A microbial grouting method to increase the early deposition of calcium carbonate
A sedimentation and microbial technology, applied to underwater structures, water conservancy projects, artificial islands, etc., can solve the problems of effectively sealing concrete cracks and low early sediment production, so as to increase the total production and reduce the amount and frequency of grouting , Improve the effect of early yield
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[0029] The present invention is based on the mechanism of microorganism-induced deposition of calcium carbonate, and according to the results of comparative experiments, the formulation of the grouting material with the highest amount of calcium carbonate deposition is proposed as follows:
[0030] (1) Bacteria liquid, adopt Bacillus pasteurii (Bacillus pasteurii), the enzyme activity of the bacteria liquid needs to be greater than 1 by the conductivity method.
[0031] (2) Nutrient salt solution, which provides nutrients for the growth and reproduction of microorganisms, selects urea (CO(NH 2 ) 2 ) solution.
[0032] (3) Calcium source solution, if calcium nitrate (Ca(NO 3 ) 2 ) solution, the concentration is 2mol / L; if calcium chloride solution (Cacl 2 ) solution with a concentration of 3mol / L.
[0033] (4) Add urea to the bacterial solution 1 hour in advance, and the urea concentration is 4.5mol / L. Adding urea to the bacterial solution in advance can increase the earl...
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