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Multifunctional garden ponds and reservoirs
Kraváček, Václav ; Pumprlová Němcová, Miroslava (referee) ; Kriška-Dunajský, Michal (advisor)
The bachelor's thesis deals with the issue of garden ponds and reservoirs with a focus not only on technical design, but also on long-term maintenance of water quality. The main part of the work is devoted to a more detailed description of materials intended for the construction of garden ponds, technical equipment, or the arrangement of individual zones in the pond. Furthermore, the work deals with a detailed description, parameters and character of selected types of reservoirs, such as ponds intended for fish farming, or natural bathing habitats. Last but not least, the work is conceived as a literary search of fundamental knowledge in the field of implementation of garden ponds and their maintenance. The theoretical knowledge is followed by the second part of the work, focused on the design of two variants of the design of a garden pond for a selected investor.
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Properties of anaerobic sewage sludge from small producers
Pospíšil, Jaroslav ; Kriška-Dunajský, Michal (referee) ; Hyánková, Eva (advisor)
The bachelor thesis deals with today's wastewater treatment from small producers and characteristics of primary sludge. Work is focused on natural ways of wastewater treatment. The main attention is devoted to the primary sludge. In the next section are based on laboratory tests, where samples are tested properties. There is tested the primary sludge from the mechanical pre-treatment, and namely from the sedimentation tank.
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The Research on Regeneration of the Filter Material, used in the Soil Filters and Constructed Wetlands
Burešová, Hana ; Rozkošný,, Miloš (referee) ; Kriška-Dunajský, Michal (advisor)
The thesis consists of two basic parts. The first research part creates an introduction to the root zone wastewater treatment plants. It contains mainly causes of filter environment colmation and its theoretical solution methods, which are further solved in the laboratory. The master’s thesis attempts to find a simple way, which would in future be possible to evaluate the rate of sedimentation of the sludge material, which causes filtration environment colmation. Results of developed methodology will be used in practice by washing colmated filtration material, respectively colmatant separation in sedimentation tank. The thesis focuses to verify the possibility flocculation and mineralization of sludge, which adheres to the surface of the filtration material. The solution lies in the observation of sedimentation rate (after previous dilution) using by the turbidimetric method, based on the beam-column passage through muddy water. The results show that it is not critical ambient temperature, but the time effect of natural mineralization in combination with moisture (dry matter concentration, the amount of water). The present thesis evaluates the possibilities and application method, leading to the natural regeneration of the filtration material exposed to natural climatic conditions.
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Cleaning efficiency of vertical root filters
Opletal, Jan ; Hyánková, Eva (referee) ; Kriška-Dunajský, Michal (advisor)
The aim of this thesis was a survey about efectivity of vertical flow constructed wetlands. I find out, that vertical inttermitently flooded constructed wetland proved to be the most effecicient in pollution removal, based on data analysis form constructed wetland treatment plant in Kotenčice. The only disadvantage was weak denitrification process. Vertical filter was compared with series of horizontal and vertical continuosly flowed constructed wetland. Combination of horizontal and vertical filter was efficient enough to treat waste water, but it cannot be compared with vertical intermittently floded filter. Series of horozontal and vertical fully flooded constructed wetland had a low treatment efficiency.
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The Use of Recycled Building Materials for Wastewater Treatment
Zedník, Ondřej ; Pumprlová Němcová, Miroslava (referee) ; Kriška-Dunajský, Michal (advisor)
The constantly tightening wastewater treatment legislation require high-quality runoff from small-scale producers of pollution who are typically represented by small municipalities up to 500 inhabitants or decentralized parts of larger municipalities. Small municipalities are faced with high investment-intensity associated with the acquisition of new wastewater treatment plant. After several years of development, today natural technologies of wastewater treatment are in competition with mechanical-biological treatment plants. Natural technologies can even achieve better results than popular biological treatment plants. However, natural technology does not eliminate the main investment limit connected with the acquisition of wastewater treatment plant. If there was cheaper solution connected with using alternative filter materials (in our case recycled construction and demolition waste), small municipalities could take constructed wetland without large subsides. At the same time, the use of recycled construction and demolition wastes will lead to benefits in the field of sustainable urban development and replacement of non-renewable materials. Despite these benefits, recycled aggregates have never been considered as alternative filter materials for natural wastewater treatment plants. For that reason, the aim of diploma thesis is to assess the possibility of applying recycled aggregates for wastewater treatment which will include evaluation of real trial operation.
