| Enhanced TCDD degradation by Fenton's reagent preoxidation. | |
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MedLine Citation:
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PMID: 10794914 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The dioxin isomer 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) has been called the most toxic compound known to man. Because of its poor bioavailability and low biodegradibility, bioremediation technology cannot effectively degrade TCDD when used alone. In this study, chemical pretreatment (partial oxidation) in combination with biodegradation technique was developed to efficiently remediate TCDD-contaminated soils. An oxidizing reagent [Fenton's Reagent (FR)] was applied in a slurry reactor to transform TCDD with a concentration of 96 microg per kg of soil to compounds more amenable to biodegradation. Up to 99% TCDD was transformed after the chemical pretreatment process. The slurry reactor was then converted to a bioreactor for the following biodegradation experiment. The detected TCDD oxidation byproducts including chlorophenols (CPs) and chlorobenzenes (CBs) were transformed in this bioreactor under aerobic conditions. Two other biodegradation experiments were performed in parallel to investigate the biodegradabiliy of TCDD under aerobic and anaerobic conditions without chemical pretreatment. Approximately 53% TCDD was transformed under anaerobic conditions possibly due to the reductive dechlorination process using organic materials contained in the activated sludge as the primary substrates. No TCDD degradation was observed under aerobic conditions. Results show that FR can oxidize TCDD to less-chlorinated and less-toxic byproducts, promoting their bioavailability to microbial communities. The bench-scale results indicate that the two-stage (partial oxidation followed by biodegradation) system has the potential to be developed to remediate TCDD-contaminated soils on-site. |
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Authors:
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C M Kao; M J Wu |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of hazardous materials Volume: 74 ISSN: 0304-3894 ISO Abbreviation: J. Hazard. Mater. Publication Date: 2000 Jun |
Date Detail:
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Created Date: 2000-07-28 Completed Date: 2000-07-28 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9422688 Medline TA: J Hazard Mater Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 197-211 Citation Subset: IM |
Affiliation:
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National Sun Yat-Sen University, Institute of Environmental Engineering, Kaohsiung, Taiwan. jkao@mail.nsysu.edu.tw |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biodegradation, Environmental Bioreactors Hydrogen Peroxide* Iron* Oxidation-Reduction Soil Pollutants / analysis* Tetrachlorodibenzodioxin / analysis, chemistry* Water Pollutants, Chemical / analysis* |
| Chemical | |
Reg. No./Substance:
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0/Fenton's reagent; 0/Soil Pollutants; 0/Water Pollutants, Chemical; 1746-01-6/Tetrachlorodibenzodioxin; 7439-89-6/Iron; 7722-84-1/Hydrogen Peroxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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