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Determination of Economic Efficiency of the Public Contruction Project
Šafář, Vít ; Witala, Lukáš (referee) ; Korytárová, Jana (advisor)
Bachelor’s thesis is focused on evaluating the economic efficiency of the construction project of sewerage treatment plant. The first part contains a presentation of the basic concepts of financial statements describes the assessment methods and, more generally, the issue of wastewater treatment. The second part deals with the practical applications of evaluation of economic efficiency. The aim is to analyze the specific project in Kunštát na Moravě.
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Phosphorus recycling - need or urgency
Holba, Marek ; Došek, M. ; Škvoran, O. ; Matysíková, J. ; Plotěný, K. ; Maršálek, Blahoslav
Phosphate policy is tightly connected with effective solutions in agriculture, but also with its removal from water environment where excessive concentration of phosphorus is not welcomed since it causes water bloom and worsening og surface water quality. Phosphate ores will be depleted soon and therefore recacling technologies should be introduced into practice in near future. Struvite - slow-release fertilizer seems to be good commodity for farmers. Struvite is usually responsible for clogged pipes in the wastewater treatment area. Therefore, several technologies of its recycling is recently being developed, esp. from reject water stream. Struvite crystallization, its production control and scale-up of technology from lab-scale through pilot-sclae to full-scale is technological challenge in the near future.
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Wastewater Treatment Using House Sewage Treatment Plants {--} Hygienic Aspects and Usage in the Czech Republic
FIŠEROVÁ, Alena
Constructed wetlands (CWs) originate from natural wetlands and are used for waste water treatment as an alternative to conventional treatment. This thesis was aimed at providing a literary summary of the types of house sewage water treatment plants and constructed wetlands used in the CR and abroad, of their hygienic aspects, functionality, treatment efficiency, expensiveness and the possibilities of their use in the conditions of the CR and their advantages and disadvantages. It also deals with a proposal of a suitable type of house CW for the conditions of the CR and a list of the necessary steps in construction of a house CW. Quite similar systems are being used for house sewage treatment in the Czech Republic and abroad {--} mostly septic tanks, ground mounds, constructed wetlands, active treatment plants and biodiscs. Alternative water treatment methods are generally not suitable for buildings having (now or in the future) the possibility of connection to municipal sewerage systems. They are on the other hand suitable for buildings not connected to sewerage systems or for seasonal objects, remote places and holiday houses with seasonal waste water production. A system with horizontal subsurface flow is mostly used as a CW in the Czech Republic. This CW type ensures sufficient removal of organic contamination and insoluble substances, but the efficiency of nitrogen and phosphorus removal is relatively low. However it is fully sufficient in the instance of low PE numbers, as the loading rate is usually low and the concentration of contaminants in the output water meets the prescribed limits. Foreign researches show that hybrid systems combining horizontal flow with vertical flow and with recirculation are more suitable for improving efficiency of nitrogen removal. Systems with vertical flow and intermittent waste water dosage showing particularly good results in ammoniac removal are also suitable for nitrogen removal. Special materials with higher iron, aluminium or calcium content are most suitable as filling of a constructed wetland or as additional filters or for improvement of phosphorus removal from waste water as they are able to reach efficiency of up to 90 %. In my thesis I came to a conclusion that a CW with horizontal subsurface flow is the most suitable type of house constructed wetland treatment for the conditions in the CR, mainly because it is the most frequently used and thus best proven CW type with sufficient efficiency of treatment for the substances required by standards.
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The efficiency of the anionactive surfactants degradation in a constructed wetland vegetation bed.
HAVELKA, Michal
This bachelor thesis is focused on the validation of the anionactive surfactants spectrophotometric determination method. Data from the seasonal monitoring of the anionactive surfactants in a constructed wetland for wastewater treatment with a horizontal subsurface flow were used for the anionactive surfactants degradation efficiency determination and for the determination of the relationship of the wastewater inflow, the constructed wetland´s water temperature, and the constructed wetland´s water redox potential to the degradation efficiency. The spectrophotometric method of the anionactive surfactants determination with methylene blue was used during the study.
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