Assessing impediments to hydrocarbon biodegradation in weathered contaminated soils

Adetutu, E, Weber, J, Aleer, S, Dandie, C, Arbuto, A, Ball, A and Juhasz, A 2013, 'Assessing impediments to hydrocarbon biodegradation in weathered contaminated soils', Journal of Hazardous Materials, vol. 261, pp. 847-853.


Document type: Journal Article
Collection: Journal Articles

Title Assessing impediments to hydrocarbon biodegradation in weathered contaminated soils
Author(s) Adetutu, E
Weber, J
Aleer, S
Dandie, C
Arbuto, A
Ball, A
Juhasz, A
Year 2013
Journal name Journal of Hazardous Materials
Volume number 261
Start page 847
End page 853
Total pages 7
Publisher Elsevier BV
Abstract In this study, impediments to hydrocarbon biodegradation in contaminated soils were assessed using chemical and molecular methodologies. Two long-term hydrocarbon contaminated soils were utilised which were similar in physico-chemical properties but differed in the extent of hydrocarbon (C10-C40) contamination (S1: 16.5 g kg-1; S2: 68.9 g kg-1). Under enhanced natural attenuation (ENA) conditions, hydrocarbon biodegradation was observed in S1 microcosms (26.4% reduction in C10-C40 hydrocarbons), however, ENA was unable to stimulate degradation in S2. Although eubacterial communities (PCR-DGGE analysis) were similar for both soils, the alkB bacterial community was less diverse in S2 presumably due to impacts associated with elevated hydrocarbons. When hydrocarbon bioaccessibility was assessed using HP-ß-CD extraction, large residual concentrations remained in the soil following the extraction procedure. However, when linear regression models were used to predict the endpoints of hydrocarbon degradation, there was no significant difference (P > 0.05) between HP-ß-CD predicted and microcosm measured biodegradation endpoints. This data suggested that the lack of hydrocarbon degradation in S2 resulted primarily from limited hydrocarbon bioavailability.
Subject Bioremediation
Keyword(s) AlkB
bioavailability
biodegradation
bioremediation
hydrocarbons
DOI - identifier 10.1016/j.jhazmat.2013.01.052
Copyright notice © 2013 Elsevier
ISSN 0304-3894
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