Microbiologically induced calcite precipitation | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Microbiologically_induced_calcite_precipitation


00:01:37 1 Metabolic pathways
00:01:47 1.1 Autotrophic pathway
00:02:27 1.2 Heterotrophic pathway
00:03:27 1.2.1 Ureolysis or Degradation of Urea
00:05:04 2 Possible applications
00:05:15 2.1 Material science
00:05:37 2.1.1 Treatment of concrete
00:06:24 2.1.2 Bricks
00:06:56 2.1.3 Fillers for rubber, plastics and ink
00:07:22 2.2 Liquefaction prevention
00:10:46 2.2.1 Possible limitations of MICP as a cementation technique
00:13:11 2.3 Remediation for heavy metal and radionuclide contamination
00:14:21 3 Prevention



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SUMMARY
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Microbiologically induced calcium carbonate precipitation (MICP) is a bio-geochemical process that induces calcium carbonate precipitation within the soil matrix. Biomineralization in the form of calcium carbonate precipitation can be traced back to the Precambrian period. Calcium carbonate can be precipitated in three polymorphic forms, which in the order of their usual stabilities are calcite, aragonite and vaterite. The main groups of microorganisms that can induce the carbonate precipitation are photosynthetic microorganisms such as cyanobacteria and microalgae; sulfate-reducing bacteria; and some species of microorganisms involved in nitrogen cycle. Several mechanisms have been identified by which bacteria can induce the calcium carbonate precipitation, including urea hydrolysis, denitrification, sulphate production, and iron reduction. Two different pathways, or autotrophic and heterotrophic pathways, through which calcium carbonate is produced have been identified. There are three autotrophic pathways, which all result in depletion of carbon dioxide and favouring calcium carbonate precipitation. In heterotrophic pathway, two metabolic cycles can be involved: the nitrogen cycle and the sulfur cycle. Several applications of this process have been proposed, such as remediation of cracks and corrosion prevention in concrete, biogrout, sequestration of radionuclides and heavy metals.