Methodologies for overcoming pH excursions for reactivated granular activated carbon: Effect on adsorption performance

Morgana T. Bach; David W. Mazyck

doi:10.1089/ees.2006.0215

Methodologies for overcoming pH excursions for reactivated granular activated carbon: Effect on adsorption performance

Morgana T. Bach, David W. Mazyck

School of Engineering Design and Innovation

Research output: Contribution to journal › Article › peer-review

Abstract

Water treatment facilities report that when reactivated granular activated carbon (GAC) is returned to service, pH excursions may occur, resulting in high pH of the treated water (e.g., pH > 9) as a result of a calcium chemistry mechanism. While air treatments and carbon dioxide (CO₂) treatments following reactivation and prior to return to service create pH stable carbons (pH < 8.5), there has been no study on the impact of these treatments on the subsequent performance of the GAC. In a comparison of adsorption performance for 2-methylisoborneol (MIB), a common taste- and odor-causing compound, untreated reactivated GAC removed more MIB than the air-treated reactivated GAC in organic free water, while this trend was reversed when natural organic matter was present. In both waters, the CO₂-treated reactivated GAC removed the greatest quantity of MIB. CO₂ was proven effective since it deterred water adsorption, which is deleterious to MIB adsorption.

Original language	English (US)
Pages (from-to)	1105-1111
Number of pages	7
Journal	Environmental Engineering Science
Volume	24
Issue number	8
DOIs	https://doi.org/10.1089/ees.2006.0215
State	Published - Oct 1 2007

All Science Journal Classification (ASJC) codes

Environmental Chemistry
Waste Management and Disposal
Pollution

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title = "Methodologies for overcoming pH excursions for reactivated granular activated carbon: Effect on adsorption performance",

abstract = "Water treatment facilities report that when reactivated granular activated carbon (GAC) is returned to service, pH excursions may occur, resulting in high pH of the treated water (e.g., pH > 9) as a result of a calcium chemistry mechanism. While air treatments and carbon dioxide (CO2) treatments following reactivation and prior to return to service create pH stable carbons (pH < 8.5), there has been no study on the impact of these treatments on the subsequent performance of the GAC. In a comparison of adsorption performance for 2-methylisoborneol (MIB), a common taste- and odor-causing compound, untreated reactivated GAC removed more MIB than the air-treated reactivated GAC in organic free water, while this trend was reversed when natural organic matter was present. In both waters, the CO2-treated reactivated GAC removed the greatest quantity of MIB. CO2 was proven effective since it deterred water adsorption, which is deleterious to MIB adsorption.",

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Methodologies for overcoming pH excursions for reactivated granular activated carbon: Effect on adsorption performance

Abstract

All Science Journal Classification (ASJC) codes

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