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FENTON-DRIVEN REGENERATION OF GRANULAR ACTIVATED CARBON: A TECHNOLOGY OVERVIEW
HULING, S. G., R. G. ARNOLD, AND W. P. ELA. FENTON-DRIVEN REGENERATION OF GRANULAR ACTIVATED CARBON: A TECHNOLOGY OVERVIEW. Presented at 11th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air, and Soil, Chicago, IL, October 23 - 27, 2005.
A Fenton-driven mechanism for regenerating spent granular activated carbon (GAC) involves the combined, synergistic use of two reliable and well established treatment technologies - adsorption onto activated carbon and Fenton oxidation. During carbon adsorption treatment, environmental contaminants in fluids are removed, immobilized, and concentrated on the GAC. Subsequently, contaminants are transformed by hydroxyl radicals (⋅OH) and other reactive species generated during oxidative treatment with hydrogen peroxide (H2O2) and iron (Fe). The objective of the treatment process is to transform the contaminants into less toxic byproducts, re-establish the sorptive capacity of the carbon for the target chemical(s), increase the useful life of the GAC, and reduce costs for GAC regeneration and water or air treatment. The treatment process could be used on-site, in-situ in above-ground reactors or below ground in passive treatment barrier systems. Laboratory results are presented from various studies in which contaminants are adsorbed to GAC and subsequently oxidized via the Fenton-driven mechanism. Various parameters and mechanisms are identified that impact the effectiveness of Fenton regeneration efficiency. A summary of the potential successes and limitations of this technology are provided. Preliminary data and information are provided regarding ongoing and planned pilot-scale studies in which the technology is being evaluated under field conditions.