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  4. Application of UV absorbance and electron-donating capacity as surrogates for micropollutant abatement during full-scale ozonation of secondary-treated wastewater
 
research article

Application of UV absorbance and electron-donating capacity as surrogates for micropollutant abatement during full-scale ozonation of secondary-treated wastewater

Walpen, Nicolas
•
Joss, Adriano
•
von Gunten, Urs  
February 1, 2022
Water Research

Ozonation of secondary-treated wastewater for the abatement of micropollutants requires a reliable control of ozone doses. Changes in the UV absorbance of dissolved organic matter (DOM) during ozonation allow to estimate micropollutant abatement on-line and were therefore identified as feed-back control parameter. In this study, the suitability of the electron-donating capacity (EDC) as an additional surrogate parameter which is independent of optical DOM properties was evaluated during full-scale ozonation. For this purpose, a recently developed EDC analyzer was enhanced to enable continuous on-line EDC and UV absorbance measurements. During a multi-week monitoring campaign at the wastewater treatment plant of Zurich, Switzerland, specific ozone doses were varied from 0.13 to 0.91 mg(O3).mg(DOC)(-1) and selected micropollutants with different ozone reactivities were analyzed by LC-MS in conjunction with bromate analysis by IC-MS. In agreement with previous laboratory studies, the relative residual UV absorbance and EDC both decreased exponentially as a function of the specific ozone dose and, in comparison to the residual UV absorbance, residual EDC values showed a more pronounced decrease at low specific ozone doses <= 0.34 mg(O3).mg(DOC)(-1). Logistic regression models allowed to estimate relative residual micropollutant concentrations in the ozonation effluent using either the residual UV absorbance or EDC as explanatory variable. Averaging those models along the explanatory variables allowed to estimate target values in relative residual UV absorbances and EDC for specific micropollutant abatement targets. In addition, both parameters allowed to identify conditions with elevated conversions of bromide to bromate. Taken together, these findings show that the integration of relative residual EDC values as a second control parameter can improve existing absorbance-based ozonation control systems to meet micropollutant abatement targets, particularly for treatment systems where low ozone doses are applied.

  • Details
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Type
research article
DOI
10.1016/j.watres.2021.117858
Web of Science ID

WOS:000758696700004

Author(s)
Walpen, Nicolas
Joss, Adriano
von Gunten, Urs  
Date Issued

2022-02-01

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

Published in
Water Research
Volume

209

Article Number

117858

Subjects

Engineering, Environmental

•

Environmental Sciences

•

Water Resources

•

Engineering

•

Environmental Sciences & Ecology

•

ozonation

•

micropollutant abatement

•

electron-donating capacity

•

uv absorbance

•

on-line monitoring

•

dissolved organic-matter

•

bromate formation

•

ozone decomposition

•

chemical oxidation

•

removal efficiency

•

correlation models

•

initial phase

•

transformation

•

kinetics

•

bromide

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTQE  
Available on Infoscience
March 28, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/186678
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