caa a22 4500 60616927X CHVBK 20210128100711.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s10098-015-0908-y doi (NATIONALLICENCE)springer-10.1007/s10098-015-0908-y Ferrero Franco Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy aut Dye removal from aqueous solution using coal fly ash for continuous flow adsorption [Elektronische Daten] [Franco Ferrero] Coal fly ash was characterized at first in batch adsorption with acid and basic dyes. Good results of removal were obtained, although strongly dependent on initial dye concentration, ash dosage, and above all on pH of the solution. The maximum adsorption capacities per g of fly ash were 410mg of Acid Blue 25 and 142mg of Basic Blue 9, both with an ash dosage of 2g/L at pH 11 after a contact time of 1h. However, increasing the ash dosage to 20g/L and contact time to 24h, the maximum adsorption capacity of Basic Blue 9 raised 187mg/g fly ash at pH 11, but this value was lowered to 8.4mg/g at pH 7. Afterwards, flow experiments were carried out in semi-batch mode with a fixed amount of ash and continuous flow of dye solution in continuous stirred tank reactor, to determine the exhaustion curves of fly ash. The best fit of the results was obtained by a sigmoidal function referable to the breakthrough curve model of Yoon-Nelson. Successively, to reduce the alkali leaching by solution flow, in a semi-pilot scale plant, a continuous stream of dye solution was mixed in stirred tank reactor with a continuous ash slurry supply, and the resulting slurry was decanted in a settling tank to obtain a clarified supernatant stream outlet. In this last equipment, the optimum conditions were investigated to obtain the highest yields of dye removal from solutions at low concentrations (5-20mg/L) such as those occur in rinsing waters arising from dyeing processes. Springer-Verlag Berlin Heidelberg, 2015 Coal fly ash nationallicence Dye nationallicence Adsorption nationallicence CSTR nationallicence Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/7(2015-10-01), 1907-1915 1618-954X 17:7<1907 2015 17 10098 https://doi.org/10.1007/s10098-015-0908-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10098-015-0908-y text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Ferrero Franco Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy aut NATIONALLICENCE 773 0- Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/7(2015-10-01), 1907-1915 1618-954X 17:7<1907 2015 17 10098