Chemical Degradation of Polychlorinated Biphenyls by the UV-Fe2+/Fe3+-H2O2 System and its Application for Polychlorinated Biphenyl-polluted Electric Insulating Oil

Polychlorinated biphenyls (PCBs) are carcinogenic to humans and can be found in fuller's earth used for the treatment of used transformer oil. This work describes an optimization of the Fenton process for the removal of contaminants from fuller's earth. The effects of pH (2.5 and 4.0), [HO] (1.47 and 2.07 mol L), and [Fe] (1.7 and 40 mmol L) were studied. The Fenton process efficiency was monitored using the decreases in the chemical oxygen demand (COD) and the concentrations of oil and grease, total carbon (TC), PCBs, and HO. The fuller's earth contaminated with insulating oil presented 35% (w/w) of TC, 34% (w/w) of oil and grease, 297.0 g L COD, and 64 mg of PCBs per kg. The material could therefore be considered a dangerous waste. After Fenton treatment, using a slurry mode, there was a removal of 55% of COD, 20% of oil and grease, and 20% of TC, achieved at pH 2.5 using 2.07 mol L of HO and 40.0 mmol L of Fe. No PCBs were detected in the samples after the Fenton treatment, even using smaller amounts of Fenton reagents (1.47 mol L of HO, 1.7 mmol L of Fe, pH 2.5). The results indicated that the treated fuller's earth was free from PCB residues and could be disposed of in a simple landfill, in accordance with Brazilian PCB regulations.

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Chemical Degradation of Polychlorinated Biphenyls by the UV-Fe2+/Fe3+-H2O2 System and its Application for Polychlorinated Biphenyl-polluted Electric Insulating Oil

Abstract: The application of an optimized Fenton reaction and UV irradiation to the degradation of highly chlorinated biphenyls (PCBs) was performed.

Cited by 5 publications

References 34 publications

Dechlorination and decomposition of Aroclor 1242 in real waste transformer oil using a nucleophilic material with a modified domestic microwave oven

Dechlorination and decomposition of Aroclor 1242 in real waste transformer oil using a nucleophilic material with a modified domestic microwave oven

Chemidegradation of polychlorinated biphenyls from transformer oil wastewater

Application of Fenton process to remove organic matter and PCBs from waste (fuller’s earth) contaminated with insulating oil

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