Influence of bioaugmentation and biostimulation on PAH degradation in aged contaminated soils: Response and dynamics of the bacterial community

Haleyur, N, Shahsavari, E, Jain, S, Koshlaf, E, Daniel, V, Morrison, P, Osborn, A and Ball, A 2019, 'Influence of bioaugmentation and biostimulation on PAH degradation in aged contaminated soils: Response and dynamics of the bacterial community', Journal of Environmental Management, vol. 238, pp. 49-58.


Document type: Journal Article
Collection: Journal Articles

Title Influence of bioaugmentation and biostimulation on PAH degradation in aged contaminated soils: Response and dynamics of the bacterial community
Author(s) Haleyur, N
Shahsavari, E
Jain, S
Koshlaf, E
Daniel, V
Morrison, P
Osborn, A
Ball, A
Year 2019
Journal name Journal of Environmental Management
Volume number 238
Start page 49
End page 58
Total pages 10
Publisher Academic Press
Abstract Polycyclic aromatic hydrocarbons (PAHs) represent a group of hazardous compounds that are ubiquitous and persistent. The main aim of this study was to investigate the degradation of PAHs in chronically contaminated, aged and weathered soils obtained from a former gas plant of Australia. Biostimulation and bioaugmentation using individual isolates (Rhodococcus sp. (NH2), Achromobacter sp. (NH13), Oerskovia paurometabola (NH11), Pantoea sp. (NH15), Sejongia sp. (NH20), Microbacterium maritypicum (NH30) and Arthrobacter equi (NH21)) and a consortium of these isolates were tested during mesocosm studies. A significant reduction (99%) in PAH concentration was observed in all the treatments. In terms of the abundance of PAH-degrading genes and microbial community structure during PAH degradation, qPCR results revealed that Gram-positive bacteria were dominant over other bacterial communities in all the treatments. 16S sequencing results revealed that the inoculated organisms did not establish themselves during the treatment. However, substantial bacterial community changes during the treatments were observed, suggesting that the natural community exhibited sufficient resilience and diversity to enable an active, but changing degrading community at all stages of the degradation process. Consequently, biostimulation is proposed as the best strategy to remediate PAHs in aged, weathered and chronically contaminated soils.
Subject Environmental Management
Microbial Ecology
Keyword(s) Bioaugmentation
Biostimulation
Illumina sequencing
Metagenomics
Next generation sequencing
PAHs
DOI - identifier 10.1016/j.jenvman.2019.02.115
Copyright notice © 2019 Elsevier Ltd.
ISSN 0301-4797
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