Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 149, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2020.104922
Keywords
Bioaccessibility; PAHs; Remediation; Soil; Composting; Hydroxypropl-beta-cyclodextrin
Funding
- Australian Postgraduate Award (APA) scholarship (Australian Federal Government)
- University of New England
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Co-composting for the remediation treatment of aged polycyclic aromatic hydrocarbons (PAHs) in field contaminated soil was examined in this study. Two PAH contaminated soils collected from a manufacturing gas plant site with high PAH concentrations (184.00 +/- 3.99 mg kg(-1) and 490.0 +/- 43.53 mg kg(-1)) were co-composted with cattle manure and wheat straw for up to 56 days in laboratory microcosms. A range of optimised co-composting treatments including addition of Triton-X100 surfactant and a biological surfactant from the Australian Red Ash tree (Aiphitonia excelsa) were tested. There was no significant decrease in the PAH concentrations in any of the different co-composting treatments for either of the soils, despite an 87% decrease in a phenanthrene spike (100 mg kg(-1)), and evidence of PAH microbial catabolic activity. Non-exhaustive extraction using hydroxypropl-5-cyclodextrin (HP-5-CD) and linear regression modelling confirmed that PAH bioaccessibility constrained PAH co-composting remediation in these soils. The results demonstrate that co-composting alone is not an effective remediation strategy for certain aged PAH contaminated soils. For these soils some form of pre-composting chemical or engineering treatment is required to overcome bioaccessibility limitations in successful remediation.
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