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Removal of organic pollution using advanced oxidation processes
Přibilová, Petra ; Kučerík, Jiří (referee) ; Chýlková, Jaromíra (referee) ; Opatřilová, Radka (advisor)
The presented doctoral thesis deals with the use of advanced oxidation processes combining hydrodynamic cavitation (HC) to produce hydroxyl and sulfur-based radicals. The investigated micropollutants are selected natural estrogens estrone (E1), 17-estradiol (E2), estriol (E3) and synthetic 17-ethinylestradiol (EE2). The theoretical section includes information on the properties of estrogens, their occurrence and effects in the environment on non-target organisms across trophic levels; and list of options for their removal from wastewater. The advanced oxidation processes themselves are also discussed and current knowledge in this area is summarised. In the research section, used analytical methods (LC-MS/MS and spectrophotometry), designs of individual experiments and results of tested processes are described. In addition monitoring the efficiency of different combinations of hydrodynamic cavitation and other agent and the suitability of the materials used on the experimental unit were also investigated. The sorption/desorption onto the surface of selected plastic materials (SBR, EPDM, PTFE, Tygon S3TM, PVDF and PVC) was also evaluated. Based on the results, the material for the unit - on which the degradation experiments were carried out - was selected. The methods chosen for the removal of estrogens from water were HC/H2 O2 , HC/O3, HC/percarbonate, HC/persulfate, hydrodynamic cavitation alone, and H2O2 alone. The design of the experiments was created to minimize the time required to treat the water, ideally one cycle per unit (4 seconds), which corresponds to the flow-through arrangement of the system.
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Application of hydrodynamic cavitation in brewing
Štěrba, Jiří
The aim of this work is to apply these advantages in the brewery industry. In the field of beer brewing, we would like to investigate several phenomena, such as the isomerization of bitter hop acids, the reduction of gluten concentration or the cell-walls breakdown.\n
Plný tet:  PDF
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Venturi nozzle shape influence on hydrodynamic cavitation
Mračko, Patrik ; Balko, Marek (referee) ; Rudolf, Pavel (advisor)
Thesis focuses on the influence of various differently shaped diffusers of Venturi nozzle on the cavitation, which occurs during flow of liquid through said nozzle. Several models with different shapes of diffuser's wall were designed. Cavitation in these models was then investigated with numerical calculation. Two physical nozzles were made according to designed models and tested on experimental circuit. As part of the experiment, the cavitation inside the nozzles was measured with flow of liquid corresponding to a large range of cavitation numbers. Results of this experiment were used to determine which model of the nozzle is more effective in creation of a cavitating flow.
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Application of Hydrodynamic Cavitation in Brewing.
Štěrba, Jiří
We have applied such advantages in the brewery industry. Venturi jet system is chosen as the HC technique due to energy saving and\nrobust design. In the field of beer brewing, we would like to investigate several phenomena, such as the isomerization of bitter hop acids,\nthe reduction of gluten concentration or the cell walls breakdown. All these experiments will be performed on the already constructed experimental brewery system.
Plný tet: PDF
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Application of cavitation in industrial processes
Hamar, Oliver ; Tancjurová, Jana (referee) ; Rudolf, Pavel (advisor)
The bachelor thesis deals with the research of the application potential of cavitation technologies in various industries. Thanks to its properties, cavitation seems to be a promising tool for streamlining a large number of industrial processes in several aspects. The first part deals with the theoretical description of the cavitation phenomenon, its negatives and methods of their detection. The second part focuses on the analysis of possible usage areas of cavitation technologies and the ways of generating the cavitation, focusing on current research and findings in the area of hydrodynamic cavitation application.
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Utilization of hydrodynamic cavitation for water treatment
Balko, Marek ; Kozák, Jiří (referee) ; Rudolf, Pavel (advisor)
This bachelor thesis deals with the observation of features of cavitation with emphasis on the hydrodynamical cavitation and its use for eliminating unwanted and badly degradable compounds from water. Thanks to high temperature and pressures that are present at a colapse of cavitation bubbles the water decomposes into highly reactive hydroxile radicals which are able to decompose even. This effect can furthermore be strenghtened by the use of advanced oxidation processes – AOP. The experimental part of thesis is dedicated to examining a ability of hydrodynamical cavitation degrade particular chemical substance from water, namely estrogen.
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Mechanical properties of cell membranes
Pírková, Marcela ; Pochylý, František (referee) ; Fialová, Simona (advisor)
This thesis is a research character focused on the analysis of mechanical properties of cell membranes. The main aim is to find methods that will break the structure of the membranes. In addition, the thesis deals with the microorganisms living in the reservoirs of the Czech Republic, the existing methods of water purification and the specific properties of microorganisms membranes. In the experimental part there is an attempt of hydrodynamic cavitation, the whole process is tested on biomass of cyanobacteria.
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Dynamics of cavitating flow behind the orifice
Kubina, Dávid ; Kozák, Jiří (referee) ; Rudolf, Pavel (advisor)
Cavitating flow through five perforated plates with different number of holes with preserved constant flow cross-section area in sum were experimentally examined. Dynamic characteristics such as dependence of pressure amplitudes and dominant frequencies on cavitation number in all regimes of cavitating flow: incipient cavitation, partial cavitation, fully developed cavitation and supercavitation are obtained. For determination of dominant frequencies several pressure transducers in two regimes of measurement were used. Results were validated with frequency spectra obtained from picture analysis based on high-speed camera records.
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Cavitating flow in perforated disc
Kubina, Dávid ; Kozák, Jiří (referee) ; Rudolf, Pavel (advisor)
The main goal of this bachelor thesis is to measure hydraulic characteristics of five round plates perforated with several circle orifices installed in the pipeline. The main condition was to preserve constant cross section of the holes in sum. Theoretical part of the thesis is focused on the basics of hydrodynamic cavitation and its practical usage in the industry. The experimental part of the paper deals with hydraulic characteristics of each shield perforated by varying number of orifices and also includes mutual comparison. Also high speed camera was used to detect the length of cavitation zone, although these results are not included in the conclusion of the thesis.
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