2489 Carbonate Cementation via Plant Derived Urease Cimentation carbonatée par l’utilisation d’uréase issue de plantes Hamdan N., Kavazanjian Jr. E., O’Donnell S. Research and Application Development of Microbe …

Read "Effective microbial calcite precipitation by a new mutant and precipitating regulation of extracellular urease, Bioresource Technology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Environmental factors (end product ammonium ions, free oxygen) may also affect the urease activity and there may be differences between the activity of urease within a viable cell or as a free enzyme.

Abstract. Microbe-based cement has been widely reported in recent literatures. It is a new method of consolidating loose fine particles, which relies on the bacterially induced formation of a compatible carbonate precipitation around individual particles and at particle-particle contacts.

MCP can occur via a variety of processes whereby microbial activities results in the generation of carbonate in a calcium rich environment. The urea hydrolysis by the enzyme urease of microorganisms in a calcium-rich environment is the most commonly MCP studied.

The use of Sporosarcina pasteurii to precipitate calcium carbonate in the anoxic subsurface via ureolysis has been proposed for reducing porosity and sealing fractures in rocks. Here we show that S. pasteurii is unable to grow anaerobically and that the ureolytic activity previously shown under anoxic conditions is a consequence of the urease enzyme already present in the cells of the ...

Microbial-induced carbonate precipitation using urea hydrolysis is a relatively new improvement technique for granular soils. An important factor in achieving uniform calcite deposition (and hence consistent improvements in geomechanical properties)

Applicability of Enzymatic Calcium Carbonate Precipitation as a Soil-Strengthening Technique. Full Text HTML; Details; Figures; ... Related; Downloaded 659 times. Technical Papers. Applicability of Enzymatic Calcium Carbonate Precipitation as a Soil-Strengthening Technique ... producing the urease enzyme in high proportion, or ...

ABSTRACTThe use of biocementation via microbially induced carbonate precipitation (MICP) for improving the mechanical properties of weak soils in the laboratory has gained increased attention in recent years. This study proposes an approach for applying biocementation in situ, by combining the surface percolation of nutrients and cementation solution (urea/CaCl2) with in situ cultivation of ...

This method was not suitable for determining urease activity in the presence of calcium ions (due to precipitation of calcium carbonate particles and the dampening effect of the counter ion on the solution conductivity), thus in these cases urease activity was determined …

Full-Text Paper (PDF): Enzyme Induced Carbonate Precipitation (EICP) Columns for Ground Improvement

“Carbonate cementation via plant derived urease.” Proceedings of 18th International Conference on Soil Mechanics and Geotechnical Engineering , Paris, pp. 2489–2492. Google Scholar

Ureolysis is catalyzed by the urease enzyme (urea amidohydrolase), which hydrolyzes urea [CO (NH 2) 2] into carbon dioxide (CO 2) and ammonia (NH 3), leading to increased pH and alkalinity and precipitation of calcium carbonate in the presence of calcium ions.

Cementation reagents concentrations of 0.25, 0.5, 0.75, 1.0 and 1.5M were used to evaluate the strength and hydraulic conductivity of the soil using treatment durations of 24, 48 and 60 hours.

The plant-derived urease may offer many benefits over microbial urease to induce carbonate cementation. Therefore, it is advantageous to explore the knowledge regarding such a technique as an eco-friendly method for

Microbially induced calcium carbonate ... which the urease secreted by microbes hydrolyzes urea to ammoniumandcarbondioxide,thuscausinganincreaseinthe surrounding pH which promotes CaCO 3 precipitation in ... cementation uid was introduced, thereby enhancing xation

The following are some of the publications authored and co-authored by members of the CBBG team: Al-Aqtash, U. and Bandini, P. (2014). ... Special Issue, Taylor & Francis. ... Hamdan, N., Kavazanjian, E., Jr., and Rittmann, B.E. (2013). “Carbonate Cementation via Plant Derived Urease,” Proceeding of the 18th International Conference on Soil ...

2489 Carbonate Cementation via Plant Derived Urease Cimentation carbonatée par l’utilisation d’uréase issue de plantes Hamdan N., Kavazanjian Jr. E., O’Donnell S.

