4.7 Article

Naphthalene degradation in seawater by UV irradiation: The effects of fluence rate, salinity, temperature and initial concentration

Journal

MARINE POLLUTION BULLETIN
Volume 81, Issue 1, Pages 149-156

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2014.02.003

Keywords

Oil pollution; Seawater; PAHs; Photodegradation kinetics

Funding

  1. Natural Sciences and Engineering Research Council of Canada (NSERC)
  2. Research & Development Corporation of Newfoundland and Labrador (RDC NL)
  3. Petroleum Research Newfoundland & Labrador (PRNL)
  4. Canada Foundation for Innovation (CFI)

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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. (C) 2014 Elsevier Ltd. All rights reserved.

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