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

被引:7
作者
Apolinario da Silva, Milady Renata [1 ]
Rodrigues, Eduardo de Oliveira [2 ]
Espanhol-Soares, Melina [1 ]
Silva, Flavio Soares [1 ]
Kondo, Marcia Matiko [1 ]
Gimenes, Rossano [1 ]
机构
[1] Itajuba Fed Univ UNIFEI, Phys & Chem Inst, Itajuba, MG, Brazil
[2] Sul de Minas Gerais Fed Inst Educ Sci & Technol I, Inconfidentes, MG, Brazil
关键词
Fuller's earth; Fenton reaction; insulating mineral oil; PCBs; factorial experimental design; ADVANCED OXIDATION PROCESSES; POLYCHLORINATED-BIPHENYLS; HERBICIDE TEBUTHIURON; WATER TREATMENT; DEGRADATION; SOILS; REMEDIATION; SYSTEM;
D O I
10.1080/09593330.2017.1420699
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 2.07molL(-1)), and [Fe2+] (1.7 and 40mmolL(-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, 297.0gL(-1) COD, and 64mg 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 2.07molL(-1) of H2O2 and 40.0mmolL(-1) of Fe2+. No PCBs were detected in the samples after the Fenton treatment, even using smaller amounts of Fenton reagents (1.47molL(-1) of H2O2, 1.7mmolL(-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.
引用
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页码:1298 / 1305
页数:8
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