The Comparison of Microbiologically-Induced Calcium Carbonate Precipitation and Magnesium Carbonate Precipitation
Similar to calcium carbonate, magnesium carbonate also has a cementing character, and the strength of magnetite ore is much higher than calcium ore. In this paper, firstly, the effects of different ions, such as the concentration of Ca2+ and Mg2+, on the urease activity of Sporosarcina pasteurii were researched. Then the productive rates for calcium carbonate and magnesium carbonate were comparatively analyzed. Finally, with adding various amounts of urea to medium, the productive rates for magnesium carbonate were compared. The results show that the increase in the magnesium ion enhances urease activity, while calcium with high concentration significantly impairs it. Under the same conditions, productive rate for magnesium carbonate is smaller than its calcium counterpart. However, the method adding urea to the medium significantly promotes to form precipitation, and with higher urea concentration, more magnesium precipitation is got. Therefore, the presented method can solve the problem that insufficient magnesium precipitation cannot solidify sands, which acts as a guide for the magnesium carbonate sand solidification technology.
KeywordsSporosarcina pasteurii Calcium carbonate Magnesium carbonate Productivity rate
This work was supported by the National Natural Science Foundation of China (No. 51578147) and Scientific Research Foundation of Graduate School of Southeast University (No. YBJJ1846).
- 8.Whiffin VS (2004) Microbial CaCO3 Precipitation for the Production of Biocement. Murdoch University, PerthGoogle Scholar