Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31826
Title: The regeneration of field-spent granular-activated carbons
Authors: San Miguel, G
Lambert, SD
Graham, NJD
Keywords: Activated carbon
Regeneration
Catalysis
Metals
Calcium
Porosity
Issue Date: 2001
Publisher: IWA Publishing
Source: Water research, 2001, v. 35, no. 11, p. 2740-2748 How to cite?
Journal: Water research 
Abstract: The thermal regeneration of field-spent granular-activated carbons (GAC) is being increasingly adopted as a cost-effective alternative to disposal. The success of this practice requires the adjustment of process conditions to maximise the recovery of the original carbon characteristics while minimising carbon loss. This paper describes an investigation into the regeneration of several field-spent GAC representative of those typically generated by the drinking water treatment industry. The carbons were initially investigated for their ash contents and inorganic compositions in order to determine the accumulation of metallic species that affect the regeneration process. Regeneration was conducted in steam at 800°C over reaction times between 0 and 60 min in order to achieve different degrees of carbon gasification. Weight losses were determined for each condition and the resulting carbons characterised for their apparent density, porosity, surface area and aqueous adsorption characteristics. Results showed that spent carbons recovered most of their adsorption characteristics when heated to 800°C under inert conditions. Steam gasification in the range of 5–10 wt% burn-off had some positive effects on the characteristics of the spent carbons which were in most cases counteracted by a reduction in the carbon yield. Steam gasification in excess of 15 wt% burn-off caused a rapid increase in the carbon mesoporosity but a significant deterioration in the carbon microporosity, BET surface area and adsorption capacity for organic species of small molecular size.
URI: http://hdl.handle.net/10397/31826
ISSN: 0043-1354
EISSN: 1879-2448
DOI: 10.1016/S0043-1354(00)00549-2
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