Enhanced calcite precipitation for crack healing by bacteria isolated under low-nitrogen conditions.

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ID: 37254
2019
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Abstract
A nitrogen-starving isolation strategy was developed for the first time to screen bacteria with high calcium-precipitating activity (CPA) for bioremediation of damage in porous media. Meanwhile, a novel mini-tube method based on the detection of insoluble Ca was established to evaluate the CPA of the isolates. A low-nitrogen-demanding strain B6, identified as Bacillus sp., was screened to exhibit the highest CPA (55 mM insoluble Ca). Furthermore, the effects of environmental factors and nutrient availability on B6-induced calcium precipitation were evaluated. The results show that nitrate and starch are the best nitrogen source and carbon source with optimal concentration being 4 and 2 g L, respectively. The suitable pH range for B6 to precipitate calcium is from 8.5 to 10.5. B6 can maintain the highest CPA at an initial spore concentration of 1.0 × 10 spores·mL. The optimal CaO dosage is 10 g L. Finally, the calcite precipitation is confirmed by ESEM, EDS, and XRD analysis.
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zhang2019enhancedapplied Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhang, Jinlong;Xie, Le;Huang, Xingtao;Liang, Zhiyong;Liu, Bing;Han, Ningxu;Xing, Feng;Deng, Xu;
Journal Applied microbiology and biotechnology
Year 2019
DOI
10.1007/s00253-019-10066-z
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