Abstract
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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