Biodegradation of Petroleum Hydrocarbons in a Soil Polluted Sample by Oil-Based Drilling Cuttings

Microbial degradation of hydrocarbons in soils polluted by oil-based drilling mud and cuttings has been investigated by static methods such as composting or biopiling. Bioremediation of polluted soils by oil-based drilling cuttings through a slurry bioreactor has not previously been reported. The ma...

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Bibliographic Details
Published in:Soil & sediment contamination 2014-01, Vol.23 (5), p.586-597
Main Authors: Alavi, Nadali, Mesdaghinia, Ali-Reza, Naddafi, Kazem, Mohebali, Ghasemali, Daraei, Hiua, Maleki, Afshin, Alaei, Loghman
Format: Article
Language:English
Subjects:
Bacteria
Biodegradation
Biomass
Chips
Counting
Drilling
drilling cuttings
Environmental testing
Hydrocarbons
Microbiology
Microorganisms
petroleum hydrocarbons
Soil (material)
Soil contamination
Soil remediation
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Summary:Microbial degradation of hydrocarbons in soils polluted by oil-based drilling mud and cuttings has been investigated by static methods such as composting or biopiling. Bioremediation of polluted soils by oil-based drilling cuttings through a slurry bioreactor has not previously been reported. The main aim of this work is to monitor hydrocarbon biodegradation in slurry of drilling cuttings and unpolluted soils and the effects of nutrients on it. Indigenous, bacterial-mixed culture isolated from a polluted soil by drilling cuttings adapted to drilling mud concentrations up to 15% (v/v) was done during a 15-month program. The total petroleum hydrocarbons' (TPHs) removal efficiency in C/N/P 100/5/1 ratio was 90.5 and 79.85% under experimental and control conditions, respectively. The microbial count on the first day, 15 × 10 7 CFUg −1 , reached 20 × 10 9 CFUg −1 on the twenty-first day at experimental conditions. The TPH removal efficiency in C/N/P 100/10/2 was 92.5 and 82.25% at experiment and control, respectively. Increasing nitrogen and phosphorous amount couldn't increase microbial count in comparison with C/N/P ratio 100/5/1. The measured biomass contents and microbial counts in experiments were significantly higher than the control and confirmed hydrocarbons' biodegradation during the time. Results showed that slurry bioreactors could accelerate the biodegradation of TPHs and reduce remediation time in soil polluted by oil-based drilling cuttings.
ISSN:1532-0383
1549-7887
DOI:10.1080/15320383.2014.847900