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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
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Advanced Treatment Methods for Incineration Bottom Ash.
Šyc, Michal ; Baloch, T. ; Veselý, Václav ; Zuda, M.
Bottom ash is main solid residue from waste-to-energy. Recent development and trends change the approach to IBA, it is no longer regarded as unwanted waste from WtE plant but can be considered a valuable secondary source for several materials like ferrous and non-ferrous metals. Mineral residue after metal separation can be used in construction industry, e.g. as aggregates substitute for bound or unbound applications such as subbase layer for road construction. The paper summarizes results of recent activities for bottom ash utilization in WtE plant in Prague within last few years.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22019040810070 - PDF
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Biochar Preparation in Quality of Activated Carbon via Pyrolysis of Hemp Waste
Šrámek, V. ; Staf, M. ; Pohořelý, Michael
The paper describes the preparation of adsorbents with the properties of activated carbon from biomass waste. Prime feedstock are hemp stems and a referential material is hardwood. The preparation is divided in two phases. The first phase includes pyrolysis in the temperature range 450-850 °C in the horizontal furnace and in the second phase the pyrolysed material is activated with steam and carbon dioxide in a vertical reactor. Finally, biochar was analyzed and relevant properties including BET surface and pore size distribution were determined to appoint suitable operational conditions for the biochar production in quality of activated carbon.\n
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22019040809400 - PDF
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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
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Use of Sodium Bicarbonate for Flue Gas Treatment in Small Scale.
Zach, Boleslav ; Pohořelý, Michael ; Šyc, Michal ; Svoboda, Karel ; Václavková, Šárka ; Moško, Jaroslav ; Brynda, Jiří ; Punčochář, Miroslav
The trend of reduction of landfilling can lead, especially in areas with low population density, to the need to build new waste-to-energy capacities in the form of small units. However, flue gas treatment in small scale has to be sufficiently simple to decrease capital costs and allow the construction of such facilities. For that reason, the possibility of one-step dry flue gas treatment at compromise conditions was investigated as well as the limitation of flue gas composition.\n\n
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