Catalyzed hydrogen peroxide treatment of polychlorinated biphenyl contaminated sandy soils

This paper reports the results of the treatment of polychlorinatedbiphenyl (PCB) contaminated sandy soils (100 mg kg^sup -1^ Aroclor 1242) with the Fenton advanced oxidation process (AOP). The results obtained in the various assays permitted the optimization of conditions as follows: 5% H^sub 2^O^su...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2004-05, Vol.154 (1-4), p.57-69
Main Authors: Manzano, M.A, Perales, J.A, Sales, D, Quiroga, J.M
Format: Article
Language:English
Subjects:
Applied sciences
Aroclor 1242
Biodegradation
Biological
chemical reactions
Congeners
Contamination
Dechlorination
Decontamination. Miscellaneous
Degradation
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental monitoring
Exact sciences and technology
Fenton reaction
Hydrogen peroxide
iron
Mineralization
Oxidation
Oxidation process
PCB
polluted soils
Pollution
Pollution, environment geology
Polychlorinated biphenyls
Reaction time
remediation
Sandy soils
Soil and sediments pollution
Soil pollution
Soils
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Summary:This paper reports the results of the treatment of polychlorinatedbiphenyl (PCB) contaminated sandy soils (100 mg kg^sup -1^ Aroclor 1242) with the Fenton advanced oxidation process (AOP). The results obtained in the various assays permitted the optimization of conditions as follows: 5% H^sub 2^O^sub 2^; 100 ppm of Fe^sup 3+^; and a ratio of sandy soil mass/volume of oxidizing solution (m/V) of 1/3 g mL^sup -1^. In addition, these tests established the need for agitation and dispensed with the need for heat. The results obtained confirm that the oxidation process occurs in solid phase (on the PCBs adsorbed to soil particles), producing 98% elimination of the original PCB structure and 82% dechlorination, all within a reaction time of 72 hr. The degree of elimination was found to be dependent on the level of congener chlorination and the process displays a pseudo first order kinetics. In addition, the Fenton chemical oxidation process may be complemented by subsequent aerobic biological degradation which, after 15 days, produces 72% mineralization of the products generated during the chemical oxidation process.[PUBLICATION ABSTRACT]
ISSN:0049-6979
1573-2932
DOI:10.1023/B:WATE.0000022931.58418.90