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Concentration of nickel in wastewater and its removal using a constructed wetland
KOUKLÍKOVÁ, Etela
This bachelor thesis is focused on the determination of the efficiency of the nickel removal from wastewater using constructed wetlands. During 2015, wastewater from the vegetation wastewater treatment plant in the villageSlavošovice was analyzed. Nickel concentration in wastewater was determined by atomic absorption spectrometry. Samples of wastewater were taken eight times from six different parts of the wetland. The obtained results of the wastewater analysis I evaluated the degree of the nickel removal in the profile of the vegetation wastewater treatment plant. The analysis was conducted using an atomic absorption spectrometer Thermo Scientific iCE 3500. The characteristics of the analytical method were as follows: accuracy (97.64%), precision (3.53%), sensitivity (9 x 10-3 s.l/g), limit of detection (LOD = 0.161 ?g /l), limit of quantification (LOQ = 0.537 ?g/l), linear dynamic range (0,537 - 10 ?g/l) and correlation coefficient (0.9992). The concentration of nickel obtained from samples from the inflow zone differed by several tenths or units of ?g/l compared to the inflow concentration value. The nickel of concentration at the outflow from the system was decreased by units of ?g/l compared to the inflow. The gradual decrease of the concentration of nickel was observed for the samples taken from the profile of the constructed wetland vegetated bed. The obtained results document the sufficient efficiency of the nickel removal from municipal wastewater in Slavošovice constructed wetland. The outflowing water, guided to a nearby stream, contains lower concentrations of nickel in comparison with the raw wastewater. With respect to aquatic organisms, it is very important to reduce the concentration of nickel in treated wastewater. Actually, the nickel toxicity for aquatic organisms is much higher than for humans.
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LabVIEW drivers for resistor decade
Procházka, Matěj ; Čala, Martin (referee) ; Havlíková, Marie (advisor)
This bachelor's thesis deals with description resistance decade M63x and M64x from Meatest company. I described functions and possibilities of remote access. Further are described how it's developed instrument driver in LabVIEW. At the end is cited how I conduct with testing this driver.
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Study of influence of admixtures on electrochemical characteristics electrode materials for lithium-ion batteries
Nejedlý, Libor ; Jirák, Tibor (referee) ; Sedlaříková, Marie (advisor)
The bachelor project deals with new intercalation materials with admixtures for positive electrode of lithium-ion accumulators. Concretely, the project works with new preparation methods of electrode materials and compares them with long-established industrial process. For this purpose were used electrochemical measurements and structure analysis obtaining materials. The theoretical part of the project is devoted summary of electrochemical power sources, electrochemical reactions, recycling and future of Li-ion batteries. The practical part describes electrochemical methods, measurements and discusses achieved results.
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Influence of Mn ionts in nickel hydroxide on behavour electrodes
Cirkovský, Jaroslav ; Vrbický, Jiří (referee) ; Sedlaříková, Marie (advisor)
The aim of my diploma thesis was to explore the influence of manganese ions put into nickel nitrate structure. The attention was focused mainly on the stabilization of nickel nitrate a modification, which could not change into b modification. The theoretical part of my thesis focused on applied materials, kinds of acumulators, basic parameters of acumulators and the description of chosen methods of measurement employed. It contained the electrodeposition, the impedance spectroscopy and the cyclic voltammetry. The task of the experimental part was to measure the effect of manganese ions put into potassium hydroxide structure. Proportions of Ni (nickel nitrate) : Mn (manganese nitrate) 10:0, 7:3, 5:5, 6:1 and 6:4 were blended for the measurement. By means of the electrodeposition, there was a thin layer of nickel hydroxide with an admixture of manganese ions from nickel nitrate and manganese nitrate dilution put on the nickel plate. After the spread of the thin layer on the nickel plate, the measurement by the method of cyclic voltammetry followed. The next task consisted in trying to add KOH (potassium hydroxide) anionic and cationic surfactant into the dilution.
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Preparation and evaluation of metallic contacts for crystalline
Frodl, Miroslav ; Jandová, Kristýna (referee) ; Hladík, Jiří (advisor)
This work deals with the advanced methods of contact’s fabrication for monocrystalline solar cells and the appropriate methods for the analysis of their properties with a focus on the study and realization the contact’s structures with low contact and sheet resistance fabricated by galvanic and electroless processes. In the first part of the work is discussed the theory of solar cells and buried contacts and in the second part of the work is an evaluation of practical realization.
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Diffusion in humic gels.
Královič, Michal ; Pospíšilová, Ľubica (referee) ; Klučáková, Martina (advisor)
This bachelor thesis is focuses on study of heavy metals diffusion in humic gels. The objective of the work was to verify, whether the diffusion is influenced by methylation of humic acid. Cupric and nickel cation was used in this thesis. Absorbance of solutions in acceptor and donor diffusion cell part was measured spektrofotometrically.
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Reaction synthesis of bulk intermetallic materials in Ti Ni system form kinetic spraying deposits
Dyčka, Martin ; Moravčík, Igor (referee) ; Jan, Vít (advisor)
Bachelor’s thesis deals with intermetallic compounds which are formed in nickel-titanium binary system. The theoretical part of this thesis deals with the best known titanium based intermetallics, diffusion and possible processing technologies of intermetallic materials. In experimental part, a nickel-titanium coating created by cold spray technique was used. The changes in microstructure depending on annealing temperature were analysed. The results contain photographs of microstructure and fractures, values of microhardness and results of chemical analyses.
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