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Introduction: In drilling oil wells process, water or oil-based muds are used. During these activities drag rock fragments detached by drilling bit action, called drilling cuts, towards the surface. These cuts inadequate handling generates an environmental contamination problem. Objective: To evaluate a chemical-biological stabilization process as drilling cuts contaminated with diesel fuel mud treatment, in microcosm, in a 90 days period. Materials and methods: Chemical stabilization stage was carried out by adding calcium oxide (CaO), biological one is a bioremediation process, through soil cultivation technique and a bio stimulation method. In biological stage, two experimental variants were evaluated as sources of nutrients, a soil improver product (V1) and Agromena (V2). For applied treatment evaluation, fats and oils (G and A) biodegradation rates (TB) and total hydrocarbons (HCT) were determined. Results and Discussion: 56% and 44% TB were obtained for 1 and 2 variants, respectively, in terms of G and A; while reached was 72% and 43% for HCT the TB, respectively. Conclusions: Achieved results showed that proposed treatment application is feasible for these residues safe management, reaching the highest degradation levels with soil improver product. [ABSTRACT FROM AUTHOR]

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 ecotoxicological 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. [ABSTRACT FROM AUTHOR]

Introduction: Chemical substances are widely used in different production processes and applications of modern life; therefore, their use has become widespread. A significant number of them are considered dangerous due to properties or characteristics that can affect the environment and living beings. Disused and expired chemical products (PQOC) accumulation in the oil industry is a problem that dates back several years, so it is necessary to define and apply management options that allow the risks associated with these substances reduction. Objective: To reduce PQOC inventories in the oil industry, through the application of management alternatives. Materials and Methods: The analysis of the PQOC stocks was carried out, taking into account the principles of hierarchy in waste management, which is proposed, after minimizing their generation, use and recovery. Each substance was evaluated for treatment or final disposal solutions application, considering type, quantity, danger, particular characteristics and technical conditions available for run them, in addition to applicable legal requirements. Results and Discussion: Different management options were defined and applied, such as: stabilization of the site, other uses, transfer to other users, energy use, as well as dilution and neutralization. Conclusions: These substances inventories were reduced by 736.2 kg and 201.3 L. Economic and environmental analysis show the feasibility of applying these alternatives, also reducing the risks generated by their prolonged storage. [ABSTRACT FROM AUTHOR]

The coal tar residue is formed by the accumulated sediments of the preparation of the Picis Carbonis liquor, an ingredient of the Brea Shampoo pharmaceutical product. This waste was accumulated for years without a final management option being applied for it. The objective of this work was to propose alternatives for the final disposal of coal tar residue. The physicalchemical and microbiological characterization was carried out, using established methods and from the obtained results were analyzed as possible alternatives of disposition: the bioremediation, the incorporation in asphaltic cements and the mixture to heavy fuels (national crude oil and fuel oil). The results showed that it is feasible to dose and mix the waste with heavy fuels, being the best variant the mixture with national crude in the proportions 1, 3, 5 and 10%. It was proposed to apply this variant in existing facilities, which is environmentally acceptable taking into account the concentration values of metals present in it. On the other hand, it was shown that the other two alternatives evaluated were not viable. The measures to be complied were recommended for the storage, transportation and safe disposal of this dangerous waste that includes its energy use. The technical and environmental feasibility of this residual mixed with fuel was manifested, as well as the importance of the safe disposal of a hazardous waste and the need to comply with its proper handling. [ABSTRACT FROM AUTHOR]