Analytical evaluation of a chemical biological treatment of diesel contaminated drill cuttings
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Abstract
The use of drilling fluids with diesel-based muds in Cuban oil drilling is one of the main causes that drives continuous research for the final treatment of waste impregnated with said muds. The combination of a chemical-biological process allowed the reduction of the content of fats and oils (G and A) and total hydrocarbons (HCT), indicator parameters of oil pollution. In the applied technology, analytical monitoring of physical-chemical parameters is carried out; chemical and microbiological, in compliance with regulatory standards. The objective of this work was to carry out chemical and microbiological tests, complemented by high resolution techniques, for a better understanding of the reduction and/or elimination of the contaminant achieved by the process. The microbiological assay allowed ten (10) strains of pure bacteria to be obtained from the microbial cultures isolated from the process. Five (5) strains showed growth in hydrocarbon compounds (hexadecane, naphthalene and fluorene) and two of them in diesel. The degradation of diesel by a strain is confirmed through experimentation and quantification carried out by gas chromatography coupled to a mass spectrometer (GC-MS). A decrease in the intensity of the maximum valuesassociated with n-paraffins is observed with an increase in the mixture of unresolved compounds (UCM) of the chemical test carried out, from the reduction of the C17 and C18 paraffinic chains with respect to isoprenoid compounds pristane and phytane respectively. The decrease that occurred in the dimethyl-phenanthrene compounds with respect to the trimethyl-phenanthrenes and the non-presence of mono-phenanthrenes in the analyzed sample corresponding to the end of the process, corroborates the degradation efficiency achieved in the applied treatment.
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