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Simultaneous Use of Dispensers and Advanced Oxidation Processes for Degradation of Oil Polluted Water

Derakhshandeh, Reza | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 47793 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Abrishamchi, Ahmad
  7. Abstract:
  8. Chemical dispersants applied to the surface of Persian Gulf during the oil spill in 2010 were more than one million gallons. Following the addition of dispersants, oil mixes below the seawater surface and can be degraded or dissolved into the water column. The aforementioned condition is a perfect opportunity for degradation of organic pollutants using Ultraviolet light emitting diodes Advanced Oxidation Processes (AOPs). These methods are based on activation of oxidants such as persulfate and hydrogen peroxide to generate extremely reactive radicals. Dispersants would increase the degradation rate by providing more active area (homogenous solution) for these radicals. AOPs have shown to have promising results in degradation of organic matters including oil; however simultaneous use of chemical dispersants and AOPs have not been studied to the best of our knowledge. Our purpose is to introduce a potential response action method, which not only dissolves the oil but can also degrade organic pollutants. It would decrease the carbon mineralization rate which would lead to faster restoration of environment. The study is comprised of two major steps. The first step simulated the oil spill in a laboratory at a small scale using benzene. Two common dispersants were used to make the water/benzene solution homogenous. Degradation rate was calculated using different AOPs such as, UV/S2O82-, UV/ H2O2, and combination or sequential addition of oxidants using different dispersants both in quality and quantity. Following the optimization of conditions in laboratory, three groups of samples; a) polluted water without dispenser b) polluted water treated by dispenser, and c) polluted water treated by both dispensers and AOPs were studied. The influences of operational parameters such as: the initial concentration of S2O8-2, Dispersant, Benzene, reaction time on the degradation of Benzene were studied. The obtained results showed that the highest degradation rate occurred during the first 30 min of the reaction time. Under optimal conditions, for the highest (100 mg/L) and lowest (25 mg/L) concentration of Benzene, the chemical oxygen reduction reached about 84% to 98%, respectively for the UV/S2O8-2 system during the 40 min. A kinetic analysis has been done which showed that a pseudo-first-order kinetic model with respect to Benzene concentration can be used to explain the Benzene degradation for UV/S2O8-2 system
  9. Keywords:
  10. Oil Pollution ; Advanced Oxidation Process ; Oil From Water Separation ; Dispersants ; Total Organic Carbon (TOC)

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