Leech, Calvin

Tighe, Matthew K

Pereg, Lily

Winter, Gal

McMillan, Mary

Esmaeili, Atefeh

Wilson, Susan C

2020-04

Supplementary data to this article can be found online at https://doi.org/10.1016/j.ibiod.2020.104922

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 (Alphitonia 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-β-cyclodextrin (HP-β-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.

International Biodeterioration and Biodegradation, v.149, p. 1-12

1879-0208

0964-8305

https://hdl.handle.net/1959.11/28870

en

Elsevier Ltd

Bioaccessibility constrains the co-composting bioremediation of field aged PAH contaminated soils

Journal Article

Publication