Deleterious effects of inorganic compounds DURING THERMAL REGENERATION of GAC: A Review

Granular activated carbon (GAC) is used extensively to remove organic micropollutants during the treatment of potable waters. Once exhausted, its adsorption capacity is normally restored by thermal regeneration and the GAC is reused. However, substantial amounts of inorganic compounds accumulate on...

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Bibliographic Details
Published inJournal - American Water Works Association Vol. 94; no. 12; pp. 109 - 119
Main Authors LAMBERT, STEVEN D., SAN MIGUEL, GUILLERMO, GRAHAM, NIGEL J.D.
Format Journal Article
LanguageEnglish
Published Denver, CO American Water Works Association 01.12.2002
Subjects
Activated carbon
Adsorbents
Adsorption
Aluminum
Applied sciences
Calcium
Carbon
Carbonates
Catalysis
Costs
Decomposition
Drinking water and swimming-pool water. Desalination
Exact sciences and technology
Filters
Flue gas
Gases
Gasification
Granular Activated Carbon
Inorganic Compounds
Magnesium
Metals
Odor
Oxidation
Oxides
Pollutants
Pollution
Potable water
Potassium
Recycling
Regeneration
Steam
Sulfides
Temperature
United Kingdom
Utilities
Water treatment
Water treatment and pollution
United States > US
Drinking water treatment
Heat treatment
Hydroxides
Carbon dioxide
Oxides
Review
Sulfates
Inorganic compound
Regeneration
Sulfides
Adsorption
Granular material
Activated carbon
Chlorides
Carbonates
Catalyst activity
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Summary:Granular activated carbon (GAC) is used extensively to remove organic micropollutants during the treatment of potable waters. Once exhausted, its adsorption capacity is normally restored by thermal regeneration and the GAC is reused. However, substantial amounts of inorganic compounds accumulate on GAC filter media; this is important because many metal species catalyze the reactions that occur during the thermal regeneration of spent GAC adsorbents. These metals may consequently cause a deterioration of the adsorbent's porous characteristics, as well as high pH, high dissolved‐metal concentrations, and high chlorine demand in treated waters. By gradually accumulating over the GAC surface, they also potentially interfere with the adsorption and microbial support capabilities of regenerated GAC media. This article reviews the process of thermal GAC regeneration and the effects that may occur as a result of adsorbed inorganic compounds.
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ISSN:0003-150X
1551-8833
DOI:10.1002/j.1551-8833.2002.tb10253.x