Effects of environmental factors on microbial induced calcium carbonate precipitation

被引:476
作者
Mortensen, B. M. [1 ]
Haber, M. J. [2 ]
DeJong, J. T. [1 ]
Caslake, L. F. [2 ]
Nelson, D. C. [3 ]
机构
[1] Univ Calif Davis, Dept Civil & Environm Engn, Davis, CA 95616 USA
[2] Lafayette Coll, Dept Biol, Easton, PA 18042 USA
[3] Univ Calif Davis, Dept Microbiol, Davis, CA 95616 USA
基金
美国国家科学基金会;
关键词
bio-mediated soil improvement; calcium carbonate precipitation; soil; Sporosarcina pasteurii; subsurface; urease; SHEAR; UREA;
D O I
10.1111/j.1365-2672.2011.05065.x
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Aims: To gain an understanding of the environmental factors that affect the growth of the bacterium Sporosarcina pasteurii, the metabolism of the bacterium and the calcium carbonate precipitation induced by this bacterium to optimally implement the biological treatment process, microbial induced calcium carbonate precipitation (MICP), in situ. Methods and Results: Soil column and batch tests were used to assess the effect of likely subsurface environmental factors on the MICP treatment process. Microbial growth and mineral precipitation were evaluated in freshwater and seawater. Environmental conditions that may influence the ureolytic activity of the bacteria, such as ammonium concentration and oxygen availability, as well as the ureolytic activities of viable and lysed cells were assessed. Treatment formulation and injection rate, as well as soil particle characteristics are other factors that were evaluated for impact on uniform induction of cementation within the soils. Conclusions: The results of the study presented herein indicate that the biological treatment process is equally robust over a wide range of soil types, concentrations of ammonium chloride and salinities ranging from distilled water to full seawater; on the time scale of an hour, it is not diminished by the absence of oxygen or lysis of cells containing the urease enzyme. Significance and Impact of Study: This study advances the biological treatment process MICP towards field implementation by addressing key environmental hurdles faced with during the upscaling process.
引用
收藏
页码:338 / 349
页数:12
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