National Repository of Grey Literature 53 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Ecological status of Lake Baikal
Mongolova, Marina ; Komendová, Renata (referee) ; Zlámalová Gargošová, Helena (advisor)
The aim of this bachelor thesis was to study the ecological status of Lake Baikal. The research focuses on the main problems related to the impact of human activity on the lake. During the study, data on the hydrochemistry of the lake and its tributaries were analysed and scientific papers on the ecological status of Lake Baikal were reviewed. Based on the data were identified the main types of pollutants and places of their concentration. As a result of this work was obtained a more complete picture of the condition of Lake Baikal and were identified its main problems.
Hygienická kvalita ryb v 10 údolních nádržích ČR
ŠTEFAN, Daniel
The aim of the theses was to judge the hygienic quality of the most caught and consumed fish species living in 10 Czech water reservoirs according to chosen chemical substances (Hg, Cd, Pb, PCB, DDT, HCH, HCB) in their muscle tissue. The analysed fish were caught between the years 2019 - 2020. The analyses were made by the accredited laboratory of the State Veterinary Institution in Prague. To compare the pollution of individual reservoirs and to compare the results of the monitoring from 2006 - 2010 was as a reference species chosen common bream (Abramis brama). Further, five most frequently caught fish species were taken from each reservoir. The overrun of valid hygienic limit for mercury was found in 15 samples in total out of 6 localities (Lipno, Hněvkovice, Kořensko, Orlík, Skalka and Rozkoš). The highest concentration of mercury (2.948 mg.kg-1) was measured in the mixed sample of muscle tissue of asp fish (Leuciscus aspius) from the Skalka water reservoir. The results of the analysis of other fish muscle tissue from this reservoir proved its continuous strong pollution of mercury. The hygienic limit for the plumb content was overrun in the mixed muscle tissue of common carp (Cyprinus carpio) from Hněvkovice water reservoir in 2019. The repeated analysis in 2020 did not prove an increased contamination of the muscle tissue of the carp from this locality. Other watched pollutants in all samples were below the valid hygienic limit. Statistically important changes of the muscle tissue contamination of common breams by mercury in comparison with the monitoring from the years 2006 - 2010 were found in Lipno, Kořensko, Těrlicko, Žermanice and Skalka localities. However, most of the time there was a connection with different weight of fish used for the analysis. In some localities the increase of PCB was found in comparison with the previous monitoring. The values, however, were deep below the valid hygienic limit. Based on the results of the analysis were also counted recommended numbers of meat portions (170 g) for individual fish species from all localities, possible to be consumed in a month without any health risks. The limiting pollutant in all samples was mercury (or more precisely methylmercury). The results of the thesis proved that the hygienic quality of the fish in all fishing grounds is very good. Certain risk could only be a frequent consumption of predator fish of all sizes. The only exception is the water reservoir Skalka, from which, due to strong contamination with mercury, the consumption of fish cannot be recommended.
Variability of water quality parameters in selected reservoirs in Prague
Stará, Eva ; Ettler, Vojtěch (advisor) ; Chalupová, Dagmar (referee)
Small water reservoirs in urban areas have important landscape-forming and environmental roles. However, numerous anthropogenic activities can influence the water quality in these urban ponds. This thesis evaluates and compares the water quality in selected ponds in Prague area (Motol, Stodůlky, Háje) by means of regular water monitoring between May and November 2013. Parameters commonly used as indicators of anthropogenic load were monitored (NO3 - , NH4 + , PO4 3- , Cl- , dissolved oxygen, chemical oxygen demand) and supplemented with the investigation of other chemical and physico-chemical parameters (alkalinity, acidity, water hardness, pH, Ca2+ , NO2 - , specific conductivity). Data were evaluated using Czech technical norm (ČSN - EN 75 7221), which defines five categories of surface water quality. Our data indicated that surface water from reservoirs in Motol exhibited the best water quality (1st category), reservoirs from Stodůlky were slightly polluted and reservoirs from Háje exhibited the poorest water quality (with some parameters exhibiting values corresponding to the 4th category). We found statistically significant correlations between the alkalinity, water hardness, COD and concentrations of NO3 - , Ca2+ , Cl- and PO4 3- . Moreover, numerous parameters are dependent on cumulative...
Analysis of trace pollutants in water and their photocatalytic degradation
Štěpánková, Sandra ; Rathouský, Jiří (advisor) ; Nesměrák, Karel (referee)
Mesoporous TiO2 films with variable thickness were prepared by dip-coating. Two kinds of sols were used, sol 1 and sol 2, which were separately tested and compared. The activity of samples of these sols was tested employing photocatalytic degradation of 1.10-4 mol.dm-3 4-chlorphenol. The efficiency of the degradation of 4-chlorphenol was increasing proportionately with each additional layer. The optimum turned out to be three layers.
