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Removal and recovery of uranium(VI) by waste digested activated sludge in fed-batch stirred tank reactor

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Date
2018
Author(s)
Jain, Rohan
Peräniemi, Sirpa
Jordan, Norbert
Vogel, Manja
Weiss, Stephan
Foerstendorf, Harald
Lakaniemi, Aino-Maija
Unique identifier
10.1016/j.watres.2018.05.042
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Citation
Jain, Rohan. Peräniemi, Sirpa. Jordan, Norbert. Vogel, Manja. Weiss, Stephan. Foerstendorf, Harald. Lakaniemi, Aino-Maija. (2018). Removal and recovery of uranium(VI) by waste digested activated sludge in fed-batch stirred tank reactor.  WATER RESEARCH, 142, 167-175. 10.1016/j.watres.2018.05.042.
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© Elsevier Ltd
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CC BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract

This study demonstrated the removal and recovery of uranium(VI) in a fed-batch stirred tank reactor (STR) using waste digested activated sludge (WDAS). The batch adsorption experiments showed that WDAS can adsorb 200 (±9.0) mg of uranium(VI) per g of WDAS. The maximum adsorption of uranium(VI) was achieved even at an acidic initial pH of 2.7 which increased to a pH of 4.0 in the equilibrium state. Desorption of uranium(VI) from WDAS was successfully demonstrated from the release of more than 95% of uranium(VI) using both acidic (0.5 M HCl) and alkaline (1.0 M Na2CO3) eluents. Due to the fast kinetics of uranium(VI) adsorption onto WDAS, the fed-batch STR was successfully operated at a mixing time of 15 min. Twelve consecutive uranium(VI) adsorption steps with an average adsorption efficiency of 91.5% required only two desorption steps to elute more than 95% of uranium(VI) from WDAS. Uranium(VI) was shown to interact predominantly with the phosphoryl and carboxyl groups of the WDAS, as revealed by in situ infrared spectroscopy and time-resolved laser-induced fluorescence spectroscopy studies. This study provides a proof-of-concept of the use of fed-batch STR process based on WDAS for the removal and recovery of uranium(VI).

Subjects
adsorption   desorption   STR   infrared spectroscopy   uranium   sludge   
URI
https://erepo.uef.fi/handle/123456789/6707
Link to the original item
http://dx.doi.org/10.1016/j.watres.2018.05.042
Publisher
Elsevier BV
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  • Terveystieteiden tiedekunta [1324]
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