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Analysis of the effectiveness of the photocatalytic effect in surface treatments
Holubová, Petra ; Žák, Antonín (referee) ; Žižková, Nikol (advisor)
The thesis deals with the possible use of the photocatalytic effect in construction practice. Surfaces with this type of treatment have the ability of a so-called self-cleaning effect. Based on the research, the basic principles of the evaluation of photocatalytic substances and its possible applications were written down. Furthermore, the issue of staining facade plasters was outlined. The goal was to analyze the effectiveness of the photocatalytic effect in surface treatments. A photocatalyst of two types (anatase and rutile) and two rounds (2% and 5%) was added to the plaster mix. Next, the samples were contaminated with dyes and dust particles, and then the samples were placed in the QUV tester or exposed to outdoor climatic conditions. The photoactivity of individual plaster mixtures was evaluated on the samples based on color changes during testing. Plaster with TiO2 in the form of anatas dosed in 5%, according to a modified evaluation based on UNI 11259 and JIS 1703-2:2007 standards, photocatalytic properties, and thus a self cleaning process occurred.
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Změny kvality vody vybraného toku v obci Kojčice
Koranda, Rudolf
The bachelor thesis focuses on monitoring the changes in water quality of the watercourse flowing through the village of Kojčice during the year. Village does not have a Wastewater Treatment Plant (WWTP). The samples were taken three times during the vegetative season, at nine localities continuously distributed along the watercourse (mainly at fishponds’ inflow and outflow sites). Samples were analysed in the laboratory of the Department of Fisheries and Hydrobiology at Mendel University in Brno. Total nitrogen, total phosphorus, total iron, dichromate chemical oxygen demand, five-day biochemical oxygen demand, ammonia, nitrite, nitrate, phosphate, acid neutralization capacity, chlorides, calcium and chlorophyll a were determined. Dissolved oxygen, conductivity, pH, water temperature and water transparency were measured at the sampling site. The aim was to determine the impact of the season, the municipality and adjacent cultivated land on the changes in water quality of the watercourse and subsequently assess the ability of the self-purification process in the watercourse. The quality of water was significantly affected by potato fruit juice inflow from the field. The obtained data were compared with the ČSN 75 7221 standard for surface water quality classification. Furthermore, it was compared with the Government Order No. 401/2015 Coll., to determine whether they meet the requirements for general water use and for salmon and carp waters.
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