Comparison of Selected Adsorbents for Removing Metals from Water
Moravčíková, Světlana ; Biela, Renata
Various metals and their compounds are among the number of substances that currently pollute drinking water sources. A laboratory experiment was performed to compare selected sorption materials for removing metals from water. Filter columns filled with selected sorption materials GEH and Bayoxide E33 were used for experimental comparison. The metals arsenic, nickel and lead were removed from the water by sorption. Based on several criteria, Bayoxide E33 was evaluated as a more suitable material.
Statistical Analysis of Air Pollution by Selected Pollutants
Pernicová, Veronika ; Durnová, Markéta (referee) ; Balgová, Zuzana (advisor)
This thesis analyses an occurrence of detected pollutant concentrations of nitrogen oxides, dust particles of the size od 10 and 2,5 m and ground ozone in years 2015-2019 in seven chosen locations in Brno agglomeration. In the introduction, the thesis describes basic terms, the issues of air pollution and relevant legislation. Individual pollutants are defined and also their effect on environment and human health. After that, the locations of Brno, for which the analysis is made, is specified. The dynamics of development of individual pollutants is shown through a statistical analysis of individual time lines. The analysis also focuses on the difference in the level of pollution during weekdays, holidays, seasons or rush hour. The quantities are also viewed from the point of view of the relevant air pollution limits and the influence of climatic factors, which significantly affect their concentrations.
Risk of Waste Combustion in Small Boilers
Kopecká, Eliška ; Špiláček, Michal (referee) ; Lisý, Martin (advisor)
The bachelor's thesis deals with the issue of waste combustion in small boilers. In the first chapter, the components of household waste are specified in more detail, as well as the pro-duction and possible waste management. The second chapter is focused on the formation of the pollutants during combustion and their impact on the environment and the human organ-ism. In the third chapter is presented the process of the operation of the waste incinerator and there are mentioned the limit values of the emissions that are released into the air. The fourth chapter deals with the reason for the origin and the comparison of the pollutants aris-ing from combustion in small boilers. Materials defined as household waste and pollutants released from them during incineration are described here. In the end, the results of the the-sis are evaluated.
Low emission zones as an instrument of air protection in selected European Union's states focusing on the Czech Republic
Vaňhara, Martin ; Žákovská, Karolina (advisor) ; Sobotka, Michal (referee)
The presented diploma thesis provides the comprehensive presentation about the low emission zones that become more and more used instrument of air protection in european metropolises and in smaller cities. There are already circa sixty low emission zones in Deutschland, in the Czech Republic this instrument hasn't been used yet. Therefore the diploma thesis' determined goal was to analyze the legal regulation of the low emissions zones to clearify the division consisting in absence of low emission zones in the Czech Republic. Systematicall structure of the diploma thesis into six part is the result of the author's aim to make the presentation transparent. The first part of the diploma thesis represents the introduction into the theme of the air protection and provides a brief overview of relevant legal regulations just as the analysis of air pollutants including their negative effect on the peopel's health and on the environment. The author provides the presentation of transport regulation possibilities that the cities are able to realize (excluding the low emission zones). The third part deals with the implementation of the low emission zones into the czech law and with the development of legal regulation of the low emission zones. The detailed analysis of current legal regulation regarding the...
Verification of the use of agro pellets for heating
Muzikářová, Věra ; Musilová, Petra (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with agropellets and their combustion in terms of emissions and efficiency. It consists of two parts. The first part is theoretical, where the search of available types of biomass, production of agropellets and combustion principle is presented. The second part of the thesis is focused on experimental comparison of efficiency and emission class of boiler for various agropellets.
Forming of solid pollutants from biomass
Havlínová, Denisa ; Štelcl, Otakar (referee) ; Baláš, Marek (advisor)
This bachelor‘s thesis is divided into two main parts. The first part is research and deals mainly with biomass and pollutants. In this section, we will find a two-dimensional distribution of biomass, a comparison of fuel forms and a discussion of basic pollutants with a focus on solid pollutants. The second part is experimental. It starts with a fuel laboratory, where the water, ash and heat content of the biofuels examined is determined. The following is an investigation of the dependence of the PM formation on the properties of the biomass, which was measured by the measurement of these PM by the filters in the collecting device, while the examined biofuels were gradually burned on the fireplace insert.

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