title: Advanced treatment of oilfield production wastewater by an integration of coagulation/flotation, catalytic ozonation and biological processes.
abstract: In this study, advanced treatment of heavily polluted oilfield production wastewater (OPW) was investigated employing the combination of coagulation/dissolved air flotation, heterogeneous catalytic ozonation and sequencing batch reactor (SBR) processes. Two SBR reactors were separately set up before and after the ozonation unit. The results show that microbubble flotation was more efficient than macrobubble flotation in pollutant removal. Catalytic ozonation with the prepared Fe/activated carbon catalyst significantly enhanced pollutant removal in the second SBR by improving wastewater biodegradability and reducing wastewater microtoxicity. The treatment technique decreased oil, chemical oxygen demand and NH3-N by about 97%, 88% and 91%, respectively, allowing the discharge limits to be met. Therefore, the integrated process with efficient, economical and sustainable advantages was suitable for advanced treatment of real OPW.
authors.affiliation: a College of Energy Resources , Chengdu University of Technology , Chengdu , People's Republic of China.
authors.forename: Ke-Yong
authors.initials: KY
authors.lastname: Chen
authors.affiliation: a College of Energy Resources , Chengdu University of Technology , Chengdu , People's Republic of China.
authors.forename: Xiao-Bing
authors.initials: XB
authors.lastname: Zhang
authors.affiliation: a College of Energy Resources , Chengdu University of Technology , Chengdu , People's Republic of China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
mesh_terms: D057919:Biological Oxygen Demand Analysis; D005427:Flocculation; D007220:Industrial Waste; D061329:Oil and Gas Fields / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D010126:Ozone; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Coagulation; catalyst; heterogeneous catalytic ozonation; microtoxicity; oilfield production wastewater