1,721,050 research outputs found
“Control of emissions of metallic mercury from MSW incineration by adsorption on SorbalitTM”
No full text“Adsorption and desorption of elemental mercury vapors on silver nitrate impregnated carbon”
No full text"Fly ash capture of mercuric chloride vapors from exhaust combustion gas”
No full textEmissions of mercuric chloride from incineration of
Municipal Solid Waste (MSW) constitute a severe
environmental problem. Recent studies of the emissions
from MSW incinerators indicate that, when fabric filters are
used, fly ash may promote Hg emission control. In this
investigation, a laboratory-scale apparatus was used to
evaluate HgCl 2 adsorption on MSW fly ash. A mixture of
N 2 and HgCl 2 was used as gas phase, with HgCl 2
concentration varying between 0.5 and 10 mg/m 3 . Fly ash
samples collected, on the fabric filter of an industrial
size MSW incinerator, were tested to understand the
mechanisms involved in mercury fly ash sorption. The
experiments led to the determination of the breakthrough
curves for the fixed bed and of the adsorption isotherms
at different temperatures in the range of 150 - 250 ° C. The
adsorption isotherms, which have a characteristic
“Langmuir” shape, were used to evaluate the Langmuir
parameters at the temperatures investigated and the heat
of adsorption for the phenomenon
"Ossidazione del bisolfito di calcio nel processo di desolforazione a umido dei fumi della combustione"
No full text"Sulfite oxidation catalyzed by cobalt ions in flue gas desulfurization processes"
No full textThis paper presents an experimental study of calcium bisulfite oxidation, a key step in the wet limestone-gypsum flue gas desulfurization (FGD) process, in the presence of catalysts (e.g., cobalt ions and a mixture of ferrous and cobalt ions). A fundamental approach is followed, by reproducing a simplified synthetic FGD liquor in which both catalyst ions, alone or mixed together, are present. A laboratory-scale apparatus is used, in which sulfurous solution is contacted with a gas phase at a fixed oxygen partial pressure (21.3 kPa) and at different temperature levels (25, 45, and 55 °C). The experimental results are analyzed using the theory of gas-liquid mass transfer with chemical reaction, showing that the slow reaction regime is explored and the transition from the kinetic to the diffusional subregime is identified. The experimental results are compared with those obtained in the presence of other catalytic species (manganese and ferrous ions), showing that cobalt is effective in catalyzing the oxidation of calcium bisulfite to sulfate, but to a minor extent with respect to iron and manganese
"Adsorption of elemental mercury vapors in the presence of oxygen onto activated carbon"
No full textKinetics of adsorption of mercuric chloride vapors on sulfur impregnated activated carbon.
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