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Thermal regeneration of spent and acidwashed GAC from the Upper Occoquan Sewage Authority

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The thermal regeneration of spent granular activated carbon (GAC) at the Upper Occoquan Sewage Authority (UOSA) was investigated as a function of time, temperature, and the amount of applied oxidants. The GAC was also acid-washed to remove metals and then regenerated to study acid-washing's effect on adsorption. The regenerations were conducted with a batch-feed, fluidized-bed furnace. GAC quality was evaluated by measuring apparent density, pore size distribution, surface area, and adsorption capacity. Spent and regenerated GAC from UOSA's system and virgin carbon of the same type were studied. Isotherms for system GAC regenerated to various apparent densities showed little difference in dissolved organic carbon (DOC) capacity. Regeneration of acid-washed GAC resulted in lower mass and volume losses without sacrificing adsorption capacity, but a longer regeneration time was necessary to achieve a desired apparent density. Based on DOC adsorption behavior, recovering the virgin GAC apparent density does not appear to be a beneficial regeneration strategy for UOSA.
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Keywords: acid washing; activated carbon; adsorption; thermal regeneration

Document Type: Research Article

Publication date: 1994-05-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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