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Showing 1 to 16 of 16 for “"Calcium Carbonate Precipitation"”.
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Calcium carbonate precipitation kinetics
… and Reddy is presented to describe 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 …
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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 …
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Manufacturing bio-bricks using microbial induced calcium carbonate precipitation and human urine
… production 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 …
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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
… adoption 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 …
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Biomineralization in cement based materials : inoculation of vegetative cells
… It was also observed that an increase in calcium carbonate precipitation, particularly calcite, occurred within cement paste when the bacterial medium was used. Furthermore, use of the bacterial medium resulted in reducing the porosity and increasing the compressive strength of the …
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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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Effects of Scale Reduction Technologies and Chemical Inhibitors on Calcium Precipitation in Premise Plumbing Systems
Precipitation of solids in plumbing systems (i.e., scaling) is a major problem in both traditional tank (electric and gas) and tank-less building hot water systems. Scaling can cause energy inefficiencies, flow reduction, pressure loss, and erosion corrosion damage. Consumers are also concerned …
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Quantification of bond strength between cementitious materials and microbially-induced calcium carbonate precipitates
… the capabilities of microbially-induced calcium carbonate precipitation to fill and seal cracks in cementitious materials. However, the mechanical strength of microbially-induced crack healing is seldom investigated, especially at the fundamental level. In an effort to aid future …
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Bacterial adhesion and detachment from model mineralized biofilms
… including the pipe networks of DWDSs. Calcium carbonate is also often found precipitated on pipe walls and biofilms, but the influence of its presence on the interaction between biofilms and pathogens is still unknown. The objective of this study is to determine the influence of calcium …
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High-performance carbonatable cementitious systems: novel materials and processing methods
… stable, durable, and environmentally friendly carbonate materials. Despite a wealth of literacy and the major technological developments related to CCMs in recent decades, the expanded use of these eco-friendly materials depends on addressing their fundamental limitations (i.e., chemical, …
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Linking the kinetics of formation and growth to the mechanical properties of calcium carbonate composites
Calcium carbonate, the most common among other biogenic minerals, is widely used in skeletal components in marine organisms. These organisms exploit varied physical and chemical interactions between calcium carbonate and organic additives to direct the precipitation process through thermodynamic …
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Effect of Bacterial Strain on MICP and its Application for the Erosion Control of Fine Sands
… In this context, microbial induced calcium carbonate (CaCO3) precipitation (MICP) could be used to enhance the erosion performance of soils. This research investigates the influence of the CaCO3 microstructure on the macromechanical erosion response of fine sands by combining …