Augmenting Pozzolanic Stabilization Using Novel Microbial Carbonate Precipitation in a Soft Soil

Bio-cementation is a sand consolidation technology, in which ureolytic bacteria release carbonate from urea hydrolysis in the presence of an excess of calcium ions to form calcite (CaCO3) in-situ. Biocementation is to enhance the strength and stiffness properties of soil and rocks though microbial activity or products. This paper addressed the prospect of microbial carbonate precipitation for erosion control in Bangladesh. Bacterial CaCO3 precipitation under appropriate conditions is a general phenomenon where the ureolytic bacteria uses urea as an energy source and produces ammonia which increases the pH in the environment and generates carbonate, causing Ca2+ and CO32- to be precipitated as CaCO3. This CaCO3 join sand particles and forms rocklike materials that auto-repairs by means of sunlight, seawater, and bacteria as microbially induced carbonate precipitation method. These rock particles when produced artificially is called artificial rock and has the potentiality to protect coastlines from erosion.J. Environ. Sci. & Natural Resources, 9(1): 59-61 2016

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Improvement of Concrete Materials by Bacterial-Mediated Precipitation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.306-307.455 ◽

2011 ◽

Vol 306-307 ◽

pp. 455-458 ◽

Cited By ~ 1

Author(s):

Pei Hao Li ◽

Wen Jun Qu

Keyword(s):

Laboratory Experiments ◽

Carbonate Precipitation ◽

Accelerated Carbonation ◽

X Ray Diffraction ◽

Capillary Water ◽

X Ray ◽

Microbial Carbonate ◽

Microbial Carbonate Precipitation ◽

Concrete Materials ◽

Capillary Water Uptake

Microbial carbonate precipitation had been proposed as alternative technique for improvement in concrete materials. Laboratory experiments were conducted by bacterially mediated carbonate deposition on the surface and subsurface of concrete specimens. The crystal phase, morphology and growth of the crystal deposited on specimens as well as the efficiency of bonding and protection were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM), and ultrasonic test. Water absorption and the resistance of carbonation of concrete were analyzed by water absorptivity test and concrete accelerated carbonation test, respectively. Results show that phases of crystal are calcite and vaterite. The crystals are deposited uniformly on the surface of specimens. Biodeposotion effectively reduces capillary water uptake and carbonation rate constant.

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A critical review on microbial carbonate precipitation via denitrification process in building materials

Bioengineered ◽

10.1080/21655979.2021.1979862 ◽

2021 ◽

Vol 12 (1) ◽

pp. 7529-7551

Author(s):

Surabhi Jain ◽

Chaolin Fang ◽

Varenyam Achal

Keyword(s):

Critical Review ◽

Building Materials ◽

Carbonate Precipitation ◽

Microbial Carbonate ◽

Microbial Carbonate Precipitation ◽

Denitrification Process

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Carbonate precipitation by the thermophilic archaeon <i>Archaeoglobus fulgidus</i>: a model of carbon flow for an ancient microorganism

Biogeosciences Discussions ◽

10.5194/bgd-5-3409-2008 ◽

2008 ◽

Vol 5 (4) ◽

pp. 3409-3432

Author(s):

L. L. Robbins ◽

K. A. Van Cleave ◽

P. Ostrom

Keyword(s):

Organic Carbon ◽

Inorganic Carbon ◽

Isotopic Fractionation ◽

Archaeoglobus Fulgidus ◽

Precipitation Process ◽

Carbonate Precipitation ◽

Lactate Oxidation ◽

Thermophilic Archaeon ◽

Microbial Carbonate ◽

Microbial Carbonate Precipitation

Abstract. Microbial carbonate precipitation experiments were conducted using the archaeon bacteria Archaeoglobus fulgidus to determine chemical and isotopic fractionation of organic and inorganic carbon into mineral phases. Carbonate precipitation was induced in two different experiments using A. fulgidus to determine the relative abundance of organically derived carbon incorporated into carbonate minerals as well as to define any distinct phases or patterns that could be attributed to the precipitation process. One experiment used a medium containing 13C-depleted organic carbon and 13C-enriched inorganic carbon, and the other used a 14C-labeled organic carbon source. Results indicated that 0.9–24.8% organic carbon was incorporated into carbonates precipitated by A. fulgidus and that this process was mediated primarily by pH and CO2 emission from cells. Data showed that the carbon in the CO2 produced from this microorganism is incorporated into carbonates and that the rate at which precipitation occurs and the dynamics of the carbonate precipitation process are strongly mediated by the specific steps involved in the biochemical process for lactate oxidation by A. fulgidus.

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