Journal
ENVIRONMENTAL TECHNOLOGY
Volume 37, Issue 21, Pages 2731-2742Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2016.1160959
Keywords
Polyvinyl alcohol; hydrogen peroxide feeding; molecular weight distribution; TOC removal; UV; H2O2 process; continuous photoreactor
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Ryerson University
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The performance of batch and fed-batch photoreactors with that of continuous photoreactor for the treatment of aqueous polyvinyl alcohol (PVA) solutions is compared. Hydrogen peroxide feeding strategies, residence time, and [H2O2]/[PVA] mass ratio are examined for their impacts on the molecular weight distribution (MWD) of PVA and the total organic carbon (TOC) removal. The results prove that a continuous addition of H2O2 during the degradation reaction ensures the utilization of the produced radicals to minimize the oxidant consumption and maximize the TOC removal and the PVA degradation in a short irradiation time. Also, the MWD of PVA is found to be bimodal and shifted towards lower molecular weights with small shoulder peak indicating a progressive disappearance of the higher molecular weight fractions that is in accordance with the random chains scission mechanism. Besides, the hydrogen peroxide feeding strategies are found to have a great effect on the reduction in H2O2 residuals in the effluent.
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