NDLI: Dye removal from aqueous solution using coal fly ash for continuous flow adsorption

Content Provider	Springer Nature Link
Author	Ferrero, Franco
Copyright Year	2015
Abstract	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 410 mg of Acid Blue 25 and 142 mg of Basic Blue 9, both with an ash dosage of 2 g/L at pH 11 after a contact time of 1 h. However, increasing the ash dosage to 20 g/L and contact time to 24 h, the maximum adsorption capacity of Basic Blue 9 raised 187 mg/g fly ash at pH 11, but this value was lowered to 8.4 mg/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 (5–20 mg/L) such as those occur in rinsing waters arising from dyeing processes.
Starting Page	1907
Ending Page	1915
Page Count	9
File Format	PDF
ISSN	1618954X
Journal	Clean Technologies and Environmental Policy
Volume Number	17
Issue Number	7
e-ISSN	16189558
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-01-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coal fly ash Dye Adsorption CSTR Sustainable Development Industrial Chemistry/Chemical Engineering Industrial and Production Engineering Environmental Engineering/Biotechnology Environmental Economics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Environmental Engineering Economics and Econometrics Business, Management and Accounting Management, Monitoring, Policy and Law

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