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Possibilities of using different types of admixtures in shotcrete technology
Berčík, Martin ; Brožovský, Jiří (referee) ; Hubáček, Adam (advisor)
The Bachelor’s thesis is conceived in the form of research findings on current knowledge of inert and active ingredients and their effects on the shotcrete. It focuses mainly on the composition of individual ingredients, their function executing in the concrete mix and explains how they affect the selected physical and mechanical properties. The work enlightes the importance of using co-products from the industry production as an additive to concrete in terms of both ecological and partly economical.
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Rehabilitation technology of embankment dams by using suitable types of waste
Michalčíková, Magdaléna ; Kulísek, Karel (referee) ; Drochytka, Rostislav (advisor)
The subject of this work is to find an optimal technology for repairing existing embankment dams with emphasis on simplicity and ecological scalability. Next, secondary energy and waste materials will be evaluated as a partial replacement of a quality montmorillonitic clay. The aim of this will be to maximize the use of these waste materials. In the end a selection of materials for the locality will be made. The use of appropriate types of waste for repairs of embankment dams with clay based grouting compound technology has a great potential, especially with those dams that are not fulfilling their function due to their age.
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Prediction of ash production as a side effect of burning coal in the coal power plant Ledvice
Zikmundová, Alena ; Kuncová, Martina (advisor) ; Houšková Beránková, Martina (referee)
The topic of this thesis is the prediction of production of ash as a side product in the coal power plant Ledvice. The goal of the first two chapters was to present the development of consumption of electricity and the resources of electric energy in Europe, show the trends in energy industry at the beginning of the 21st century, introduce the energetic company ČEZ, summarize the issue of side products in power plants and present the new block of the coal power plant Ledvice. In the theory section, the methods of linear programming, simulation models, linear regression model and artificial neural networks were presented. These methods were used in the application section to create an optimization model for the processing of the side products of burning coal, to create a simulation of the production of side products and to use the results to optimize the processing of the side products of burning coal and to create a model to predict the production of bottom ash to coal burned ratio based on the characteristics of the coal burned moisture, ash and lower heating value using artificial neural networks.
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The lipid quality of our economically significant fish species
KREJSA, Jakub
The level of fish consumption in the Czech Republic is very low. One of the possible factors influencing this situation is low awareness of the customer or consumer. The thesis "The Lipid Quality of our economically significant fish species" works with the list of nineteen economically most significant fish species not only including fish from the semi-intensive and intensive breeding, but also such species that are interesting for the consumption from the sport fishing point of view. The samples taken from particular fish were primarily used for the analysis of the fat content and fatty acid composition. The analysis established very interesting results in this field and created basis for further analysis for establishing atherogenic and thrombogenic index or for formation of nutritive values mentioned as "Big 7" (fat content and the ratio of fatty acid out of it, sacharide content and the sugar ratio in it, protein content, ash content and energy value) by particular fish species according to the regulation ES 1169/2011. The results of this work confirmed that the fat content and its composition are highly influenced by the type of ingested nourishment. The fish bred in semi-intensive way with the highest fat content are Common carp (7,62 ? 2,9 %) and Silver carp (6,87 ? 1,37 %). On the contrary the predatory fish evinced the fat content usually within 1%. The fish from extensive breeding or the types caught in sport fishing are in the fat con-tent more balanced. The fattest fish in this group is Silver Bream (5,52 ? 0,44 %) and the lowest content evinced Goldfish (1,14 ? 0,38 %). Also the species living in the aquaculture and living in the free waters as well were compared (Common carp, Rainbow trout, Peled, Tench, Wels catfish). The fatty acid composition significantly depends on the fat content. The predatory fish contain 195 - 219 mg×100 g-1, the most (p0,05) was found by the peled from the extensive breed (1048 mg×100 g-1 EPA + DHA). The participation of SFA by the most of the fish was under 30%, the content of MUFA was the highest by the Common carp (52,71 ? 7,75 %), the lowest by the European perch (18,83 ? 1,12 %). Pike, Zander and European perch contain relatively the most of PUFA, this is over 50%. All the fish species (Nile tilapia excluded) show in this study the values of atherogenic index below 0,5 and thrombogenic index below 0,4. The total energetic value was counted from the results of nutritional values presented in the "Big 7" list. The higher energetic value is directly proportional to the increasing fat content. The fish species included in this thesis show the total energetic value in the range of 500 - 900 kJ×100 g-1. The results of this study bring complete, laboratory proven information about the nutrition composition of our fish. This data can be appli-cable not only to increase the knowledge of the customers but mainly to be used by breeders and manufacturers of fish as an implement of fulfilling the duty of stating the nutrition facts on their products according to ES 1169/2011 on the providing infor-mation about the eatables to the consumers.
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The ash quality monitoring of biomass combustion
Tlustoš, P. ; Ochecová, P. ; Száková, J. ; Perná, Ivana ; Hanzlíček, Tomáš ; Habart, J. ; Straka, Pavel
The aim of methodology was, on the basis of results of analyzes of ash from more than 40 sources in the Czech Republic, these ash categorize by feedstock and identify suitable ash for use on agricultural land. It could lead to a significant shift to reduce the cost of incinerators, to the entry of new businesses on the market and to easier fulfilling of republican obligations in the share of energy production from renewable sources. Another advantage of finding employment for these materials, from an environmental view, is the reduction of landfilling and support for recycling of nutrients. The methodology presented the process for the selection of suitable ash for agricultural purposes and the reader should be able to determine the applicability of the material.
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Výzkum skutečných vlastností odpadů považovaných za vhodný zdroj nestandardních surovin (zejména vedlejších energetických produktů) ve smyslu současných právních požadavků na ochranu zdraví lidí‚ životní prostředí a vyhodnocení získaných informací pro stanovení bezpečných postupů a požadavků pro jejich získání
Státní zdravotní ústav , Praha ; Vysoká škola chemicko-technologická v Praze ; UNIVERZA - Středisko odpadů Praha‚ s.r.o. ; Veverková, Milena
Shrnutí dosažených výsledků a popis postupu v kapitolách: Stanovení obvyklé kvality zbytků po spalování uhlí (VEP) v ČR ve srovnání s požadavky právních předpisů, Technický podklad pro návrh metodiky pro právní orientaci v problematice bezpečného nakládání se zbytky po spalování uhlí, určený pro jejich producenty, kteří s nimi nechtějí nakládat v režimu zákona o odpadech, Technický podklad pro návrh kriteriálních požadavků na bezpečné nakládání se ZPSU (VEP) mimo místa určená k nakládání s odpady - vymezení jednotlivých druhů (typů) prostředí, Technický podklad pro stanovení kriteriálních požadavků na kvalitativní charakteristiky výrobků ze nebo s obsahem zbytků po spalování uhlí, v rozsahu sledovaných ukazatelů a druhů zkoušek, které by byly využitelné pro technický předpis použitelný v rámci uvádění příslušných výrobků na trh - certifikaci výrobků, Kvantifikace materiálových toků provázejících chod energetických zařízení v ČR a kvantifikace obvyklých materiálových toků (bilance škodlivin) zatěžujících okolí míst, v nichž je nakládáno se zbytky po spalování uhlí, Vyhodnocení současného stavu klasifikací (číselníků) používaných pro popis předmětných materiálových toků v systému statistické služby a posouzení požadavků na jejich úpravu. Návrh postupu při certifikaci výrobků z VEP se zaměřením na snížení (optimalizaci) úniku škodlivin do životního prostředí, Technický podklad pro národní právní úpravu nakládání se zbytky po spalování uhlí (splnění nebo změna POH ČR a POH původců).
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