Phytoremediation of light non-aqueous phase liquids

Oniosun, Sunday, Harbottle, Michael ORCID: https://orcid.org/0000-0002-6443-5340, Tripathy, Snehasis ORCID: https://orcid.org/0000-0003-1632-7668 and Cleall, Peter ORCID: https://orcid.org/0000-0002-4005-5319 2018. Phytoremediation of light non-aqueous phase liquids. Presented at: The International Congress on Environmental Geotechnics, Hangzhou, China, 38 Oct - 1 Nov 2018. Proceedings of the 8th International Congress on Environmental Geotechnics. , vol.1 Singapore: Springer, pp. 788-795. 10.1007/978-981-13-2221-1_89

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Abstract

Non-aqueous phase liquids (NAPLs) are persistent sources of contamination in the ground, providing a long-term supply of dissolved phase contamination and taking significant periods to dissipate naturally. Light NAPLs (LNAPLs) take the form of a separate phase within the ground, often as individual ganglia in pore spaces within the capillary zone such that the contaminated region is diffuse and comprised of many unconnected small contaminant sources. Consequently, remedial action is challenging and success may be limited to ex-situ remediation techniques. The ability of plants to phytoremediate dissolved-phase contamination is well known, but the impact of LNAPLs on plant growth and subsequent contaminant behaviour is largely unknown. Experimental work with ryegrass (Lolium perenne) is presented, exploring the impact of the physical presence of an LNAPL (mineral oil) on plant growth, root distribution and oil removal. The presence of the oil was found to significantly impact root biomass and distribution, leading to zones of increased root growth alongside decreased shoot growth. Significant removal of the LNAPL was noted in both hydroponic conditions and planted soil.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	Springer
ISBN:	9789811322204
Date of First Compliant Deposit:	5 November 2018
Date of Acceptance:	11 August 2018
Last Modified:	23 Nov 2024 22:00
URI:	https://orca.cardiff.ac.uk/id/eprint/116467

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