater treatment