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Polish Journal of Chemical Technology (v.10, #4)
Photocatalytic hydrogen generation over alkali niobates in the presence of organic compounds by Beata Zielińska; Joanna Sreńscek-Nazzal; Ryszard J. Kaleńczuk; (pp. 1-3).
Keywords: Hydrogen generation; alkali niobates; photocatalysis
Vanadium pentoxide application for the synthesis of NaVO3 in the presence of oxygen by Katarzyna Białowicz; Mieczysław Trypuć; Krzysztof Mazurek; Urszula Kiełkowska; (pp. 4-6).
Keywords: environment; synthesis; parameter identification; unit operations; sodium metavanadate
Precipitation of calcium carbonate in the presence of urea at 293K by Katarzyna Białowicz; Urszula Kiełkowska; Mieczysław Trypuć; (pp. 7-10).
Keywords: calcium carbonate; waste distillation liquor (DS); sodium bicarbonate; urea; bulk density; packing density
Plotting of the solubility isotherm for the NH4NO3 + NaVO3 + H2O system by Mieczysław Trypuć; Sebastian Drużyński; Krzysztof Mazurek; (pp. 11-14).
Keywords: SCS method; equilibrium investigation; double exchange; ammonium nitrate(V); ammonium vanadate(V)
Evaluation of waters environment hazard by pulp-mill liquors by Aleksandra Lewkiewicz-Małysa; Elżbieta Konopka; (pp. 15-19).
Keywords: chemical paper-pulp; pulp-mill waste; BAT; self-cleaning of waters
Purification of sphalerite concentrate in the chemical and flotation way by Andrzej Jarosiński; (pp. 20-24).
Keywords: zinc concentrates; magnesium removal; chemical treatment and flotation
The influence of urea on the K2CO3 and NH4VO3 solubility in the K2CO3 + NH4VO3 + H2O system by Urszula Kiełkowska; (pp. 25-27).
Keywords: solubility; density; equilibrium; ammonium vanadate(V); potassium carbonate; urea; water
Principles of municipal waste management in Poland and selected regions of Europe by Joanna Kulczycka; Zygmunt Kowalski; (pp. 28-33).
Keywords: municipal waste management; recycling; landfilling
The influence of leaching solution pH and addition of peroxide hydrogen on the recovery of some components from the used vanadium catalyst with urea solutions by Krzysztof Mazurek; Mieczysław Trypuć; Katarzyna Białowicz; Sebastian Drużyński; (pp. 34-36).
Keywords: sulfuric acid; sulfur oxide; urea solutions; used vanadium catalysts; leaching process
Assesment of the usability of Mg(OH)2 obtained from the solution after sphalerite leaching for the winning of polyetylene composition by Kinga Pielichowska; Sylwester Żelazny; (pp. 37-39).
Keywords: Magnesium hydroxide; polyethylene
Recovery of aluminium from multi-component packaging using a fluidised bed reactor by Witold Żukowski; Jerzy Baron; Jadwiga Zabagło; Stanisław Kandefer; Małgorzata Olek; (pp. 40-44).
Keywords: fluidisation; combustion; multilayer packaging; thermal energy; recovery of aluminium
Reduction of carbon dioxide emission through the sorption in situ using a fluidised bed reactor by Witold Żukowski; Sylwia Englot; Jerzy Baron; Stanisław Kandefer; Małgorzata Olek; (pp. 45-48).
The paper discusses the possibility of using the reversible reaction CaCO3 ↔ CaO + CO2 for the cyclic capture and release of CO2 directly inside a fluidised bed combustor. This could lead to the lowering of CO2 emissions into the atmosphere, as part of an effort to mitigate the greenhouse effect associated with the rising atmospheric CO2 concentrations resulting from obtaining energy from burning fossil fuels.
An enrichment coefficient E has been introduced and defined as a measure of the production of CO2 (on calcining CaCO3) or its removal (on carbonation of CaO) with respect to the level associated with fuel combustion alone. The observations made on the effect of introducing an additional external stream of CO2 on the efficiency of the chemical capture process have been described. Through an appropriate control of the temperature inside the reactor it is possible to change the value of E over the range [-0.8; 0.8]. This implies that up to about 80% of the CO2 derived from the fuel can be temporarily retained within the bed and released later, at a higher concentration. The proposed method of burning fuel in a chemically active fluidised bed could be an available method leading to CO2 isolation from the flue gases and leading to its eventual sequestration.
Keywords: fluidisation; combustion; CO2 sequestration
Long-term interaction of coal combustion by-product with water by Maria Żygadło; Magdalena Woźniak; (pp. 49-52).
A terrestrial disposal of the fly ash has been regarded as a potential source of contamination due to the enrichment and surface association of trace elements in ash particles. In laboratory conditions the leaching of soluble components existing in ashes proceeds in a different way than in land deposits.
On the landfill site coal combustion by-products are under the pressure of atmosphere agents, especially water, sun and rain activity (drying and wetting alternately), freeze/thaw (in cold climate) and gases included in the air. Also the time of exposition is an important parameter.
In the presented experiment the observed dynamics of ash solubility over a long period of time provides the evidence that in the ash-water system, a variety of precipitation processes dominate the solubility of solid mass. Simulating the weathering by the freeze/thaw test approximates the effectuated changes in ash particles structure.
The leaching of a particular ash component depends on reactions in the ash-water systems.
Solidification by compaction of the material is often favoured because of the cementitious properties of ashes being in contact with water. Secondary hydrated minerals such as ettringite, portlandite and calcite are formed during a contact with water. Calcium -silicate hydrates, aluminate-hydrates and gypsum can occur as secondary minerals. The solubility of such new phases and the solidification process determine the leaching characteristics of the ash mass.
Keywords: coal combustion by-products solubility; leachates from ash landfills; waste recycling
Investigations of hydrogen bonding in the poly(urethane-urea)-based membrane materials by using FTIR spectroscopy by Aleksandra Wolińska-Grabczyk; Bożena Kaczmarczyk; Andrzej Jankowski; (pp. 53-56).
Keywords: Infrared spectroscopy; hydrogen bonding; polyurethanes