Surface water treatment by UV/H2O2 with subsequent soil aquifer treatment. Impact on micropollutants, dissolved organic matter and biological activity
Authors
Wünsch, Robin
Plattner, Julia
Cayon, David
Gebhardt, Jens
Wülser, Richard
von Gunten, Urs
Author (Corporation)
Publication date
2019
Typ of student thesis
Course of study
Collections
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Environmental Science. Water, Research & Technology
Special issue
DOI of the original publication
Link
Series
Series number
Volume
5
Issue / Number
10
Pages / Duration
1709-1722
Patent number
Publisher / Publishing institution
Royal Society of Chemistry
Place of publication / Event location
Edition
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Programming language
Assignee
Practice partner / Client
Abstract
Because organic micropollutants (MP) are frequently detected in river waters that are used as drinking water sources, combining a relatively cost-efficient natural treatment with upstream advanced oxidation processes (AOP) appears promising for their efficient abatement. Such a multi-barrier system can be integrated in drinking water production schemes to minimize risks from potentially hazardous MPs. This study investigates the impact of an UV/H2O2 AOP before soil aquifer treatment (SAT) on the abatement of selected MPs (EDTA, acesulfame, iopamidol, iomeprol, metformin, 1H-benzotriazole, iopromide), dissolved organic matter (DOM) (apparent molecular size distribution, specific UV absorbance at 254 nm – SUVA) and microbial parameters (intact cell count, cell-bound ATP). A pilot plant consisting of an AOP (0.5 m3 h−1, 4 mg L−1 H2O2, 6000 J m−2) and two parallel soil columns (filtration velocity: 1 m d−1, column height: 1 m) was continuously operated over a period of 15 months with Rhine river water pre-treated with rapid sand filtration. The investigations revealed a shift towards longer retention times of the humic substances peak in LC analysis of DOM, lower SUVA and higher biodegradability of DOM after UV/H2O2 treatment. In addition, an overall higher abatement of all investigated MPs by the combined treatment was observed (AOP with subsequent SAT) compared to either process alone. This observation could be explained by an addition of the single treatment effects. The strong primary disinfection effect of the AOP was detectable along the first meter of infiltration, but did not lead to any change in the column performance (i.e., similar abatement of dissolved organic matter).
Keywords
Micropollutants, Drinking water
Subject (DDC)
540 - Chemie
Event
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ISBN
ISSN
2053-1400
2053-1419
2053-1419
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Hybrid
License
Citation
WÜNSCH, Robin, Julia PLATTNER, David CAYON, Fabienne EUGSTER, Jens GEBHARDT, Richard WÜLSER, Urs VON GUNTEN und Thomas WINTGENS, 2019. Surface water treatment by UV/H2O2 with subsequent soil aquifer treatment. Impact on micropollutants, dissolved organic matter and biological activity. Environmental Science. Water, Research & Technology. 2019. Bd. 5, Nr. 10, S. 1709–1722. DOI 10.1039/C9EW00547A. Verfügbar unter: https://doi.org/10.26041/fhnw-4162