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In relation to this article, we declare that there is no conflict of interest.
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Received April 17, 2021
Accepted September 28, 2021
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Calcium precipitation to remove fluorine in groundwater:Induced by Acinetobacter sp. H12 as a template

1School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2Shaanxi Key Laboratory of Environmental Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
sjf1977518@sina.com
Korean Journal of Chemical Engineering, March 2022, 39(3), 655-663(9), 10.1007/s11814-021-0969-z
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Abstract

Calcium precipitation induced by Acinetobacter sp. H12 can simultaneously remove F- and Ca2+. Adsorption kinetics and isotherm studies showed that the defluoridation effect improved with the increase of temperature and time. The equilibrium adsorption capacity of calcium precipitation was 7.43mg g-1 at the initial F- concentration of 10mg L-1. Moreover, as the pH increased, the F- adsorption capacity decreased and the Ca2+ removal rate gradually increased. The adsorption process was highly fitted to the pseudo-second-order and the Freundlich isotherm. Adsorption_x000D_ thermodynamics analysis demonstrated that the adsorption process was a spontaneous endothermic reaction. The activation adsorption energy was 2.81 kJ mol-1 and the frequency coefficient was 10.88 h-1. EEM, SEM, XPS. XRD results indicated that the defluoridation mechanism may be due to adsorption and co-precipitation. The mechanism of Ca2+ removal may be co-precipitation with F-. It is worth-mentioning that calcium precipitation overcame the problem of adding carbon sources and avoided the microbial safety risk in the effluent. Therefore, a new insight was proposed_x000D_ for simultaneous remediation of Ca2+ and F- from groundwater combining the biological and chemical method.

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