National Repository of Grey Literature 62 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Effect of particle size of high-temperature biochar on its properties
Sedmihradská, Anežka ; Skoblia, S. ; Beňo, Z. ; Moško, Jaroslav ; Fajgar, Radek ; Soukup, Karel ; Pohořelý, Michael
High-temperature biochar is an increasingly used soil amendment, especially in areas where the physical properties of the soil need to be improved. This ecologically promising material has so far been studied mainly in relation to production temperature or the input material. The effects of particle size on the properties of biochar have so far been studied insufficiently. This work seeks to expand the knowledge in this particular area. \n
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Comparison of properties of biochars based on different types of sewage sludge.
Moško, Jaroslav ; Beňo, Z. ; Hušek, Matěj ; Komárek, M. ; Vítková, M. ; Pohořelý, Michael
The application of sewage sludge to agricultural land is an increasingly debated topic, particularly because of the precautionary principle regarding the content of inorganic, organic and microbial pollutants. One of the practices treatment/treatment of sludge prior to land application is pyrolysis, whereby \nbiochars are produced from the sewage sludge, which, provided that proper process management, stable and free from organic and microbial \ncontamination. The aim of this paper was to verify the properties of biochars from sewage sludge that were subjected to different types of stabilization. The sludges were pyrolyzed at temperatures ranging from 600 to 650 °C and a certain correlation was found between degree of sludge stabilization and biochar properties (textural properties, elemental composition, energy value). \n\n
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Production and characterization of high-temperature biochar.
Sedmihradská, Anežka ; Skoblia, S. ; Beňo, Z. ; Moško, Jaroslav ; Pohořelý, Michael
Thermochemical conversion of biomass produces solid residue that is further used in agriculture called biochar. Studied biochar was produced in twin-fire two-staged gasifier from waste wood biomass. Heat and electricity were produced together with biochar. Biochar samples were analysed and assessed as a soil amendment. Results were compared to legal standards and voluntary certificate limits. It was concluded that studied biochar meet all criteria for utilization as a soil amendment.
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Influence of sorbent type on dehalogenation of reducing gas without condensing fraction.
Šrámek, Vít ; Skoblia, S. ; Staf, M. ; Beňo, Z. ; Pohořelý, Michael
Chemical recycling of plastics is one of possible option to process large amount of currently difficultly recycled plastic waste. It would be possible to fulfil goals of the amount of recycled waste by means of chemical recycling. Principle of chemical recycling is conversion of plastic waste to basic hydrocarbon substance that could be used in refineries or petrochemical industry. The main technological challenge is the presence of halogens in plastic waste (in plastics as substances containing chlorine in form of PVC or brome in form of additives/flame retardants). During chemical recycling via pyrolysis, these substances can transfer to products and cause problems in succeeding technologies (corrosion, poisoning of catalysts etc.). One of the solutions how to eliminate these unwanted substances could be high temperature sorption of primal pyrolysis gas on sorbents before its condensation. Experiments with model gas containing halogenated compounds and different inorganic sorbents were conducted for this purpose. Gained results allowed us to narrow down the amount of sorbents suitable for high temperature removal of halogenated compounds from primal pyrolysis gas produced during pyrolysis of plastics.
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Experimental methodology for studying the behaviour of perfluoroalkyl compounds during sewage sludge pyrolysis
Hušek, Matěj ; Skoblia, S. ; Moško, Jaroslav ; Beňo, Z. ; Semerád, Jaroslav ; Cajthaml, Tomáš ; Pohořelý, Michael
One of the waste management options of stabilised sewage sludge is its treatment by pyrolysis. Pyrolysis units are suitable for sewage sludge treatment with low-heavy metal content, but their suitability for various organic pollutants removal contained in sludge is under investigation. In this paper, we discuss the issue of per- and polyfluoroalkyl substances (PFASs) (organic pollutants) in sewage sludge and the development of a methodology for the experimental determination of PFASs behaviour during sewage sludge pyrolysis in order to determine practical pyrolysis conditions for the treatment of sewage sludge containing PFASs.\n\n
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Laboratory Pyrolysis Experiments of Pelleted Digestate (PS) and Extracted Sunflower Scrap (ES).
Pohořelý, Michael ; Skoblia, S. ; Beňo, Z. ; Hartman, Miloslav
In the report, there are results of laboratory pyrolysis analysis of pelleted digestate and extracted sunflower scrap.\n
Utilization of waste from processing of industrial hemp for production of carbonaceous adsorbents.
Šrámek, V. ; Staf, M. ; Pohořelý, Michael ; Beňo, Z.
Utilization of waste biomass for production of carbonaceous adsorbents would be a suitable substitution of comercially available activated carbon. This work focuses on a two step preparation in two separate apparatus of own construction operated at UCT Prague. The first step involves pyrolysis of the hemp hurd at temperature range 450–850 °C and the second step is based on activation of the pyrolysis residue via steam at temperatures 740 and 800 °C. The prepared activated material was examined for key sorption parameters: specific surface are by BET equation, total specific pore volume and pore size distribution. The results were compared to comercially available activated carbon produced also via the steam activation.
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Influence of pyrolysis temperature on the quality of biochar.
Sedmihradská, Anežka ; Pohořelý, Michael ; Skoblia, S. ; Beňo, Z. ; Farták, J.
Biochar is a solid residue from biomass carbonization processes that ca be further used in agriculture. Parameters influencing quality of biochar are pyrolysis temperature, heating rate, residence time, type of the reactor and type of feed biomass. This work addresses the influence of pyrolysis temperature.
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Laboratory Pyrolysis Experiments of Pelleted Sunflower Harvesting Residues and Grain Harvesting Residues.
Pohořelý, Michael ; Skoblia, S. ; Beňo, Z. ; Hartman, Miloslav
In the report there are results of laboratory pyrolysis analysis of pelleted sunflower harvesting residues and grain harvesting residues.
Laboratory Pyrolysis Experiments of Barley and Wheat Pelletized Straw Samples, Sludge and Biomass Pellet Samples.
Pohořelý, Michael ; Skoblia, S. ; Beňo, Z. ; Hartman, Miloslav
In the report there are results of laboratory pyrolysis analysis of barley and wheat pelletized straw samples and sludge and biomass pellet samples.

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