Frantisek Kastanek

Frantisek Kastanek
The Czech Academy of Sciences | AVCR · Institute of Chemical Process Fundamentals

Prof., PhD, Ing.

About

568
Publications
8,073
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1,138
Citations
Citations since 2017
13 Research Items
327 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060

Publications

Publications (568)
Article
Full-text available
The poultry meat industry generates about 60 million tons of waste annually. However, such waste can serve as a cheap material source for sustainable liquid fertilizers or biostimulant production. Moreover, its practical potential associated with the circular economy is evident. One of the options for waste feather reprocessing is to use a hydrolys...
Article
Full-text available
This study is devoted to the scale-up potential of TiO2/UV photocatalyst for real wastewater treatment including its durability tests. The activity of the prepared TiO2 layers was first tested in a laboratory reactor on key representative pollutants diclofenac, chloramphenicol and triclosan. A special pilot plant reactor of a two-tube system with 2...
Article
Full-text available
The freshwater green microalgae, Dictyosphaerium chlorelloides (CCALA 330), has the ability to produce extracellular polysaccharides (EPS). Conditions for optimum growth and EPS overproduction were determined in laboratory-scale tubular photobioreactors (PBR) with a working volume of 300 mL. Multiple limitations in nutrient supply were proven to be...
Article
Full-text available
The article deals with simple methods of decontamination of groundwater from the vicinity of brownfields contaminated with organic and inorganic substances. In the literature, thousands of articles on this issue at various sophisticated levels of knowledge can be found. The articles are mostly suitable as an extension of scientific knowledge; howev...
Article
Full-text available
Background A giant amount of poultry waste represents one of the threats to the environment, or conversely, a significant source of peptides and other substances in demand. A rational use of huge quantities of poultry waste, especially after industrial chicken processing, is one of the pillars of biorefinery of livestocks wastes. Introduction Six...
Article
Full-text available
In this study, we report for the first time a novel type of sorbent that can be used for mercury adsorption from the air-based off-gasses-vermiculite impregnated with alkali polysulfides and thiosulfates. In contrast to other sorbents, vermiculite exhibits superior thermal stability in air and low adsorption capacity for organic vapors. This allows...
Article
Full-text available
Degradation of three different endocrine disruptors (EDs) was thoroughly studied on prepared durable thin layers of titanium dioxide with an anatase crystalline structure. Specially constructed laboratory reactors bringing information on all individual processes (photolysis, photocatalysis, sorption) involved in decomposition of the studied EDs (17...
Article
The solar driven photo-electrolysis of water for hydrogen and nanoparticles formation from electrolyte with corresponding metal salts was investigated. The photoanode consisted of a thin layer of silicon nanowires deposited on molybdenum and a platinum wire as the cathode was used. The prepared photo-anodes were stable up to 0.3 V against the satur...
Article
The method of germanium and silicon regeneration from waste germanium lenses and photovoltaic cells was success-fully verified. Preparation of magnesium germanide, magnesium silicide and their mixtures in an optimized semi-opened reactor was investigated in details. Obtained products were characterized by dispersive Raman spectroscopy, Scanning Ele...
Article
Full-text available
Bioaccumulation of rubidium (Rb⁺) and lithium (Li⁺) from alkaline wastewater containing 480 mg L⁻¹ Rb⁺ and 540 mg L⁻¹ Li⁺, a by-product of zinnwaldite processing, was studied at laboratory scale using growing freshwater microalgae (Chlorella vulgaris, Desmodesmus quadricauda and Scenedesmus obliquus). Bioaccumulation of Li⁺ was very low, while the...
Article
: Circulation technology of waste photovoltaic panels for production of ultrapure silicon and energy in the form of hydrogen storage was designed and verified. Preparation of magnesium silicide from waste photovoltaic panel’s sili-con and partially oxidized magnesium was thoroughly studied. Work was focused on process optimization, thus, three grou...
Article
Prevention of energy transformer failures by removing so-called “corrosive sulfur” from insulating oil belongs to the most important tasks. This article is focused on finding a low-cost effective way suitable for decontamination of mineral insulating oils containing sulfur compounds together with regeneration of the insulating oils. Two methods wer...
Article
Degradation of decabromodiphenyl ether (BDE209) dissolved in n-hexane and in the mixture of n-hexane with water and microglass beads using microwave assisted photoreaction was examined. A novel electrodeless discharge lamp coated with titania oxide (anatase) and placed in a microwave field directly in a bulk of suspension was used to generate UV/Vi...
