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

Abstract:

: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), [H2O2] (1.47 and 2.07 mol L-1), and [Fe2+] (1.7 and 40 mmol L-1) 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 H2O2. 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-1 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-1 of H2O2 and 40.0 mmol L-1 of Fe2+. No PCBs were detected in the samples after the Fenton treatment, even using smaller amounts of Fenton reagents (1.47 mol L-1 of H2O2, 1.7 mmol L-1 of Fe2+, 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.

journal_name

Environ Technol

journal_title

Environmental technology

authors

da Silva MRA,Rodrigues EO,Espanhol-Soares M,Silva FS,Kondo MM,Gimenes R

doi

10.1080/09593330.2017.1420699

subject

Has Abstract

pub_date

2019-04-01 00:00:00

pages

1298-1305

issue

10

eissn

0959-3330

issn

1479-487X

journal_volume

40

pub_type

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