微生物诱导碳酸镁沉淀试验研究

Translated title of the contribution: Comparison between microbiologically-induced calcium carbonate precipitation and magnesium carbonate precipitation

Xiao Hao Sun, Lin Chang Miao, Tian Zhi Tong, Cheng Cheng Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

The magnesium carbonate has a cementing feature like calcium carbonate, and the strength of magnetite ore is much higher than that of calcium ore, so it is important to study the solidification technology of magnesium carbonate. The absorbance and urease activity of Sporosarcina pasteurii are measured in the cultural process, and the unit urease activity is calculated. The influences of various factors on the urease activity are studied. Some comparison tests on the precipitation efficiency between calcium carbonate and magnesium carbonate are conducted as well as the magnesium precipitation efficiency with various urea additions. The solidification tests on the calcium carbonate and magnesium carbonate are comparatively studied. The results show that during 48 h-culture period, the absorbance and urease activity curve both increase gradually and boom, then slow down and tend to be stable. The unit urease activity increases to the peak and then decreases. The increase of the urea concentration and magnesium ion can enhance the urease activity. The concentration of sodium chloride and acetate has little effect on it, and that of calcium ion has a significant inhibitory effect. Under the same condition, the yield of magnesium carbonate is significantly smaller than that of calcium carbonate. By adding urea to medium, the precipitation significantly increases. The higher the urea concentration, the more the magnesium carbonate gets. The sample with adding urea is solidified to own certain strength in the case of magnesium carbonate precipitation. Therefore, this method can solve the problem of insufficient magnesium precipitation and establish the foundation for the curing tests on magnesium carbonate in future.

Translated title of the contributionComparison between microbiologically-induced calcium carbonate precipitation and magnesium carbonate precipitation
Original languageChinese (Simplified)
Pages (from-to)1309-1315
Number of pages7
JournalYantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering
Volume40
Issue number7
DOIs
Publication statusPublished - 1 Jul 2018
Externally publishedYes

Keywords

  • Calcium carbonate
  • Influence factor
  • Magnesium carbonate
  • Sand solidification
  • Sporosarcina pasteurii

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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