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Leaching of metals from contamined soil with polyhydroxycarboxylic acids of natural origin
Örebro University, School of Science and Technology.
Örebro University, School of Science and Technology.
Örebro University, School of Science and Technology.ORCID iD: 0000-0002-2104-4593
(English)Manuscript (preprint) (Other academic)
National Category
Environmental Sciences
Research subject
Enviromental Science
Identifiers
URN: urn:nbn:se:oru:diva-15427OAI: oai:DiVA.org:oru-15427DiVA, id: diva2:413822
Available from: 2011-04-29 Created: 2011-04-29 Last updated: 2017-10-17Bibliographically approved
In thesis
1. Organic complexing agents for remediation of heavy metal contaminated soil
Open this publication in new window or tab >>Organic complexing agents for remediation of heavy metal contaminated soil
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Soil washing of heavy metal contaminated soil may be enhanced by the addition of synthetic chelators. Since many of these chelators may imply stress to soil organisms and are poorly biodegraded, identification and evaluation of effective biodegradable or recyclable chelators (synthetic and/or naturally produced) is of great interest. The efficiency of biodegradable synthetic chelators was evaluated both in bench- (0.3 kg) and meso- (10 kg) scale. Results demonstrated that the solubilization of copper, lead, and zinc was similar in bench- and meso-scale systems, which indicated that these systems could be used in a technical scale. However, the arsenic extraction in meso-scale system, were non-conclusive. Due to the high cost involved in the purchase of synthetic chelating agents, recycling of the solutions is of great interest, and this was achieved in five consecutive washing cycles. Considering the economy of a full-scale process, recycling of complexing solutions with sulfide addition at each cycle, both at the 100 mM-level, appears feasible. Naturally derived chelators were produced by saprotrophic fungi and through alkaline degradation of humic substances and cellulose. The results demonstrated that these types of complexing agents are not as effective as the synthetic chelators. In the fungal systems, desorption of metals was related to production of organic complexing acids, but mainly to the pH-decrease. Nonetheless, in some systems, formation of soluble complexes was indicated (copper). Enhancement of copper, lead, and zinc release with the use of alkaline leachates from wood and peat appeared possible. Since these agents have a natural origin and are derived from rather cheap raw material, recycling is not an issue.

 

Place, publisher, year, edition, pages
Örebro: Örebro universitet, 2009. p. 59
Series
Örebro Studies in Environmental Science, ISSN 1650-6278 ; 12
Keywords
soil washing, heavy metals, chelators, recycling
National Category
Natural Sciences Environmental Sciences
Research subject
Enviromental Science
Identifiers
urn:nbn:se:oru:diva-7913 (URN)978-91-7668-680-5 (ISBN)
Public defence
2009-10-02, HSP1, Fakultetsgatan 1, Örebro, 10:15 (English)
Opponent
Supervisors
Available from: 2009-09-11 Created: 2009-09-11 Last updated: 2017-10-18Bibliographically approved

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Arwidsson, ZandraAllard, Bert

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