Journal article
Comparison of mineral and soluble iron Fenton's catalysts for the treatment of trichloroethylene
Water research (Oxford), Vol.35(4), pp.977-984
2001
Handle:
https://hdl.handle.net/2376/101174
PMID: 11235893
Abstract
Contaminant degradation, stoichiometry, and role of hydroxyl radicals (OH
·) in four Fenton's systems were investigated using trichloroethylene (TCE) as a model contaminant. A standard Fenton's system, a modified soluble iron system with a pulse input of hydrogen peroxide, and two modified mineral-catalyzed systems (pH 3 and 7) were studied. In the standard Fenton's system, which had the most efficient reaction stoichiometry, 78% of the TCE was degraded; however, chloride analysis indicated that no more than two of the three chlorines were displaced per TCE molecule degraded. Although the modified soluble iron system was characterized by 91% TCE degradation, chloride analysis also indicated that no more than two of the chlorines were lost from the TCE. In the goethite system of pH 3, >99% of the TCE was degraded. Near-complete release of chloride suggested that the TCE may have been mineralized. Only 22% degradation of TCE was achieved in the pH 7 goethite system, and there was minimal release of chloride. The mineral-catalyzed reactions exhibited the least efficient reaction stoichiometry of the four systems. Experiments using hydroxyl radical scavengers showed that the standard Fenton's system degraded TCE entirely by hydroxyl radical mechanisms, while approximately 10–15% of the degradation achieved in the modified soluble iron and goethite-catalyzed systems at pH 3 was mediated by non-hydroxyl radical mechanisms. In the goethite system at pH 7, only non-hydroxyl radical mechanisms were found. The goethite-catalyzed system at pH 3 effectively degraded the parent compound and may have the potential to mineralize contaminants when used for
in situ soil and groundwater remediation and
ex situ waste stream treatment in packed-bed reactors.
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Details
- Title
- Comparison of mineral and soluble iron Fenton's catalysts for the treatment of trichloroethylene
- Creators
- Amy L Teel - Department of Civil & Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USAChristopher R Warberg - Department of Civil & Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USADavid A Atkinson - Chemical Materials and Processes, Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID 83415, USARichard J Watts - Department of Civil & Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USA
- Publication Details
- Water research (Oxford), Vol.35(4), pp.977-984
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900546530101842
- Language
- English
- Resource Type
- Journal article