title: Treatment of oilfield wastewater containing polymer by the batch activated sludge reactor combined with a zerovalent iron/EDTA/air system.
abstract: Laboratory-scale experiments were conducted in order to evaluate the performance of a novel treatment process for oilfield wastewater based on combining chemical oxidation, performed by a zerovalent iron (ZVI), ethylenediamine tetraacetic acid (EDTA) and air process, with biological degradation, carried out in a batch activated sludge reactor. The influence of some operating variables was studied. The results showed that the optimum pretreatment conditions were 150 mg/L EDTA, 20 g/L ZVI, and a 180-min reaction time, respectively. Under these conditions, removal efficiencies for hydrolyzed polyacrylamide (HPAM), total petroleum hydrocarbons (TPH), and chemical oxygen demand (COD) were 66%, 59%, and 45%, respectively. During the subsequent 40 h of bioremediation, the concentrations of HPAM, TPH, and COD were decreased to 10, 2 and 85 mg/L, respectively. At the end of experiments, the total removal efficiencies of HPAM, TPH, and COD were 96%, 97% and 92%, respectively.
authors.affiliation: School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi Province, China. bjlumang@hotmail.com
authors.forename: Mang
authors.initials: M
authors.lastname: Lu
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Wei
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000388:Air; D001673:Biodegradation, Environmental; D004492:Edetic Acid / Q000737:chemistry*; D007220:Industrial Waste / Q000517:prevention & control; D007501:Iron / Q000378:metabolism*; D010578:Petroleum / Q000382:microbiology*; D012722:Sewage / Q000382:microbiology*; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D004492:Edetic Acid; D007220:Industrial Waste; D007501:Iron; D010578:Petroleum; D012722:Sewage; D000099166:Polyacrylamides