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It is necessary to consider the increasing problem of the environment and better quality of people living. This thesis focuses on modernization of the system, which cleans the wastewater in municipality of Kout na Šumavě. These days it is taking place the second phase of building a sewerage system, that would be partly financed from European Union funds within the operation program of Environment. The thesis is split into two main parts. The first theoretical part contents the basic theory, where are described the financial funds, the basic theory of the wastewater treatment and also the problematic of multi-criteria decision making and it´s methods. Mentioned methods relate to solving the problems of decision-making situations. The second practical part performs particulary solution of the given problem. In the practical part are used all identified findings and background materials for evaluation and for selection the right decision making situation. This would be solved by application of mathematical methods. All identified results, that used mathematical methods, are evaluated and suggested to the representatives of the municipality. They referred the results to the general contractor.

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The main aim of the thesis is to propose or initiate how the technology of sewage treatment in village Dyjákovičky can be modified or upgraded. Special attention is paid to the legislative aspects and the efficiency and conditions of treated wastewater (effluent) that goes back to the recipient. Integral part of the thesis is classification of types of wastewaters and most frequent technologies used for wastewater treatment in small or medium size wastewater treatment plants using specific methods of mechanical pretreatment and biological processes. The technology equipment used in Dyjákovičky is described into details. In response to main aim of the thesis, the actual state of the equipment as well as the state of the whole wastewater plant are assessed in order to identify the main risks and threats. Identification of risks and threats also reflects the presumed demographic and legislative development of implementation of technological and operational measures to improve the parameters of treated water into the recipient.

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The thesis "The Evaluation of the Effectiveness of the Sewage Disposal Plant in Náměšt nad Oslavou" compares the effectiveness of two wastewater treatment technologies, the first and the current one. The practical part deals with the importance of treatment of sewage and the overview of the legislation dealing with water. It also describes the types of wastewater, some indicators of pollution of water from sewage and particular possibilities for wastewater treatment. The practical part contains a description of wastewater management in the town. It also describes of the historically first and the current wastewater treatment technologies and contains the survey of the water permits intended for water management. The chapters "Evaluation of Results" include graphs of the results of the analytical control of wastewater and the defined flow rates. The results show that the first-ever sewage disposal plant was insufficient for the needs of the city, which led to the construction of a new wastewater treatment plant. The existing wastewater treatment technology is adapted to the current needs of the city and is also taking into account its future development. The existing wastewater treatment plant fulfills the minimum requirement values of the wastewater treatment efficiency. The concentration of the pollution of wastewater at the wastewater treatment plant does not exceed the prescribed emission standards. The hydraulic and substance demand on the technology achieves the mean value.