In this review, we discuss microbially induced calcium carbonate precipitation (MICP) in detail. ... via increases in the urease concentration for urea hydrolysis (Okwadha and Li 2010). Therefore, urea hydrolysis has a direct relationship ... Global warming is a major environmental issue occurring primarily in response to increasing ...

Cementation of sand soil by microbially induced calcite ... 40 introducing aerobically cultivated bacteria with highly active urease enzyme into soil, ... 117 The key issue of the above process is to keep a constant degree of saturation throughout

Urease-aided calcium carbonate mineralization for engineering applications: A review. Author links open overlay panel Barbara ... Urease-aided calcium carbonate mineralization has proved to be a rapid process capable of producing large quantities of CaCO 3 in ... S. O’DonnellCarbonate cementation via plant derived urease. P. …

Nasser Hamdan. [email protected] ... Soil erosion due to wind and surface water runoff is a major sustainability issue as it can pollute streams and groundwater and cause air quality problems. Recent tests at ASU confirm the feasibility of using a topical application of plant-derived urease to induce carbonate cementation for the ...

specific organisms produce extracellular calcium carbonate which is capable of crack healing. In the present ... MICP occurs via far more complicated processes than chemically induced precipitation. The bacterial ... high potential for crack cementation of various structural formations such as granite and concrete [3, 1, 4].

The technique involves introducing aerobically cultivated bacteria with highly active urease enzyme into soil, harnessing the urease enzyme to catalyze the hydrolysis of urea to produce ammonium and carbonate ions. ... the relation between strength and amount of calcium carbonate content) is quantified via a series of laboratory tests using ...

Carbonate Cementation via Plant Derived Urease. 2489 Carbonate Cementation via Plant Derived Urease Cimentation carbonatée par l'utilisation d'uréase issue de plantes Hamdan N., Kavazanjian Jr. E., O'Donnell S. Get Price And Support Online » ...

STRENGTHENING OF SAND CEMENTED WITH CALCIUM PHOSPHATE COMPOUNDS USING PLANT-DERIVED UREASE R.A.N. Dilrukshi1, ... concentration fixed plant seeds extract (Watermelon) to obtain optimal cementation, and different ... such as grouting via cement, chemical, compaction, fracture and jet, micro piles, jacked piers, driven ...

Request PDF on ResearchGate | Effects of environmental factors on microbial induced calcium carbonate precipitation | To gain an understanding of the environmental factors that affect the growth ...

Microbial-induced carbonate precipitation using urea hydrolysis is a relatively new improvement technique for granular soils. An important factor in achieving uniform calcite deposition (and hence consistent improvements in geomechanical properties) throughout the treated soil mass is the protocol adopted for injecting the reagents of ureolytic bacteria, urea and calcium.

Mar 01, 2016· Biomineralization is a naturally occurring process in living organisms. In this review, we discuss microbially induced calcium carbonate precipitation (MICP) in detail. In the MICP process, urease plays a major role in urea hydrolysis by a wide variety of microorganisms capable of producing high ...

Carbonate Cementation via Plant Derived Urease 2489 Carbonate Cementation via Plant Derived Urease Cimentation carbonatée par l’utilisation d’uréase issue …

Home > Journals > Can. Geotech. J. Editors' Choice > List of Issues ... Ureolytic bacteria and cementation solution. The urease active ... This paper presents a novel approach for soil stabilization based on microbially induced carbonate precipitation (MICP) using urease active bioslurry as catalyzer. ...

After the introduction of bacteria, the cementation process was conducted by repeated flushes (up flushing) of the cementation solution (1·1 void volume) at a constant flow speed of 30 ml/min. After each flushing cycle, the sand column was kept at room temperature (25 ± 1°C) for 48 h.

Carbonate Cementation via Plant Derived Urease - 2489 Carbonate Cementation via Plant Derived Urease Cimentation carbonatée par lutilisation duréase issue de plantes Hamdan N., Kavazanjian Jr. E., ODonnell S.