Photochemical Degradation of Aqueous Polyvinyl Alcohol in a Continuous UV/H2O2 Process: Experimental and Statistical Analysis
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- 作者：Dina Hamad ; Ramdhane Dhib ; Mehrab Mehrvar
- 关键词：Polyvinyl alcohol degradation ; Molecular weight measurements ; TOC removal ; Continuous UV/H2O2 photoreactor ; RSM ; H2O2 feeding strategy
- 刊名：Journal of Polymers and the Environment
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：24
- 期：1
- 页码：72-83
- 全文大小：1,577 KB
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Ramdhane Dhib (1)
Mehrab Mehrvar (1)
1. Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Polymer Sciences - 出版者：Springer Netherlands
- ISSN：1572-8900
文摘
Polyvinyl alcohol (PVA), being a dominant contributor of total organic carbon (TOC) in textile wastewater, is not easily degradable by conventional methods of wastewater treatment. This study investigates the degradation of aqueous PVA in a continuous UV/H2O2 photoreactor since the feeding strategy of hydrogen peroxide proves to have considerable effects on the process performance. Response surface methodology involving the Box–Behnken method is adopted for the experimental design to study the effects of operating parameters on the process performance. Experimental analysis shows that the TOC removal varies from 16.11 to 42.70 % along with a reduction of the PVA molecular weights from 56.7 to 95.3 %. The TOC removal is significantly lower than the molecular weight reduction due to the generation of the intermediate products during oxidation. Operating the UV/H2O2 process in a continuous mode facilitates the degradation of highly concentrated polymeric solutions using a relatively small hydrogen peroxide concentration in the feed with a small residence time ranges from 6.13 to 18.4 min.