title: Treatment of oilfield fracturing wastewater by a sequential combination of flocculation, Fenton oxidation and SBR process.
abstract: In this study, a combined process was developed that included flocculation, Fenton oxidation and sequencing batch reactor (SBR) to treat oilfield fracturing wastewater (FW). Flocculation and Fenton oxidation were applied to reduce chemical oxygen demand (COD) organic load and to enhance biodegradability, respectively. For flocculation, the optimum conditions were: polymeric aluminium chloride dosage, 40 mg/L; polyacrylamide dosage, 4 mg/L; dilution ratio, 1:2 and stirring time, 30 min. For Fenton oxidation, a total reaction time of 60 min, a H₂O₂dosage of 2 m mol/L, with a [H₂O₂]/[FeSO₄] ratio of 2 were selected to achieve optimum oxidation. Under these optimum flocculation and Fenton oxidation conditions, the COD removal efficiency was found to be 76.6%. Following pretreatment with flocculation and Fenton oxidation, the FW was further remediated using a SBR. Results show that COD was reduced to 92 mg/L, and the overall water quality of the final effluent could meet the class I national wastewater discharge standard of petrochemical industry of China.
authors.affiliation: a Key Laboratory of Crops with High Quality and Efficient Cultivation and Security Control , Yunnan Higher Education Institutions, Honghe University , Mengzi 661199 , Yunnan , People's Republic of China.
authors.forename: Jian
authors.initials: J
authors.lastname: Yang
authors.forename: Liang
authors.initials: L
authors.lastname: Hong
authors.forename: Yan-Hong
authors.initials: YH
authors.lastname: Liu
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Guo
authors.forename: Li-Fei
authors.initials: LF
authors.lastname: Lin
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000536:Aluminum Hydroxide / Q000737:chemistry; D019149:Bioreactors; D005296:Ferrous Compounds / Q000737:chemistry; D005427:Flocculation; D006861:Hydrogen Peroxide / Q000737:chemistry; D007220:Industrial Waste; D061329:Oil and Gas Fields; D010084:Oxidation-Reduction; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D000536:Aluminum Hydroxide; D005296:Ferrous Compounds; D006861:Hydrogen Peroxide; D007220:Industrial Waste; D012722:Sewage; D062065:Wastewater; D000099166:Polyacrylamides; C016213:aluminum oxychloride; C020748:ferrous sulfate
keywords: biodegradability; flocculation; fracturing wastewater; orthogonal experiment; pretreatment