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Centro Azúcar
versión On-line ISSN 2223-4861
Resumen
ROMERO SILVA, Roberto et al. ECO-TOXICOLOGICAL EVALUATION OF DIESEL CONTAMINATED RESIDUES HANDLING. cen. az. [online]. 2020, vol.47, n.4, pp. 45-56. Epub 01-Oct-2020. ISSN 2223-4861.
Introduction:
Eco-toxicological tests performance is among current legislation requirements for biodegradation processes of pollutants improvement.
Objective:
To apply acute toxicity bioassays for treated soils contaminated with diesel eco-toxicological evaluation.
Materials and methods:
Organization for Economic Cooperation and Development (OECD)guide 207 Procedures were applied in which lettuce (Latuca Sativa) seeds and earthworm (Ensenia Andrei) are used as bioindicators; at test concentrations (1, 5, 25, 50 and 100%). matrices toxic effect was measured calculating mean lethal concentration (LC50).
Results and Discussion:
Toxicity is obtained in soils treated by bioremediation with microorganism’s addition (bio augmentation) 1 and 2 in the experimentation carried out with lettuce seeds. Soils treated by bioremediation with an increase in organic conditioners (improved) 1 and 2 and chemical - biological stabilization for four execution variants are not toxic. Evaluation carried out with earthworms showed toxicity in soils treated by improved bioremediation and chemical-biological stabilization with agromena. A similar result was obtained with the soil treated by bio augmentation 2. Non-toxicity of the soils treated by chemical-biological stabilization with an improved product and bio augmentation 1 was demonstrated.
Conclusions:
The toxic nature of the soils treated by bio augmentation No. 1 and 2, improved bioremediation No. 1 and 2 and chemical-biological stabilization No. 2 and 4, constitute a risk for ecosystem.
Palabras clave : bioremediation; contamination; mortality; toxicity.