Article: Characterization of bio-adsorptive removal performance of strontium through ureolysis-mediated bio-mineralization
Chemosphere. 2022 Feb., v. 288
2022
Abstract: The adsorptive removal performance of strontium (Sr) through bio-mineralization metabolism under various parameters was evaluated in this study. The primary mechanism of bio-mineralization used in this study was the urea hydrolysis process through ... ...
Abstract | The adsorptive removal performance of strontium (Sr) through bio-mineralization metabolism under various parameters was evaluated in this study. The primary mechanism of bio-mineralization used in this study was the urea hydrolysis process through bacterial enzymatic catalysis. Bacillus sp, which was isolated from river sediment, was used as a ureolytic bacteria. Various environmental conditions were set as different initial concentrations of Sr (10, 50, 100, 200, and 500 mg/L), and various ratios of Mg/Ca (4, 2, 1, 0.5, and 0.25). The concentrations of Sr²⁺, Ca²⁺, and Mg²⁺ in the solution of the batch experiment were measured to identify the bio-mineralization performance and the removal rate of Sr. In addition, the main Sr removal mechanism of ureolytic bacteria was identified. As a result, for Sr removal of bacteria, the bio-mineralization mechanism was more predominant than the adsorption of Sr. The rapid growth and high nucleation site production were observed when the initial concentration of Sr²⁺ increased and the Mg/Ca ratio was lowered, resulting in high biomineralization performance and Sr removal rate. The main phases of carbonate minerals formed in the presence of Sr, Ca, and Mg were SrCO₃ and SrCa(CO₃)₂. Mg²⁺ could retard the bacterial growth and participate in the formation of carbonate minerals, when a large amount of Mg²⁺ was present. Furthermore, the desorption rate of Sr²⁺ from bacterial pastes containing the carbonate minerals increased as the concentration of HCl increased, although the carbonate minerals were in a stable state. |
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Keywords | Bacillus (bacteria) ; adsorption ; bacterial growth ; biomineralization ; calcium ; catalytic activity ; desorption ; hydrolysis ; metabolism ; rivers ; sediments ; strontium ; urea |
Language | English |
Dates of publication | 2022-02 |
Publishing place | Elsevier Ltd |
Document type | Article |
ZDB-ID | 120089-6 |
ISSN | 1879-1298 ; 0045-6535 ; 0366-7111 |
ISSN (online) | 1879-1298 |
ISSN | 0045-6535 ; 0366-7111 |
DOI | 10.1016/j.chemosphere.2021.132586 |
Database | NAL-Catalogue (AGRICOLA) |
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