Water extractable organic matter (WEOM) as an indicator of granular activated carbon (GAC) bed life and water quality outcomes in drinking water treatment. Issue 9 (29th July 2019)

• Record Type: Journal Article
• Authors: Ritson, J. P.; Graham, N. J. D.
• Is Part Of: Environmental science. Volume 5:Issue 9(2019)
• Page Start: 1593
• Page End: 1598
• Publication Date: 2019-07-29
• Subjects: Water-supply -- Periodicals; Water security -- Periodicals; Water resources development -- Periodicals; Water chemistry -- Periodicals; 553.705
• DOI: 10.1039/c9ew00303g
• Languages: English
• ISSNs: 2053-1400

Abstract

Abstract : Simple extraction and quantification of adsorbed organic carbon can effectively assess granular activated carbon bed file. 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 R 2 = 0.985, p = 0.001, n = 5) and reduction in trihalomethane formation (adjusted R 2 = 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.