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Environmental parameters conditioning microbially induced mineralization under the experimental model conditions.
Anna Otlewska1, Beata Gutarowska1
1Institute of Fermentation Technology and Microbiology, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Łódź, Poland.
Acta Biochimica Polonica
|February 20, 2016
Summary
Microbial calcium carbonate precipitation is influenced by environmental factors. Alkaline pH (8-9) and high agitation (180 rpm) maximize mineral formation, with calcium acetate being the most effective calcium source.
Area of Science:
- Biomineralization
- Microbial ecology
- Environmental science
Background:
- Microbially induced calcium carbonate precipitation (MICP) is a biomineralization process influenced by microenvironmental parameters.
- Microorganisms have limited control over mineral precipitation, which results from environmental and bacterial cell interactions.
Purpose of the Study:
- To investigate the impact of abiotic factors on MICP induced by Arthrobacter sulfureus, Bacillus muralis, and B. atrophaeus.
- To compare MICP with and without urea, highlighting the role of urease.
Main Methods:
- Cultivation of A. sulfureus, B. muralis, and B. atrophaeus in B4 liquid medium for 5 days.
- Varied environmental parameters: pH (6-9), temperature (25-44°C), agitation speed (0-180 rpm), and calcium sources (calcium acetate, calcium chloride, calcium nitrate).
- Comparison of MICP in the presence and absence of urea.
Main Results:
- Alkaline pH (8-9) and high agitation speed (180 rpm) significantly enhance calcium carbonate precipitation.
- Calcium acetate proved to be the most effective calcium source for biomineralization.
- The correlation between cultivation temperature and MICP was not clearly established.
- Mineral morphology and size were strain-specific and influenced by urea presence.
Conclusions:
- Abiotic factors, particularly pH and agitation, play a crucial role in controlling MICP.
- Optimized conditions (alkaline pH, high agitation, calcium acetate) can maximize mineral precipitation.
- Urea influences the morphology and size of precipitated calcium carbonate minerals.
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