Article
Owing to that in situ remediation of contaminated sites by thermal desorption is a widely accepted technology that provides a permanent solution at an economically competitive cost thermal desorption of various model contaminants was tested at a bench-scale. Polyaromatic hydrocarbons (benzene/toluene/xylene) and non-polar extractable compounds were...
Article
Full-text available
Degradation of endocrine disruptors on an immobilized titanium dioxide photocatalyst in the presence of UV light was tested on a specially designed plug-flow reactor. The active part of this pilot plant reactor with the inner free volume of 3.5 L consisted of stainless steel annulets coated by titanium dioxide thin layers in a zigzag arrangement. T...
Article
Full-text available
Microalgae have increasingly gained research interest as a source of lipids for biodiesel production. The wet way processing of harvested microalgae was suggested and evaluated with respect to the possible environmental impacts and production costs. This study is focused on the three key steps of the suggested process: flocculation, water recycling...
Article
Full-text available
A sorption technique was tested for decontamination of post-processing underground coal gasification (UCG) water contaminated by a variety of organic and inorganic substances. Four sorbents (two zeolites and two activated carbons) with nanoiron were chosen for laboratory and pilot sorption experiments. Four main phenol contaminants typical for UCG...
Article
Full-text available
Combined thermal desorption and catalytic oxidation for soil decontamination was studied at the pilot plant scale. Gasoline, xylene, and 2-methylnaphthalene were used as model contaminants in the concentrations from 2 g to 10 g per kg of soil. To guarantee the flow of the exhaust gas from the thermal desorption unit into the catalytic oxidation uni...
Chapter
Mixtures of indigenous soil bacteria were applied to remediate local ground waters and soil polluted with petroleum derived substances. Implementation of three months of remediation protocols resulted in a decline in the amount of petroleum derived contaminants from an initial concentration of 1-10 g.kg-1 soil dry weight to an average of 0.25 g.kg-...
Article
Full-text available
Laboratory-scale experiments were performed in order to examine the effect of microwave field on the effectiveness of KPEG method (nucleophilic substitution of the chlorine atoms in a molecule of PCBs by alkaline polyethylene glycol PEG) in the removal of PCBs from highly contaminated mineral oils with the content of indicator congeners (No 28,52,1...
Article
Full-text available
A complex treatment of agricultural waste including the following major steps: anaerobic fermentation of suitable waste, cogeneration of the obtained biogas and growth of microalgae consuming the CO(2) from biogas and flue gas was verified under field conditions in a pilot-scale photobioreactor. The growth kinetics of microalgae Chlorella sp. consu...
Article
Full-text available
The aim of the study was the experimental verification of a proposed novel technology of energy and materials production, consisting of the following process steps: production of biogas from agricultural waste (distillery stillage), presumed utilization of biogas for electricity and heat production (cogeneration) in association with its use as a so...
Article
The effect of microwave (MW) field on the rate of thermal desorption of polychlorinated biphenyls (PCBs) from long-term contaminated soil was examined in the laboratory environment. For these purposes a modified MW oven was used, with a uniformly extended MW field and a power consumption of 200-600 W. The weight of the soil samples was 100 g, the s...
Article
This paper deals with the development and application of two methods for the de-contamination of waste and underground water polluted by a variety of hazardous halogenated organic substances, namely polychlorinated biphenyls, chlorophenols, perchlorates and especially their decomposition products dichloroethanes and vinyl chloride, and potentially...
Article
Full-text available
The method of decomposition of chlorinated organic substances in contaminated water based upon successive steps of chemical pretreatment of organic compound with a) active radicals (Fenton reaction) and/or with b) reductive dehalogenation on metallic Pd in the presence of zero-valent iron, followed by aerobic biodegradation using bacteria strain Pa...
Article
An application of findings and methods of chemical engineering to improvement of chemical process safety and loss prevention is discussed. Current trends in chemical engineering are discussed with respect to a challenge for chemical engineers in an effort to improve chemical process safety. The characteristics and the state of the art in the Czech...
Article
This project has focused on the development of a complex assembly of mutually corresponding technological units: a low temperature thermal process for the desorption of PCBs and other organics from soils and other contaminated solid wastes; the extraction of PCBs from soils by an ecological friendly aqueous solution of selected surfactants; the che...
Article
Blended Portland cements have so far been produced with an admixture of slag, fly ash and other ingredients. The present paper surveys the results of the investigation into the properties of a new type of blended Portland cement containing waste steel foundry dust as admixture. The optimum way of preparation of this type of cement consists in the s...
Article
Full-text available
Wastewater contaminated by PCBs obtained from three different sources was treated at both laboratory and pilot plant scale conditions by ultraviolet oxidation of organics at the presence of hydrogen peroxide after partial adsorption of impurities and PCBs on activated carbon and/or activated bentonite. The procedure was conducted both with and with...
