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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 10, No. 1, 2013, pp. 141-150
Bioline Code: st13016
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 10, No. 1, 2013, pp. 141-150

 en Precipitation of carbonates by bacteria isolated from wastewater samples collected in a conventional wastewater treatment plant
Rivadeneyra Torres, A.; Martinez-Toledo, M. V.; Gonzalez-Martinez, A.; Gonzalez-Lopez, J.; Martín-Ramos, D. & Rivadeneyra, M.A.

Abstract

This research studied the precipitation of calcium carbonate by populations of bacteria from domestic wastewater cultivated in both natural and artificial solid culture media. The only carbonate-forming bacteria detected appeared in an artificial medium added with calcium acetate. Precipitation occurred three days after inoculation, and the percentage was slightly higher than 65 %. Our results showed that nine major carbonate-forming colony types were the dominant heterotrophic platable bacteria growing aerobically in artificial media added with calcium acetate. According to their taxonomic affiliations (based on partial sequencing of the 16S-rRNA), the nine strains belonged to the following nine genera of Gram-negative and Gram-positive bacteria: Caulobacter check for this species in other resources , Blastomonas check for this species in other resources , Roseobacter check for this species in other resources , Staphylococcus check for this species in other resources , Bacillus check for this species in other resources , Gemmatimonas check for this species in other resources , Saccharopolyspora check for this species in other resources , Microthrix check for this species in other resources , and Sphingomonas check for this species in other resources . All of these strains formed calcium carbonate, precipitated as calcite and vaterite in different proportions and shapes (spheres, hemispheres, dumbbells, and pseudopolyhedral forms). The results of this study suggest that in real domestic wastewater, the precipitation of carbonates through bacterial action could not take place in situ because the concentrations of calcium did not create the optimal circumstances for biomineralization. However, in the artificial media, it was possible to induce this process by adding calcium ions.

Keywords
Calcite; Calcium carbonate; Domestic wastewater; Vaterite

 
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