KTH Chemical Engineering
نویسنده
چکیده
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.
منابع مشابه
Synthesis of Nanostructured Catalytic Materials from Microemulsions
1 Centro de Investigación en Materiales Avanzados, S. C. (CIMAV, Unidad Monterrey), GENES-Group of Embedded Nanomaterials for Energy Scavenging, Apodaca 66600, Mexico 2 KTH-Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemical Engineering and Technology, Stockholm 10044, Sweden; [email protected] * Correspondence: [email protected]; Tel.:...
متن کاملBoosting the efficiency and the stability of low cost perovskite solar cells by using CuPc nanorods as hole transport material and carbon as counter electrode
Institute of Artificial Photosynthesis, State Key Laboratory of Fine Chemicals, DUT–KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology (DUT), 2 Linggong Road, 116024 Dalian, China School of Chemical Science and Engineering, Centre of Molecular Devices, Department of Chemistry, KTH Royal Institute of Technology, Teknikringen 30, 10044 Stockholm, Sweden ...
متن کاملLeast costly closed-loop performance diagnosis and plant re-identification
Least costly closed-loop performance diagnosis and plant re-identification A. Mesbaha,∗, X. Bomboisb, M. Forgioneb, H. Hjalmarssonc and P.M.J. Van den Hofd Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, USA; Laboratoire Ampère UMR CNRS, Ecole Centrale de Lyon, Ecully Cedex, France; The Automatic Control Laboratory, ACCESS Linnaeus Center, School of ...
متن کاملWater in cellulose: evidence and identification of immobile and mobile adsorbed phases by H MAS NMR
b. Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden c. Innventia AB, Box 5604, SE-114 86 Stockholm, Sweden † These authors contributed equally. ‡ Present address: Magne c Resonance Research Centre, Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0HE, UK * Corresponding author: [email protected]. 1 Water in c...
متن کاملThe Kth-best approach for linear bilevel multifollower programming with partial shared variables among followers
#Electrical, Electronic & Computer Engineering The University of Southern Queensland Toowoomba, Queensland 4350, Australia [email protected] Abstract In a real world bilevel decision-making, the lower level of a bilevel decision usually involves multiple decision units. This paper proposes the Kth-best approach for linear bilevel multifollower programming problems with shared variables among fol...
متن کامل