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Pilot scale aided-phytoremediation of a co-contaminated soil
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Univ Montreal, Canada.ORCID iD: 0000-0001-6288-4022
Univ Bordeaux, France.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0001-8906-9271
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
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2018 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 618, p. 753-764Article in journal (Refereed) Published
Abstract [en]

A pilot scale experiment was conducted to investigate the aided-phytoextraction of metals and the aided-phytodegradation of petroleum hydrocarbons (PHC) in a co-contaminated soil. First, this soil was amended with compost (10% w/w) and assembled into piles (Unp-10%C). Then, a phyto-cap of Medicago sativa L. either in monoculture (MS-10%C) or co-cropped with Helianthus annuus L. as companion planting (MSHA-10%C) was sown on the topsoil. Physico-chemical parameters and contaminants in the soil and its leachates were measured at the beginning and the end of the first growth season (after five months). In parallel, residual soil ecotoxicity was assessed using the plant species Lepidium sativum L. and the earthworm Eisenia fetida Savigny, 1826, while the leachate ecotoxicity was assessed using Lemna minor L. After 5 months, PH C10-C40, PAH-L, PAH-M PAH-H, Pb and Cu concentrations in the MS-10%C soil were significantly reduced as compared to the Unp-10% C soil. Metal uptake by alfalfa was low but their translocation to shoots was high for Mn, Cr, Co and Zn (transfer factor (TF) >1), except for Cu and Pb. Alfalfa in monoculture reduced electrical conductivity, total organic C and Cu concentration in the leachate while pH and dissolved oxygen increased. Alfalfa co-planting with sunflower did not affect the extraction of inorganic contaminants from the soil, the PAH (M and H) degradation and was less efficient for PH C10-C40 and PAH-L as compared to alfalfa monoculture. The co-planting reduced shoot and root Pb concentrations. The residual soil ecotoxicity after 5 months showed a positive effect of co-planting on L. sativum shoot dry weight (DW) yield. However, high contaminant concentrations in soil and leachate still inhibited the L. sativum root DW yield, earthworm development, and L. minor growth rate. (C) 2017 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 618, p. 753-764
Keywords [en]
Phytotechnologies, Helianthus annuus, Lepidium sativum, Toxicity test, Compost
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-71547DOI: 10.1016/j.scitotenv.2017.08.143ISI: 000424130500078PubMedID: 29054647OAI: oai:DiVA.org:lnu-71547DiVA, id: diva2:1191007
Available from: 2018-03-16 Created: 2018-03-16 Last updated: 2018-03-16Bibliographically approved

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Marchand, CharlotteJani, YahyaKaczala, FabioNotini, PeterHogland, William

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