Article
This paper deals with the development and application of the technologies for the de-contamination of soils polluted by organic substances, namely polychlorinated-biphenyls (PCB). The results from the operation of the semi-pilot and large-scale units aimed at the disposal (elimination) of PCB are reported in soils and solid waste by a thermal de-so...
Article
Full-text available
Properties of mixtures of Portland cements and "waste steel foundry dust (WSFD)" from Czech steel works were examined. It was found that WSFDs are formed by microporous clusters of spherical particles of iron oxides, ranging in size from 10 to 100 nm. The content of ZnO in WSFD affects markedly the hydration of cement + WSFD mixtures both in solidi...
Article
2., přeprac. vyd. 15000 výt. Il. tit. dvoulist Obálka a vazba: Zdenek Seydl Humoristický román s fantastickými prvky (vyšel poprvé r. 1929) je společenskou, náboženskou a politickou satirou, jež přibližuje ovzduší vzniku naší republikánské společnosti. Pětadvacetiletý obchodní příručí objeví v soběokultníschopnost být původcem zmaterializovaných př...
Article
Three sites with a long history of contamination with polychlorinated biphenyls (PCBs) or chlorinated ethenes (CIUs) were investigated to evaluate the natural attenuation process. Data showed that both the rates and mechanisms of biodegradation differed and that the occurrence of aerobic and anaerobic microorganisms differed qualitatively and quant...
Article
Motion of a single macroscopic particle in a liquid flowing through a narrow channel with slightly non-parallel walls is studied by a visualization method. The experiment is limited to the region of slight inertia effects, Ar < 500. Three kinematic characteristics of the particle motion in the channel, viz. settling velocity in a still liquid, as w...
Article
The effect of ejector configuration on the energetic efficiency of gas-liquid contacting and on the efficiency of gas-phase utilization was examined in the two alternative operating modes of ejector-distributor reactors, i.e. under conditions of free suction or forced gas supply to the ejector. Data for the free suction regime proved the independen...
Article
The purpose of the present work was to examine the effect of design and working parameters of bubble column reactors on the formation and stability of the homogeneous and the heterogeneous bubbling regimes and to demonstrate the effect of bubbling regime transition on the hydrodynamic and mass transfer characteristics of gas-liquid beds in bubble c...
Article
Tensiometers and blocks are in common use to measure soil water suction. The working range of tensiometers is only 0.7 to 0.8 bar. To measure higher values of soil water tensions psychrometric methods are applicable, but for tensions more than 0.7 to 0.8 bar only block methods may be used. Some sources of errors may restrict the accuracy to measure...
Article
The combination of sorption procedures and biodegradation of PCB-contaminated ground water is presented. The efficiency of PCB removal in the laboratory and pilot-scale technology is compared. Physical procedures dures used were: sorption on bentonite, active carbon, carbon fibre tissue and polymers D1V1, CME and Ostion. Biodegradation was carried...
Article
The deposition of fine silica and polystyrene spheres was measured for conditions of laminar and turbulent flow (960 ≤ Re ≤ 16040) in a rectangular channel using image analysis. The plate glass deposition surfaces were rendered positively charged by coating them with a cationic copolymer while, under the water chemistry conditions employed, both ty...
Article
The coalescence behavior of bubbles in aqueous electrolyte solutions with the character of gas-liquid beds generated in bubble column reactors and with corresponding values of bubble bed voidage was linked. The experimental program included determination of the bubble coalescence frequency in a coalescence cell and measurement of gas holdup in a si...
Chapter
The contamination of soils and groundwater caused by the operation of army vehicles by the former Soviet Army (SA) can be considered a typical example of wide-spread, multiple point-source pollution. It has been shown that mixed populations of autochthonous microbes are particularly suited for the remediation of soil and groundwater. In fact, petro...
Article
The article compares experimental results of the effectiveness of the extraction of heavy metals contained in mixed microbial cultures forming activated sediments from communal sewage disposal plants. The methods used were elimination of the metals from the sediments based on their extraction with strong inorganic acids under pH 1, extraction with...
Article
The effect of selected construction and operating variables (number of column stages, distributing plate geometry, gas and liquid flow rates, and solid phase concentration) on hydrodynamic and mass transfer characteristics of multi-stage three-phase slurry reactors was studied in a countercurrent-flow bubble column reactor 0.29 m in diameter, secti...
