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Study of UV/Chlorine Photolysis in regard to the Advanced Oxidation Processes (AOPs) Open Access
- Other title
Advanced oxidation, chlorine photolysis, hydroxyl radicals, methanol, p-chlorobenzoic acid, cyclohexanoic acid
- Type of item
- Degree grantor
University of Alberta
- Author or creator
- Supervisor and department
Mohammed Gamal El-Din (Department of Civil and Environmental Engineering)
James R. Bolton (Department of Civil and Environmental Engineering)
- Examining committee member and department
Jonathan G. C. Veinot (Department of Chemistry)
Yang Liu (Department of Civil and Environmental Engineering)
Department of Civil and Environmental Engineering
- Date accepted
- Graduation date
Master of Science
- Degree level
This thesis aims mainly at investigating the potential oxidizing abilities and possible applications of the UV/Chlorine process as an Advanced Oxidation Process (AOP).
Several organic compounds were used and added into the samples as challenging radical scavengers to investigate the possibilities of the UV/Chlorine process being used in the water and wastewater treatment industry. The UV/H2O2 process was selected as a reference, and experiments were carried out parallel; the results obtained earlier in the UV/Chlorine process were compared to those of the UV/H2O2 process.
Methanol was added into active chlorine solutions at both pH 5 and 10. The quantum yields for the degradation of active chlorine were calculated after the samples had been exposed to UV. Also the production of ∙OH radicals was calculated by determining the generation of formaldehyde. The OH radical yield factors, which are significant in evaluating AOPs, were calculated both in the UV/Chlorine and the UV/H2O2 processes. In addition to methanol, para-chlorobenzoic acid (pCBA) and cyclohexanoic acid (CHA) were added to active chlorine solutions and to H2O2 solutions. The first-order reaction rate constants for the oxidation of pCBA and CHA using the UV/Chlorine process were calculated and compared to those of the UV/H2O2 process. This allowed an evaluation of whether or not the UV/Chlorine process might be efficient for the treatment of contaminated water samples containing pCBA and/or CHA.
Finally the thesis comes to a general conclusion about the efficiency of the UV/Chlorine process compared to that of the UV/H2O2 process.
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