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Journal of Polymers and the Environment

, Volume 24, Issue 1, pp 72–83 | Cite as

Photochemical Degradation of Aqueous Polyvinyl Alcohol in a Continuous UV/H2O2 Process: Experimental and Statistical Analysis

  • Dina Hamad
  • Ramdhane Dhib
  • Mehrab Mehrvar
Original Paper

Abstract

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.

Keywords

Polyvinyl alcohol degradation Molecular weight measurements TOC removal Continuous UV/H2O2 photoreactor RSM H2O2 feeding strategy 

Abbreviations

ANOVA

Analysis of variance

AOP

Advanced oxidation process

BBD

Box–Behnken design

ε

Statistical residual

GPC

Gel permeation chromatography

p-value

Probability value

PAA

Polyacrylic acid

PAM

Polyacrylamide

PEG

Polyethylene glycol

PEO

Polyethylene oxide

PVA

Polyvinyl alcohol

QP

Quadratic programming

RSM

Response surface methodology

TOC

Total organic carbon

UV

Ultraviolet

List of symbols

x1

PVA inlet concentration (mg/L)

x2

Hydrogen peroxide inlet concentration (mg/L)

x3

Feed flow rate (mL/min)

y1

TOC removal (%)

y2

PVA molecular weight (kg/mol)

y3

Hydrogen peroxide residual (%)

Notes

Acknowledgments

The financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC) and Ryerson University is gratefully appreciated.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Chemical EngineeringRyerson UniversityTorontoCanada

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