title: Induced calcium carbonate precipitation using Bacillus species.
abstract: Microbially induced calcium carbonate precipitation is an emerging process for the production of self-healing concrete. This study was aimed to investigate the effects and optimum conditions on calcium carbonate biosynthesis. Bacillus licheniformis, Bacillus sphaericus, yeast extract, urea, calcium chloride and aeration were found to be the most significant factors affecting the biomineralization of calcium carbonate. It was noticed that the morphology of microbial calcium carbonate was mainly affected by the genera of bacteria (cell surface properties), the viscosity of the media and the type of electron acceptors (Ca2+). The maximum calcium carbonate concentration of 33.78 g/L was achieved at the optimum conditions This value is the highest concentration reported in the literature.
authors.affiliation: School of Engineering, Faculty of Science and Engineering, The University of Waikato, Hamilton, New Zealand.
authors.forename: Mostafa
authors.initials: M
authors.lastname: Seifan
authors.affiliation: School of Engineering, Faculty of Science and Engineering, The University of Waikato, Hamilton, New Zealand.
authors.forename: Ali Khajeh
authors.initials: AK
authors.lastname: Samani
authors.affiliation: School of Engineering, Faculty of Science and Engineering, The University of Waikato, Hamilton, New Zealand. aydin.berenjian@waikato.ac.nz.
authors.forename: Aydin
authors.initials: A
authors.lastname: Berenjian
mesh_terms: D001407:Bacillus / Q000378:metabolism*; D002119:Calcium Carbonate / Q000378:metabolism*; D011232:Chemical Precipitation; D003470:Culture Media / Q000737:chemistry
chemical_list: D003470:Culture Media; D002119:Calcium Carbonate
keywords: Bacteria; Calcium carbonate; Concrete; Morphology; Optimization; Quantification