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Exploring the role of granular activated carbon in drinking water production

Ullberg, Malin (2022). Exploring the role of granular activated carbon in drinking water production. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-901-8
eISBN 978-91-7760-902-5
[Doctoral thesis]

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Abstract

Safe and clean drinking water is recognised as a human right by the United Nations, but water sources world-wide are affected by the widespread use of synthetic chemicals, creating a challenge that drinking water producers must address. Many of these synthetic chemicals, here referred to as organic micropollutants (OMPs), are not well removed by conventional drinking water treatment, and thus additional treatment steps are needed. Granular activated carbon (GAC) is a commonly used sorption material in water treatment processes. This thesis explores different roles of GAC filters in drinking water production: as a chemical barrier, as a biofilter, as a post-treatment step after ozonation and as a waste management step after nanofiltration. In two pilot-scale experimental set-ups, different kinds of raw and process water were treated in processes involving GAC filtration. Removal rates of a broad range of OMPs (including per- and polyfluoroalkyl substances; PFAS) were studied, along with microbial abundance and several parameters characterising natural organic matter (NOM) content. The results showed that GAC filters were more efficient with pre-ozonation, but the efficiency of OMP removal decreased over time. Inclusion of ozone treatment also introduced new challenges, as it was shown to increase bioavailability of NOM, which GAC filters were not fully able to remove. However, the GAC filters inevitably transitioned into biofilters over time, and these biofilters were able to remove more NOM when pre-ozonated. The in-depth information provided by this thesis on GAC filter performance over time under different conditions provides new insights into water treatment options to protect human health.

Authors/Creators:Ullberg, Malin
Title:Exploring the role of granular activated carbon in drinking water production
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number:2022:13
Number of Pages:82
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-901-8
ISBN for electronic version:978-91-7760-902-5
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 208 Environmental Biotechnology > Water Treatment
Keywords:Ozonation, biofiltration, assimilable organic carbon, flow cytometry, natural organic matter, organic micropollutants, PFASs, pilot-scale
URN:NBN:urn:nbn:se:slu:epsilon-p-116295
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116295
ID Code:27278
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:09 Mar 2022 13:25
Metadata Last Modified:09 Mar 2022 13:31

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