title: Naphthalene degradation in seawater by UV irradiation: the effects of fluence rate, salinity, temperature and initial concentration.
abstract: A large amount of oil pollution at sea is produced by the operational discharge of oily wastewater. The removal of polycyclic aromatic hydrocarbons (PAHs) from such sources using UV irradiation has become attractive, yet the photolysis mechanism in seawater has remained unclear. This study examines the photodegradation kinetics of naphthalene in natural seawater through a full factorial design of experiments (DOE). The effects of fluence rate, salinity, temperature and initial concentration are investigated. Results show that fluence rate, temperature and the interaction between temperature and initial concentration are the most influential factors. An increase in fluence rate can linearly promote the photodegradation process. Salinity increasingly impedes the removal of naphthalene because of the existence of free-radical scavengers and photon competitors. The results will help understand the photolysis mechanism of PAHs and develop more effective methods for treating oily seawater generated from offshore industries.
authors.affiliation: Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada.
authors.forename: Liang
authors.initials: L
authors.lastname: Jing
authors.affiliation: Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada. Electronic address: bchen@mun.ca.
authors.forename: Bing
authors.initials: B
authors.lastname: Chen
authors.affiliation: Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada.
authors.forename: Baiyu
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada.
authors.forename: Jisi
authors.initials: J
authors.lastname: Zheng
authors.affiliation: Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada.
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
mesh_terms: D007700:Kinetics; D009281:Naphthalenes / Q000737:chemistry*; D059392:Petroleum Pollution / Q000032:analysis*; D010782:Photolysis; D054712:Salinity; D012623:Seawater / Q000737:chemistry*; D013696:Temperature; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D009281:Naphthalenes; D014874:Water Pollutants, Chemical; C031721:naphthalene
keywords: Oil pollution; PAHs; Photodegradation kinetics; Seawater