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Optimization of full-scale denitrifying bioreactor design
Novotná, Klára ; Kriška-Dunajský, Michal (referee) ; Malá, Jitka (advisor)
By leaching from agricultural areas, high concentrations of nitrates enter rivers and groundwater. Denitrifying bioreactors are one of the possibilities to reduce pollution intake into water. The aim of this thesis is to optimize design of a full-scale denitrifying bioreactor in the Czech Republic. In the theoretical part, the denitrification process and the technology of denitrifying bioreactors are characterized. Furthermore, existing methodological documents dealing with their design are presented and the influence of design parameters on the performance of the bioreactor is described. In the practical part of the thesis, a denitrifying bioreactor is designed near the village of Němčice in the South Moravian Region. For this purpose, based on the already existing methodology of Hrich et al. (2018), an optimized methodology for the design of denitrifying bioreactor parameters was developed using the knowledge from the theoretical part. For a target flow rate of 17.4 l.s-1, a bioreactor with a 1:1 aspect ratio, a trapezoidal cross-section in both directions and a 422 m3 woodchip volume was designed. The bioreactor occupies 0,05 % of the drained area.
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Linking technical and natural infrastructure to climate change in cities
Svobodová, Lenka ; Hyánková,, Eva (referee) ; Hyánková, Eva (referee) ; Kriška-Dunajský, Michal (advisor)
The thesis is focused on linking technical and natural infrastructures in cities with respect to climate change. Various means of growing plants are presented by introducing urban farming. In the first, theoretical section, climate change is claimed to be a global threat for human kind which is more and more visible in cities. Many examples of adaptation and mitigation of climate change in cities are displayed. In the second, practical section, one existing technical measure from Brno city is examined – difference between technical and natural infrastructure is demonstrated. Finally, calculation method for environment-friendly crops growing, not only for cities, is introduced.
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The waste management of the constructed treatment wetlands
Mrvová, Michaela ; Hyánková, Eva (referee) ; Kriška-Dunajský, Michal (advisor)
The thesis is focused on the sludge management at root sewage treatment plants with focus on volum eis highest – sludge manahement. Sludge dewatering using sludge dryiing bed is still condemned designers mainly due to their lack of experience, while at the same time enforcing technologically complex solutions. Therefore, the thesis focuses on the break down balance hydrological equation sludge drying bed, which includes all parameters affecting water balance system. The result is a proposal not only design, but in particular a description of input data and the governing equations in software Reed-Bed, which is calibrated own operational results obtainde for the two sewage treatment plants (village Dražovice and Kotenčice). Reed-Bed software will perform sevetal functions: setting the ground area of sludge bed, investment costs required for the implementation of sludge bed, return on investment, the determination of moisture contene of sludge in the sludge bed and maximum lenght of the dewatering period with regard to wetland vegetation. The second largest item within sludge system creates biomass wetland plants, so work deals with possibilities biomass processing plant at the end of the growing season. Technological processing of biomass was tested on common reed, final product pellets for heating.
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Study of wastewater management solutions for the village of Lhotka
Vojvodík, David ; Pumprlová Němcová, Miroslava (referee) ; Kriška-Dunajský, Michal (advisor)
The bachelor's thesis is focused on the processing and comparison of possible variants of sewerage in the Lhotka locality. It presents a proposal for three variants for improving the state of wastewater management in Lhotka. Option 1 envisages the design of a mechanicalbiological WWTP for sewage, with the proviso that the existing unified sewer will be used for rainwater drainage. Option 2 includes the design of an extensive type of wastewater treatment plant and the completion of the existing integrated sewerage system. The last variant 3 includes the pumping of wastewater by discharge to the Malenovice WWTP. The solution is in accordance with PRVKZK. An overview of economic demands is created for individual technological solutions. The aim is to determine the most suitable solution from an economic and technical point of view.
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Reconstruction of storm water overflow for constructed wetlands
Herman, Matej ; Hyánková,, Eva (referee) ; Kriška-Dunajský, Michal (advisor)
The thesis of my bachelor work is the design of a new control system of through-flow area in the existing storm water overflow channel, which is used in current constructed wetland, located in Drážovice village and which does not fulfill flow conditions. The target of the work is to design and verify the function of the controller which ensures decreasing of the flows, or reduction of the water level height in case of overflow during raining. Prior to the design, there had been made mathematical and graphic descriptions with using of the Excel and AutoCad and the results are applied for the laboratory model. The thesis consists of the theoretical analysis of the current status and the new solution design. The main point is based on the control of the water level in overflow channel with flexible diameter from 0.3 m till 0.2m. The construction of the existing storm water overflow channel was done in laboratory conditions, as well as the new designed controlled device. After built-up of the model, there have been made measurings and following corrections to reach the ideal status. For using of this controller in constructed wetland in Dražovice, there will be also needed very precise set up of this device for its everyday usage.
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