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Ash – the raw material base for the future
Marko, Michal ; Ptáček, Petr (referee) ; Opravil, Tomáš (advisor)
This master’s thesis responds to the worldwide problem concerning in the search of new material base for the future usage. Solid residues from high temperature or fluid coal combustion could be one of many alternatives to the raw materials. The study deals with the analysis of side energy products produced by power plant industry in the Czech Republic. Based on the fly ash chemical composition, possibilities of aluminium and even iron and titanium separation were proposed and then proved in the laboratory scale. Extracted components were separated selectively using apropriate methods. Then a couple of sintering reactions leading to improvement the leachability of selected elements from the fly ash matrix were carried out. Appropriate input material modification by high-temperature sintering reaction combined with extraction process in the sulfuric acid solution leads in dissolution up to 99 % of aluminium from the fluid and high-temperature fly ash.
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Impact of soil samples treatment and used measurement methods on heavy metals concentrations.
Kejík, Marek ; Marko, Michal (referee) ; Hajzler, Jan (advisor)
This bachelor thesis aims to explore the possibilities of treatment of soil samples and compare the suitability of selected analytical methods of analysis for determining the concentration of heavy metals. 7 reference certified materials of various soil types and one soil sample from the recreational area located in Brno were selected. Each soil sample was subjected to three different treatments. It is a method of melting into a solution, decomposition in aqua regia and aqueous extract. All thus treated samples were subsequently subjected to analytical methods for determining the concentration, specifically the ICP-OES and GF-AAS methods were used. To assess the suitability of selected methods of treatment of soil samples and analytical methods of determination, the 4 most risky elements were selected, namely arsenic, cadmium, copper and lead. The measured concentrations were compared with reference values of soil samples. Finally, the suitability of combinations of different sample preparation procedures and selected methods of analytical determination of the content of determined elements from soil samples was assessed.
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Side products from power industry as the raw material base for the future
Marko, Michal ; Kalina, Lukáš (referee) ; Opravil, Tomáš (advisor)
This work reacts to the worldwide problem related to looking for alternative sources of raw materials. The work deals with analyzing samples of high temperature and fluid fly ashes produced by power plants in the Czech Republic, followed by experimental verification of possibilities to separate some desired components. Based on the elemental and phase compositions, the possibility of aluminum, titanium, and iron extraction to sulfuric acid solution and subsequent selective precipitation using suitable separeation methods was designed and tested in a laboratory scale. Separation of selected elements from the fly ash matrix was carried out at room temperature and then at the boiling point of the used solvent.
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Clustering of dynamic data
Marko, Michal ; Mráz, František (advisor) ; Skopal, Tomáš (referee)
Title: Cluster analysis of dynamic data Author: Bc. Michal Marko Department: Department of Software and Computer Science Education Supervisor: RNDr. František Mráz, CSc. Supervisor's e-mail address: Frantisek.Mraz@mff.cuni.cz Abstract: The mail goal of this thesis is to choose or eventually to propose own modifications to some of the cluster analysis methods in order to observe the progress of dynamic data and its clusters. The chosen ones are applied to the real data. The dynamic data denotes series of information that is created periodically over the time describing the same characteristics of the given set of data objects. When applied to such data, the problem of classic clustering algorithm is the lack of coherence between the results of particular data set from the series which can be illustrated via application to our artificial data. We discuss the idea of proposed modifications and compare the progress of the methods based on them. In order to be able to use our modified methods on the real data, we examine their applicability to the multidimensional artificial data. Due to the complications caused by multidimensional space we develop our own validation criterion. Once the methods are approved for use in such space, we apply our modified methods on the real data, followed by the visualization and...
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Impact of soil samples treatment and used measurement methods on heavy metals concentrations.
Kejík, Marek ; Marko, Michal (referee) ; Hajzler, Jan (advisor)
This bachelor thesis aims to explore the possibilities of treatment of soil samples and compare the suitability of selected analytical methods of analysis for determining the concentration of heavy metals. 7 reference certified materials of various soil types and one soil sample from the recreational area located in Brno were selected. Each soil sample was subjected to three different treatments. It is a method of melting into a solution, decomposition in aqua regia and aqueous extract. All thus treated samples were subsequently subjected to analytical methods for determining the concentration, specifically the ICP-OES and GF-AAS methods were used. To assess the suitability of selected methods of treatment of soil samples and analytical methods of determination, the 4 most risky elements were selected, namely arsenic, cadmium, copper and lead. The measured concentrations were compared with reference values of soil samples. Finally, the suitability of combinations of different sample preparation procedures and selected methods of analytical determination of the content of determined elements from soil samples was assessed.
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|
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Ash – the raw material base for the future
Marko, Michal ; Ptáček, Petr (referee) ; Opravil, Tomáš (advisor)
This master’s thesis responds to the worldwide problem concerning in the search of new material base for the future usage. Solid residues from high temperature or fluid coal combustion could be one of many alternatives to the raw materials. The study deals with the analysis of side energy products produced by power plant industry in the Czech Republic. Based on the fly ash chemical composition, possibilities of aluminium and even iron and titanium separation were proposed and then proved in the laboratory scale. Extracted components were separated selectively using apropriate methods. Then a couple of sintering reactions leading to improvement the leachability of selected elements from the fly ash matrix were carried out. Appropriate input material modification by high-temperature sintering reaction combined with extraction process in the sulfuric acid solution leads in dissolution up to 99 % of aluminium from the fluid and high-temperature fly ash.
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|
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Clustering of dynamic data
Marko, Michal ; Mráz, František (advisor) ; Skopal, Tomáš (referee)
Title: Cluster analysis of dynamic data Author: Bc. Michal Marko Department: Department of Software and Computer Science Education Supervisor: RNDr. František Mráz, CSc. Supervisor's e-mail address: Frantisek.Mraz@mff.cuni.cz Abstract: The mail goal of this thesis is to choose or eventually to propose own modifications to some of the cluster analysis methods in order to observe the progress of dynamic data and its clusters. The chosen ones are applied to the real data. The dynamic data denotes series of information that is created periodically over the time describing the same characteristics of the given set of data objects. When applied to such data, the problem of classic clustering algorithm is the lack of coherence between the results of particular data set from the series which can be illustrated via application to our artificial data. We discuss the idea of proposed modifications and compare the progress of the methods based on them. In order to be able to use our modified methods on the real data, we examine their applicability to the multidimensional artificial data. Due to the complications caused by multidimensional space we develop our own validation criterion. Once the methods are approved for use in such space, we apply our modified methods on the real data, followed by the visualization and...
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Side products from power industry as the raw material base for the future
Marko, Michal ; Kalina, Lukáš (referee) ; Opravil, Tomáš (advisor)
This work reacts to the worldwide problem related to looking for alternative sources of raw materials. The work deals with analyzing samples of high temperature and fluid fly ashes produced by power plants in the Czech Republic, followed by experimental verification of possibilities to separate some desired components. Based on the elemental and phase compositions, the possibility of aluminum, titanium, and iron extraction to sulfuric acid solution and subsequent selective precipitation using suitable separeation methods was designed and tested in a laboratory scale. Separation of selected elements from the fly ash matrix was carried out at room temperature and then at the boiling point of the used solvent.
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