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Effect of Medicago sativa L. and compost on organic and inorganic pollutant removal from a mixed contaminated soil and risk assessment using ecotoxicological tests
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Université de Montréal, Canada.ORCID iD: 0000-0001-6288-4022
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0002-1903-760X
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0001-8906-9271
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2016 (English)In: International journal of phytoremediation, ISSN 1522-6514, E-ISSN 1549-7879, Vol. 18, no 11, 1136-1147 p.Article in journal (Refereed) Published
Abstract [en]

Several Gentle Remediation Options (GRO), e.g. plant-based options (phytoremediation), singly and combined with soil amendments, can be simultaneously efficient for degrading organic pollutants and either stabilizing or extracting trace elements (TE). Here, a 5-month greenhouse trial was performed to test the efficiency of Medicago sativa L., singly and combined with a compost addition (30% w/w), to treat soils contaminated by petroleum hydrocarbons (PHC), Co and Pb collected at an auto scrap yard. After five months, total soil Pb significantly decreased in the compost-amended soil planted with M. sativa, but not total soil Co. Compost incorporation into the soil promoted PHC degradation, M. sativa growth and survival, and shoot Pb concentrations (3.8 mg/kg DW). Residual risk assessment after the phytoremediation trial showed a positive effect of compost amendment on plant growth and earthworm development. The O2 uptake by soil microorganisms was lower in the compost-amended soil, suggesting a decrease in microbial activity. This study underlined the benefits of the phytoremediation option based on M. sativa cultivation and compost amendment for remediating PHC and Pb contaminated soils.

Place, publisher, year, edition, pages
2016. Vol. 18, no 11, 1136-1147 p.
Keyword [en]
Cobalt, Petroleum Hydrocarbon, Phytoremediation, Polycyclic Aromatic Hydrocarbon, Lead
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-52380DOI: 10.1080/15226514.2016.1186594ISI: 000381015200010PubMedID: 27216854OAI: oai:DiVA.org:lnu-52380DiVA: diva2:926166
Available from: 2016-05-04 Created: 2016-05-04 Last updated: 2017-02-22Bibliographically approved
In thesis
1. Phytoremediation of soil contaminated with petroleum hydrocarbons and trace elements
Open this publication in new window or tab >>Phytoremediation of soil contaminated with petroleum hydrocarbons and trace elements
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The rapid urbanization and industrialization has led to an increase of disposal petroleum hydrocarbons (PHC) and trace elements (TE) into the environment. These pollutants are considered as the most toxic contaminants in the world due to their persistence in the environment, and the long range of toxicological effects for living beings.

Recent concerns regarding the environmental contamination have initiated the development of several remediation technologies, including physical, chemical, and biological approaches. In this thesis, gentle soil remediation options (GRO) were investigated at different scales for the reclamation of PHC and TE co-contaminated soil. In the first part of this thesis, laboratory experiments were performed to characterize PHC and TE contaminated soil as well as the indigenous microorganisms (bacteria and fungi) present inside these contaminated soil. It was found that the studied aged contaminated soil had a negative effect on earthworm’s development and L. sativum biomass. Moreover, a high respiration of microorganisms attributed to the transformation/ mineralization of organic matter or/and organic pollutants was observed. This presence of viable microorganisms suggested an adaptation of microorganisms to the contaminant. Further results showed that the long-term exposure of soil microorganisms to high PHC concentration and the type of isolation culture media did not influence the ability of isolates to effectively degrade PHC. However, phylogenic affiliation had a strong on PHC biodegradation. In the second part of this thesis, preliminary studies in greenhouse were assessed to investigate the ability of M. sativa assisted by compost in the greenhouse aided-phytoremediation of PHC and TE. It was found that compost incorporation into the soil promoted PHC degradation, M. sativa growth and survival, and phytoextraction of TE. Residual risk assessment after the phytoremediation trial also showed a positive effect of compost amendment on plant growth and earthworm development. Pilot scale ecopile experiment carried out in the third part of this thesis allow a reduction of up to 80% of PHC and 20% of metals after 17 months. This research demonstrated that M. sativa and H. annus were suitable for phytodegradation of PHC and phytoextraction of TE.  Results from this thesis are helpful for further full-scale phytoremediation studies. 

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2017. 212 p.
Series
Linnaeus University Dissertations, 279/2017
Keyword
Petroleum Hydrocarbon, Trace Elements, Gentle Soil Remediation Options, Polycyclic Aromatic Hydrocarbon, Respirometry, Ecopile, Bacteria, Fungi
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-60839 (URN)978-91-88357-63-2 (ISBN)
Public defence
2017-03-10, N2007, Västergård, Kalmar, 14:30 (English)
Opponent
Supervisors
Available from: 2017-02-22 Created: 2017-02-22 Last updated: 2017-03-16Bibliographically approved

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Marchand, CharlotteHogland, WilliamKaczala, FabioJani, YahyaAugustsson, Anna
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