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Accumulation of heavy metals in Oostriku peat bog, Estonia: site description, conceptual modelling and geochemical modelling of the source of the metals
KTH, Superseded Departments, Chemical Engineering and Technology.
KTH, Superseded Departments, Chemical Engineering and Technology.
KTH, Superseded Departments, Chemical Engineering and Technology.
2004 (English)In: Environmental Geology, ISSN 0943-0105, E-ISSN 1432-0495, Vol. 45, 731-742 p.Article in journal (Refereed) Published
Abstract [en]

Oxidation of sulphides leads to the dissolution of metals, which are transported with water and accumulate at geochemical barriers. Such barriers can form in peat bogs. This paper gives an introduction into the long-term processes in Oostriku peat bog where high accumulations of heavy metals are observed. Peat and water samples are analysed for Fe, As and heavy metals (Cd, Cu, Mn, Ni, Pb and Zn) using different methods. A concept is based on the observations. Metals are leached by sulphide oxidation in the carbonate rocks upstream of the peat. The water feeds the peat from below. The metals are sorbed and precipitated in the peat. The sulphide oxidation is simulated to examine the origin and metal speciation in the water. The simulated solution is compared with the groundwater entering the peat. The results showed a fair agreement for the major constituents. There were considerable differences for species with low concentrations.

Place, publisher, year, edition, pages
2004. Vol. 45, 731-742 p.
Keyword [en]
peat bog, heavy metals, sulphide oxidation, model
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-7877DOI: 10.1007/s00254-003-0931-xISI: 000220519700014Scopus ID: 2-s2.0-1642367508OAI: oai:DiVA.org:kth-7877DiVA: diva2:13035
Note
QC 20101001Available from: 2005-10-21 Created: 2005-10-21 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Long-term metal retention processes in a peat bog: Field studies, data and modelling
Open this publication in new window or tab >>Long-term metal retention processes in a peat bog: Field studies, data and modelling
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The study was inspired by the need to assess long-term metal retention in municipal solid waste (MSW) landfills. The long-term processes in landfills are poorly known due to the relatively short time that such landfills have been in existence. Natural analogues where similar metal binding processes could be expected were therefore sought for.

The work described in this thesis aims to elucidate the long-term transport and attenuation processes involved in the retention of heavy metals in a peat bog, through field studies and modelling. The Oostriku peat bog (central Estonia) has been exposed to metal-rich groundwater discharge over a long period of time and was found to have accumulated high concentrations of Fe, other heavy metals (e.g. Pb, Cu, Zn, Mn), and As. It was characterised in detail with respect to metal depth distribution and main metal binding mechanisms (using an optimised Tessier extraction scheme).

The oxidation of metal sulphides in the surrounding carbonate bedrock was proposed to be a possible long-term source of heavy metals in the water emerging in a spring at the peat site. The water in the spring and peat pore-water was sampled and analysed. The dissolution sequence of the sulphide minerals and evolution of the water composition along a flowpath in the carbonate rock were modelled. Resulting aqueous phase concentration of major and minor elements are discussed in relation to governing geochemical processes. The simulated water composition was compared with that observed.

Retention of metals transported with water through the peat was assessed through modelling equilibrium sorption on solid organic matter and amorphous ferric oxyhydroxide by using a simplified quantitative modelling approach and independently obtained data. Dynamic evolution of metal sorption fronts along a peat profile over time was modelled to test metal-metal competition effects. A possible formation of ferric oxyhydroxide in the peat bog was also assessed with the model.

Place, publisher, year, edition, pages
Stockholm,: KTH, 2005. vi, 80 p.
Series
Trita-KET, ISSN 1104-3466 ; 219
Keyword
Peat, heavy metals distribution, sequential extraction, binding mechanisms, modelling, metal sulphide oxidation, aqueous composition, sorption, humic substances, ferric oxyhydroxide
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-460 (URN)91-7178-164-1 (ISBN)
Public defence
2005-11-03, D3, Lindstedtsväg 5, EntrePlan, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101001Available from: 2005-10-21 Created: 2005-10-21 Last updated: 2010-10-01Bibliographically approved

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