Water extractable organic matter (WEOM) as an indicator of granular activated carbon (GAC) bed life and water quality outcomes in drinking water treatment

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Title: Water extractable organic matter (WEOM) as an indicator of granular activated carbon (GAC) bed life and water quality outcomes in drinking water treatment
Authors: Ritson, JP
Graham, NJD
Item Type: Journal Article
Abstract: Granular activated carbon (GAC) is often used in drinking water treatment to remove dissolved organic carbon (DOC), taste and odour compounds, and organic micro-pollutants. As these chemicals are adsorbed onto the GAC surface, the area available for further adsorption decreases, meaning that the removal of target compounds decreases over time. Ascertaining the correct point to regenerate the GAC is a critical parameter in terms of both water quality performance and operational expenditure for the water company. Using a test case of a UK water treatment works with five GAC beds of varying age we show that current practices of using time-in-use are ineffective for optimal removal of DOC and disinfection by-product precursors. Our data show that assessment of the water extractable organic matter (WEOM) adsorbed onto the GAC can give an accurate indicator of both DOC removal (adjusted R2 = 0.985, p = 0.001, n = 5) and reduction in trihalomethane formation (adjusted R2 = 0.970, p = 0.001, n = 5). These results suggest that simple methods using equipment commonly available at treatment works could be adopted for rapid assessment of remaining GAC bed life.
Issue Date: 1-Sep-2019
Date of Acceptance: 23-Jul-2019
URI: http://hdl.handle.net/10044/1/73312
DOI: https://doi.org/10.1039/c9ew00303g
ISSN: 2053-1400
Publisher: Royal Society of Chemistry (RSC)
Start Page: 1593
End Page: 1598
Journal / Book Title: Environmental Science: Water Research & Technology
Volume: 5
Issue: 9
Copyright Statement: © 2019 Royal Society of Chemistry.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: 144356 (EP/N010124/1)
Publication Status: Published
Embargo Date: 2020-07-25
Online Publication Date: 2019-07-25
Appears in Collections:Civil and Environmental Engineering



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