Dissolved and gaseous inorganic carbon sequestration using a close system cell-free ureolytic calcification process
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Abstract
Ureolysis mediated increase of culture medium pH, dissolved inorganic carbon (DIC) by Bacillus pasteurii and subsequent utilization of the cell-free broth on calcification mediated carbon (CO2) capture was investigated. In an ureolytic process with an initial biomass of 80 mg/l, about 55 % of the original urea (100 mM) in the nutrient broth-NaCl medium was hydrolyzed over 24 h; this increased DIC to 1,145 mg/l and pH to 9.1. The gas phase CO2 capture experiment, which used the culture medium supernatant in a closed system (liquid phase to headspace volume ratio of 1:3) containing 28.45 % v/v headspace CO2 (g), was triggered by injecting 50 mM CaCl2. The calcification process decreased both the headspace CO2 and the liquid phase DIC to 18.48 % v/v and 942 mg/l, respectively, through precipitation of total 27.41 mM CaCO3. Although only 21.8 % of the DIC input from ureolysis was actually captured as solid carbonate, solubility trapping (as soluble carbonate in DIC) effectively regulated CO2 release into the atmosphere.
Keywords
Bacillus pasteurii Carbon dioxide capture Dissolved inorganic carbon Solubility trapping Ureolytic calcificationNotes
Acknowledgments
This research was financially supported by NRF project of development of biomimetic technology for acid soil rehabilitation using biocalcification process and partially by INHA University Research Grant.
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