Article
The presence of small particles with adsorbing activity (carbon soot, active carbon etc.) in the bubble bed augments the gas-liquid mass transfer coefficient k L a about approximately 20% in comparison with pure liquid. This fact can be explained by penetrating and disturbance effect of particles into the boundary layer of liquid near the interface...
Article
The gas phase holdup, the specific interfacial area a , and the liquid-side volumetric mass transfer coefficient k L a have been determined for two selected binary systems water-butanol and butanol-2-ethylhexanol in a short bubble column of 150 mm i.d. at gas phase velocities (air) in the range of u G = (0.31-2.52) . 10 ⁻² m s ⁻¹ . The k L a - u G...
Article
The effect of liquid phase properties on gas holdup in bubble column reactors was investigated within a large set of gas-liquid systems. Air was used as a gaseous phase in all experiments, liquid phases included distilled water and aqueous solutions of alcohols and electrolytes. Gas holdup values were determined in a sieve tray bubble column 0.15 m...
Article
A method is developed to simulate seepage immediately after lowering the water level of a ditch taking into account the capillary fringe above the groundwater level. It is a trial and error method using conductive sheet analogue models. The results obtained are fundamental data for the confirmation of other models using digital computers, which are...
Article
Cultivation of the yeast Candida utilis on spent sulfite liquors was studied using tower fermentors with forced medium circulation. The studied types include an upflow fermentor, a downflow fermentor, and a downflow internal-loop apparatus. Venturi-tube ejectors were used in all cases for the distribution of gas. It was the aim of the work to test...
Article
Hydrogenation of rape-seed oil catalyzed by a commercial heterogeneous catalyst Ni/kieselguhr was studied. It has been established that the rate of hydrogenation increases significantly with the increasing interphase area value and with pressure. The hydrogenation selectivity is worsened in the through-flow arrangement; several reactors must be con...
Article
An approximate model is proposed for ozone absorption, based on the concept of molecular diffusion of dissolved ozone through a liquid film, accompanied by simultaneous reactions of ozone decomposition and its reaction with some characteristic contaminating component, and under conditions of nonzero ozone concentration in the bulk of the stirred li...
Article
The research program was devoted to the vertical upward directed air-water flow in tubes with swirl bodies at their inlet part. The operation parameters of the stream tube were w OVER BAR //g equals 10. . . 35 m multiplied by (times) s** minus **1 and V//L//E equals (3. 6. . . 22. 2) multiplied by (times) 10** minus **3 m**3 multiplied by (times) m...
Article
The absorption of oxygen from air into water has been measured in vertical tubes with swirl bodies in the inlet part. The tubes were of 70 mm I.D. and of height H with diameter ratio H/D ≦ 22. The two-phase flow was directed upward. Superficial gas velocity was ωG = 10 to 35 m s⁻¹ and specific liquid load QLE = 13 to 80 m³m⁻²h⁻¹. Values of the liqu...
Article
1. vyd. Obálka a vazba Zdeněk Ziegler 36500 výt.
Article
This work is aimed at the evaluation of mass transfer intensity and energetic performance of two types of reactors studied for longer time i. e. of the sieve-tray bubble column reactors and tower reactors with forced liquid-phase circulation using ejectors (Venturi-tube type) as gas distributors. There were two main objectives of the reported work:...
Article
Condirions of stable, uniform gas distribution were studied in bubble-type reactors with sieve plates and the effect of geometric parameters of distributing plates and physical properties of liquid phase on the character of the uniformly bubbled bed and on its porosity was considered. Critical velocity in the holes of the plate corresponding to the...
Article
The effect of ejector-nozzle geometry on gas holdup and on the rate of interfacial mass transfer characterized by values of kLa was studied in a tower reactor with ejector-type gas distributor. It has been established that both gas holdup and kLa values are, in contactors of this type, unambiguously determined by the rate of energy dissipation in t...
Article
Calculation procedure is suggested for flow intensity of substrate toward reaction interface of immobilized enzyme at simultaneous effect of enzymatic reaction and internal diffusion. The approximate model is presented in an analytical form for the basic type of Michaelis-Menten kinetics and for the case of inhibition in excess of substrate.
Article
Characteristic hydrodynamic parameters of three selected types of bubble-type column reactors with forced liquid circulation were studied experimentally. Application of these units for the fermentation process - production of fodder protein by continuous cultivation of Candida utilis yeast on the synthetic ethanol was tested. Two modifications of t...
Article
A simple method is suggested for the modelling of hydrodynamics of reacting gas-liquid systems in large-scale bubble column reactors. Values of liquid-side mass transfer coefficient (kL), interfacial area (a), and gas holdup ratio (e) in a large-scale apparatus can be predicted on the basis of experimental gas holdup data obtained for the reacting...