|
| |
|
|
Modeling the Impacts of Changes in Waste Management on Key Technologies
Jadrný, Josef ; Suzová, Jana (referee) ; Weidlich, Tomáš (referee) ; Pavlas, Martin (advisor)
The doctoral thesis focuses on waste management planning in the Czech Republic with regard to key technologies. The operation of processing facilities is influenced by strategic documents that reflect the legislative framework of the EU and the Czech Republic. Due to the introduction of new principles and evaluation criteria, it is necessary to regularly update the Waste Management Plan at the state and regional level, according to the Waste Act No. 541/2020 Coll. When creating new strategic documents, emphasis should be placed on the use of available computing tools, inter-regional cooperation and the specific formulation of goals and measures. The individual goals of waste management must be taken into account when operating existing facilities and also when planning the necessary infrastructure. The attention in this text is devoted to the analysis of the current state of waste management in the Liberec Region with a focus on key technologies. The mentioned approaches and recommendations can be further applied to any region of the Czech Republic.
|
|
|
Possibilities of Zn Recovery from Waste Incineration Fly Ashes.
Korotenko, Ekaterina ; Šyc, Michal ; Jadrný, J. ; Mašín, J. ; Krystyník, Pavel ; Klusoň, Petr
Modern economy is characterized by unprecedented increase in the consumption of raw materials and products. Heavy metals represent only 10% of all inorganic goods consumed, but due to their specific physical and chemical properties they are extremely important in everyday life. Zinc is the world's 4th most widely used metal. Due to the reduction of easily accessible natural resources and the growing shortage ofZn, it is necessary to find secondary raw materials and methods to recover metal from them. Fly ash from municipal solid waste incinerators (MSWI) is a suitable raw material for Zn recovery, because of the production quantity and the same content of Zn as in poor ore. Thereby, this paper is aimed to the recovery of Zn from fly ash on the real scale from data obtained from MSWI in the Czech Republic. Verification of the possibility of Zn recovery from fly ash through acid extraction with flue gas treatment system scrubber liquid has been carried out. The results were compared with the published results of Zn recovery using the Swiss technology FLUWA/FLUREC and the Swedish HALOSEP. The average efficiency of Zn extraction in the real MSWI is close to 60%, which is comparable to the efficiency of the technologies mentioned above. Other benefits of acid extraction are above all the neutralization of two hazardous waste streams from the MSWI (fly ash and scrubber liquid), the reduction of chemicals consumption and the total costs for treatment of fly ash and scrubber liquid, production of stabilized inorganic residues and shifting the process in the waste management hierarchy from landfilling towards metals recovery.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22019040814151 - PDF
|
|
|
Removal of Toxic Metals from Contaminated Water by Elektrocoagulation Method.
Mašín, P. ; Krystyník, Pavel ; Klusoň, Petr ; Jadrný, J. ; Krušinová, Z. ; Kroužek, J.
This paper is focused on a pilot scale electrocoagulation method for heavy toxic metal removal from contaminated ground water and waste water. High efficiency, over 99 % removal of ions Cr6+ and Ni2+ (after arise pH to value 9) has been achieved, during treatment groundwater with content 40 respectively 90 mg/l of chromium and nickel. Mainly disadvantage this technology was coating of electrode plate with ferrous oxides or hydroxides and decreasing of heavy metal removal. It was necessary performed periodical flushing with water and regeneration electrode plates helpful solution of H3P04. Following application of electrocoagulation was performed in wastewater produced from leaking of fly ash from incineration plant of municipal waste. Electrocoagulation process was very effective for reducing of Zn and Pb, but decrease of content Cd was only 20 %. It was found, that Cd must be coprecipitated with Na2S and other alternatives are not effective. Thus, for this electrocoagulation technology was found appropriate utilization for effectively reduce of Zn content.\n
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22019040408010 - PDF
|
|
|
Determination of the potential of process waters for metals recycling
Struňáková, Katarína ; Krystyník, Pavel (advisor) ; Jadrný, Josef (referee)
Incineration of municipal waste in incineration plants leads towards formation of many by- products, such as slug or fly ash. These by-products may contain specific amount of heavy metals. Acidic leaching enables to transfer of some of those metals into liquid phase from which they can be obtained by various methods, i.e. by electrodeposition.. This bachelor thesis is focused on the description of waste incineration process and treatment of solid residual which can potentially be used as a secondary raw material. Incineration plant with a capacity of 96 000 t/year simultaneously treats 27 t of Zinc annually. The economic value of this treated Zinc is about 1 700 000 CZK. In case of 80 % acidic extraction efficiency the price of treated Zinc is still more than 1 400 000 CZK. Thus there is a possibility of Zinc utilization as a secondary raw material.
|
|
| |
|
|
Flexible forms of work in the Czech Republic and Switzerland
Jadrný, Jan ; Kotýnková, Magdalena (advisor) ; Vebrová, Ludmila (referee)
The aim of the thesis is to study and compare flexible forms of work in the Czech Republic and Switzerland from 2005 to 2014. The theoretical part defines basic terms of the labor market, major transformations of the current labor market and labor legislation of the Czech Republic and Switzerland. Comparative and factorial analysis are used in the practical part to analyse basic indicators and flexible forms of work of in the Czech and Swiss labor market. The analysis is then set in the broader context of microeconomic and macroeconomic conditions and educational systems in the Czech Republic and Switzerland. The main differences between Swiss and Czech flexibility of the labor market and the typical worker employed under flexible employment in the Czech Republic and Switzerland are drawn from the performed analysis.
|
guest ::
RSS feed.