Effect of sulphur species on the hydrocarbon biodegradation of oil sludge generated by a gas processing facility

Oily sludge from gas processing facilities contains components that are major environmental pollutants. Biodegradation is an alternative treatment, but can be affected by other components of the sludge, such as sulphur compounds, so it is important to evaluate the effect of these on oil biodegradati...

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Bibliographic Details
Published in:International journal of environmental science and technology (Tehran) 2013-05, Vol.10 (3), p.551-558
Main Authors: Reyes-Avila, J., Roldán-Carrillo, T., Castorena-Cortés, G., Zapata-Peñasco, I., Olguín-Lora, P.
Format: Article
Language:English
Subjects:
Aquatic Pollution
Biodegradation
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Science and Engineering
Hydrocarbons
Industrial wastes
Original Paper
Sludge
Soil Science & Conservation
Sulfur
Waste Water Technology
Water Management
Water Pollution Control
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Summary:Oily sludge from gas processing facilities contains components that are major environmental pollutants. Biodegradation is an alternative treatment, but can be affected by other components of the sludge, such as sulphur compounds, so it is important to evaluate the effect of these on oil biodegradation in order to prevent negative impacts. This work studied the transformation of sulphur compounds in oily sludge biodegradation systems at the microcosm level. The predominant sulphur compounds in the original sludge were elemental sulphur and pyrite (9,776 and 28,705.4 mg kg −1 , respectively). In the biodegradability assays, hydrocarbon concentrations decreased from 312,705.6 to 186, 760.3 mg kg −1 after 15 days of treatment. After this time, hydrocarbon degrading activity stopped, corresponding with a decrease in hydrocarbon degrading bacteria. These changes were related to a reduction in pH that inhibits biodegradation. During the assay, sulphur compounds were gradually oxidized and transformed. The concentration of sulphate increased from 5,096 to 64,868.3 mg kg −1 after 30 days in the assay, although controls were unchanged. Therefore, it is important to determine changes to the main compounds of the waste in order to assess their impact.
ISSN:1735-1472
1735-2630
DOI:10.1007/s13762-013-0183-6