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Circular economy in the Czech surroundings - experience of companies and the view of experts
Leová, Leona ; Rynda, Ivan (advisor) ; Milerová Prášková, Dagmar (referee)
The diploma thesis deals with the concept of circular economy (hereinafter CE) and its application in several Czech and one multinational company. On these specific examples of companies, the work shows how circularity is achieved, with all the essentials of this fact, what support for the concept is offered in the Czech Republic and, last but not least, what obstacles and problems the companies face. Along with this practical experience, opinions by theoretical experts who deal with the issue in their profession are further examined. The aim of the work was to map the matter of use of secondary raw materials and other principles of CE in both practical and theoretical spheres of knowledge, and where possible, to compare these two views. Furthermore, the work focuses on the benefits of real use of the principles of CE in the Czech conditions from an environmental point of view. In its theoretical part, it first addresses the issue of waste in general, especially from the perspective of a global problem. It presents the development, current situation and forecast of the size of waste generation, including its impacts. Furthermore, it has introduced the concept of CE, its various concepts and definitions, together with the main principles. Subsequently, it presents the real adoption of the concept by...
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Možnosti využití vybraných bezobratlých v odpadovém hospodářství
Žáková, Markéta
Biodegradable waste (BDW) is most commonly processed by composting or anaerobic fermentation, but its composition is not always suitable for these procedures. Therefore, the aim of this dissertation thesis was to find out what possibilities and consequences of using Stratiomyidae Hermetia illucens (HI) in the waste management of the Czech Republic are. In order to meet the objectives of this thesis a total of 14 different types of waste has been selected. Plant tissue waste, kitchen waste, waste from soup kitchens, manure, poor quality and culled municipal biodegradable waste were found as the best types of waste for being reduced by HI larvae. Furthermore, it was found that Californian earthworm are more suitable for producing fertilizers, conversely HI are suitable for reducing BDW. The most favourable conditions for HI so that they are able to reduce waste are enclosed spaces with appropriate air temperatures. Presence of bacteria Salmonella was not detected in accordance with ČSN EN ISO 6579 in the reduced substrate. When measuring the concentration of heavy metals in larvae, in the input BDW, the remaining substrate and the larvae after consumption BDW and determining the bioaccumulation factor (BAF) for larvae HI fed by individual types of BDW, it was found that larvae that would be potential feed for livestock or hobby animals from the perspective of heavy metal content, would have to be fed by plant tissue waste or garden waste. The accumulation of antimony and cadmium occur particularly in larvae fed by separates from biogas plant (BPS), garden waste, plant material and poultry droppings. The final recommendation is to include HI larvae into the waste management system of the Czech republic, although in enclosed spaces.
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