title: The effects of adsorbing organic pollutants from super heavy oil wastewater by lignite activated coke.
abstract: The adsorption of organic pollutants from super heavy oil wastewater (SHOW) by lignite activated coke (LAC) was investigated. Specifically, the effects of LAC adsorption on pH, BOD5/COD(Cr)(B/C), and the main pollutants before and after adsorption were examined. The removed organic pollutants were characterized by Fourier transform infrared spectroscopy (FTIR), Boehm titrations, gas chromatography-mass spectrometry (GC-MS), and liquid chromatography with organic carbon detection (LC-OCD). FTIR spectra indicated that organic pollutants containing -COOH and -NH2 functional groups were adsorbed from the SHOW. Boehm titrations further demonstrated that carboxyl, phenolic hydroxyl, and lactonic groups on the surface of the LAC increased. GC-MS showed that the removed main organic compounds are difficult to be degraded or extremely toxics to aquatic organisms. According to the results of LC-OCD, 30.37 mg/L of dissolved organic carbons were removed by LAC adsorption. Among these, hydrophobic organic contaminants accounted for 25.03 mg/L. Furthermore, LAC adsorption was found to increase pH and B/C ratio of the SHOW. The mechanisms of adsorption were found to involve between the hydrogen bonding and the functional groups of carboxylic, phenolic, and lactonic on the LAC surface. In summary, all these results demonstrated that LAC adsorption can remove bio-refractory DOCs, which is beneficial for biodegradation.
authors.affiliation: College of Chemical Engineering, China University of Petroleum, Qingdao 266555, China; National University Science Park, China University of Petroleum, Dongying 207062, China; Liaohe Petroleum Exploration Bureau, China National Petroleum Corporation, Beijing 102206,China.
authors.forename: Kun
authors.initials: K
authors.lastname: Tong
authors.affiliation: College of Chemical Engineering, China University of Petroleum, Qingdao 266555, China; National University Science Park, China University of Petroleum, Dongying 207062, China. Electronic address: lag@upc.edu.cn.
authors.forename: Aiguo
authors.initials: A
authors.lastname: Lin
authors.affiliation: Department of Environmental Engineering, Peking University, Beijing 100871,China. Electronic address: jiguodong@iee.pku.edu.cn.
authors.forename: Guodong
authors.initials: G
authors.lastname: Ji
authors.affiliation: Liaohe Petroleum Exploration Bureau, China National Petroleum Corporation, Beijing 102206,China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.affiliation: Liaohe Petroleum Exploration Bureau, China National Petroleum Corporation, Beijing 102206,China.
authors.forename: Xinghui
authors.initials: X
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D003031:Coal; D003077:Coke; D009930:Organic Chemicals / Q000737:chemistry*; D010578:Petroleum; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D003031:Coal; D003077:Coke; D009930:Organic Chemicals; D010578:Petroleum; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Adsorption; Biodegradability; Lignite activated coke; Super heavy oil wastewater