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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"Carbonate precipitation"”.
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Calcium carbonate precipitation kinetics
… the rate of calcium removed from water in CacO3; precipitation. The mass of CaCO3; precipitated at any moment was obtained by monitoring pH and utilizing this in the equilibrium equations for the Ca - H2CO3 system including ion pairing and ionic strength effects. Both batch and back mixing steady …
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Potential of Cyanobacterial Carbonate Precipitation for Concrete Restoration
… healing cracks and recycling concrete, microbial carbonate precipitation (MCP) by nitrogen-involved heterotrophic bacteria showed great potential. In this study, an alternative technology using autophototrophic cyanobacteria is proposed to overcome the pollution generated by urea-based MCP. This …
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Nickel hydroxy-carbonate precipitation in a pellet reactor
Precipitation in pellet reactors was developed primarily for water softening purposes, and then extended in the Netherlands in a research context to heavy metal recovery from stream concentrations varying from 10 to 10 000ppm. The metals include copper, iron, lead, manganese, nickel and zinc. The …
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Microbial-Induced Calcium Carbonate Precipitation: from micro to macro scale
Microbial-Induced Calcium Carbonate (CaCO3) Precipitation (MICP) is a biological process in which microbial activities alter the surrounding aqueous environment and induce CaCO3 precipitation. Because the formed CaCO3 crystals can bond soil particles and improve the mechanical properties of soils …
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Modeling Departures From Abiotic Expectations During the Calcium Carbonate Precipitation Process
… factors responsible for the formation of calcium carbonate (CaCO3) in natural systems, quantifying the extent to which biological influences drive precipitation in carbonate depositional environments remains an unresolved problem. Thus, a quantitative understanding of biological-mineral-aqueous …
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Marine carbohydrate-active enzymes illuminate microbial ecology, evolution, and carbonate precipitation
… on microbial ecology, evolution, and mineral precipitation. Section one reviews the application of molecular biological tools to the study of carbonate mineralization in microbial mats and identifies CAZymes as a promising target for future molecular biological studies of microbemineral …
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Manufacturing bio-bricks using microbial induced calcium carbonate precipitation and human urine
… as well as urea for microbial induced calcium carbonate precipitation (MICP) applications. MICP is a natural process that has the ability to produce bio-building material. Urine accounts for a small percentage of the total volume of domestic wastewater but contains a large percentage of the …
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Silicate Mineral Dissolution and Associated Carbonate Precipitation at Conditions Relevant to Geologic Carbon Sequestration
… release of dissolved magnesium for subsequent precipitation of Mg-carbonate minerals. This study was conducted at conditions relative to GCS. Under different geological conditions, the thermodynamics and kinetics of both dissolution and precipitation reactions can vary. The overall fate of …
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Physical and chemical controls on carbonate precipitation in surficial hot springs and subterranean cold springs
… physical and chemical parameters controls on carbonate precipitation. Macroscale (> 0.5mm) morphology and depositional patterns of carbonate precipitation in these hot and cold springs are independent of water temperature and calcite saturation states. Conversely, microscale (< 0.5mm) crystal …
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Pore-scale characterization of transverse mixing-induced calcium carbonate precipitation of relevance to geological carbon sequestration
This study examines the reaction between carbonate and calcium to precipitate calcium carbonate in an experimental model. This model is a small micro-fluidic device that incorporates a flow channel with an imprinted homogeneous pore structure to replicate the porous nature of groundwater flow. …
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A technical and economic feasibility study on repurposing copper mine tailings via microbial induced calcium carbonate precipitation
… of carbon neutral, microbial induced calcium carbonate precipitation (MICP) bio-bricks as a replacement for traditional bricks. MICP produced bio-bricks are formed by exploiting the ability of the microorganism, Sporosarcina pasteurii, to produce a biocement capable of binding sand particles …
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Facies, paleogeography, and the carbonate precipitation on the archean (2520 Ma) Campbellrand-Malmani carbonate platform, Transvaal supergroup, South Africa
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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The geochemistry of fossil termite nests in Calitzdorp, Western Cape, South Africa
… movement frequently leads to post-construction carbonate precipitation within termitaria. Fossil termitaria near Calitzdorp, Western Cape, South Africa, were described nearly two decades ago, but no detailed work has been performed on them until now. Here, these calcretised Quaternary features, …
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Calcium isotope insight into the global carbon cycle
… sink for carbon. The formation of authigenic carbonate in marine sediments is caused by the microbial degradation of organic matter. I used pore fluid measurements and a numerical model to identify zones of authigenic carbonate precipitation. This knowledge was then combined with an …
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Organic influences on hydrated magnesium carbonate mineral formation
Carbonate minerals retain organic compounds and preserve textural and chemical evidence of microbial activity early in the geologic record of Earth. For this reason, magnesium carbonates thought to be associated with lacustrine deposits in Jezero Crater are an important target of the Mars Sample …
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Assessing the Role of Solution Chemistry and Organic Matter in the Genesis of the Dengying Formation Dolostones at Sichuan Basin, China
… associated with the microspheres and possible Mg-carbonate precipitation in the carboxylated surfaces. Despite trends in the literature that suggest both silica and organic carbon play crucial roles in the availability of Mg for the dolomite reaction, our results did not document dolomite …
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An Investigation of the Geochemistry and Hydrogeology of the Queen Charlotte Fault
… revealed abundant overprinting signatures of carbonate precipitation, anaerobic oxidation of methane, and particulate organic carbon sulfate reduction processes that dictate the chemistry of the observed pore waters. These chemical processes promote the formation of carbonates and iron …
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Fluid-rock interactions in a carbon storage site analogue, Green River, Utah
… and K-feldspar dissolution largely balanced by precipitation of clay minerals and carbonate. Mineral modes, in conjunction with published surface area measurements and flow rates estimated from hydraulic head measurements, are then used to quantify the kinetics of feldspar dissolution. Maximum …
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