Insights on the criteria of selection of vegetable and mineral dielectric fluids used in power transformers on the basis of their biodegradability and toxicity assessments.

Autor: Módenes AN; Department of Chemical Engineering Postgraduate Program, State University of West Paraná, UNIOESTE, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil. Electronic address: anmodenes@yahoo.com.br., Sanderson K; Department of Chemical Engineering Postgraduate Program, State University of West Paraná, UNIOESTE, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil., Trigueros DEG; Department of Chemical Engineering Postgraduate Program, State University of West Paraná, UNIOESTE, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil., Schuelter AR; Department of Chemical Engineering Postgraduate Program, State University of West Paraná, UNIOESTE, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil., Espinoza-Quiñones FR; Department of Chemical Engineering Postgraduate Program, State University of West Paraná, UNIOESTE, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil., Neves CV; Department of Chemical Engineering Postgraduate Program, State University of West Paraná, UNIOESTE, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil., Zanão Junior LA; Department of Energy Engineering in Agriculture Postgraduate Program, West Paraná State University, Rua Universitária 2069, Jd. Universitário, 85819-110, Cascavel, PR, Brazil., Kroumov AD; The 'Stephan Angeloff' Institute of Microbiology-Bulgarian Academy of Sciences, Acad. G. Bonchev str., Bl. 26, Sofia 1113, Bulgaria.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2018 May; Vol. 199, pp. 312-319. Date of Electronic Publication: 2018 Feb 07.
DOI: 10.1016/j.chemosphere.2018.02.033
Abstrakt: Leakage of transformer dielectric fluids is a concern because it may pose a risk of environmental contamination. In this study, the deleterious effects of vegetable and mineral dielectric fluids in water bodies were investigated using biodegradability and acute toxicity tests with Danio rerio and Artemia salina. Regarding biodegradability, all four tested vegetable oils (soy, canola, sunflower and crambe) were considered as easily biodegradable, presenting degradation rates significantly higher than the Lubrax-type mineral fluid. Acute toxicity tests were performed in two separate experiments without solution renewal. In the first experiment, the organisms were exposed in direct contact to different concentrations of vegetable (soy) and mineral (Lubrax) oils. Total soy-type vegetable oil has a higher toxic effect than Lubrax-type mineral oil. In the second experiment, the organisms were exposed to increasing percentages of the water-soluble fraction (WSF) of both types of tested oils. The LC 50 values for the water-soluble fraction of the Lubrax-type mineral oil were about 5 and 8% for the Danio rerio and Artemia salina bioindicators, respectively, whereas the vegetable oil did not present toxic effect, regardless of its WSF. These results have shown that a strict selection of dielectric fluids and monitoring the leakage from power transformers is a serious duty of environmental protection agencies.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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