Calcium oxalate crystallization on concrete heterogeneities

Arvaniti, Eleni; Lioliou, Maria G.; Paraskeva, Christakis Α.; Payatakes, A. C.; Østvold, Terje; Koutsoukos, P. G.

doi:10.1016/j.cherd.2009.09.013

Cited by 17 publications

(10 citation statements)

References 17 publications

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“…When membranes are used for water and wastewater treatment, crystallization of CaCO 3 , phosphate, or other salts reduces their lifetime. On the other hand, the controlled precipitation of sparingly soluble salts is applied for waterproofing of underground structures (e.g., tunnels), prevention of soil erosion, and for the stabilization of unconsolidated rocks to avoid or to minimize sand transportation during oil extraction. , …”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the controlled precipitation of sparingly soluble salts is applied for waterproofing of underground structures (e.g., tunnels), prevention of soil erosion, and for the stabilization of unconsolidated rocks to avoid or to minimize sand transportation during oil extraction. 8,9 During the past few decades, the issue of mechanisms underlying salt precipitation on surfaces or in porous media has been investigated by several research groups. The parameters studied included pH, temperature, the presence of various substances, the presence of seed crystals, and their effect on salt precipitation.…”

Section: ■ Introductionmentioning

confidence: 99%

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Mineral Scaling in Microchips: Effect of Substrate Wettability on CaCO₃ Precipitation

Tzachristas

Malamoudis

Kanellopoulou

et al. 2020

Ind. Eng. Chem. Res.

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In the present work, the effect of wettability on CaCO 3 precipitation was approached by monitoring crystal formation in microchips of different wettability degree. Solutions of calcium chloride and sodium bicarbonate were mixed in hydrophilic and neutral-wet Y-junction microchips, and the precipitation of CaCO 3 crystallites was monitored. Sequential pictures showed the formation and growth of CaCO 3 crystals as a function of time, and the precipitates were identified by Raman spectroscopy. The obtained results indicated that in hydrophilic microchips, the increase of supersaturation ratio value resulted in higher growth rates and aggregate formation. The neutral-wet microchip surfaces were found to accelerate the precipitation of CaCO 3 compared to hydrophilic surfaces, and in the case of neutral-wet surfaces, crystallites were formed mainly close to the wall surfaces. In hydrophilic microchips, calcite was the main precipitate, while aragonite formation was favored in neutral-wet microchips.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Mineral Scaling in Microchips: Effect of Substrate Wettability on CaCO₃ Precipitation

Tzachristas

Malamoudis

Kanellopoulou

et al. 2020

Ind. Eng. Chem. Res.

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“…(4) [10] the reduction of the level of both the calcium ions and oxalate ions will have an effect on the precipitation of solid calcium oxalate. A possible way to reduce the level of calcium ions is their precipitation into salts which can be filtered off easier than calcium oxalates.…”

Section: Chemical Mitigationmentioning

confidence: 99%

Reduction of Turbidity of Beet Sugar Solutions by Mechanical and Chemical Treatment

Abdel-Rahman¹,

Floeter

2014

International Journal of Food Engineering

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The presence of practically non-dissolvable small particles in sugar solutions can cause haze during application and has to be minimal. Intermediate storage of thick sugar juice becomes increasingly common practice. In particular juices treated with anti-scale agents appear to be prone to turbidity development. This work on turbidity mitigation reports results on both laboratory and industrial level experiments. Different filter aids were tested and led to reduced turbidity levels. At industrial and lab scale reductions in the order of 30-54% and 50-70% were achieved respectively, which however remains insufficient to resolve the problem. The chemical mitigation by reduction of the hardness of the juice either by sodium carbonate or by ion exchanger treatment was investigated. While the reduction of the calcium concentration by dosing of sodium carbonate turned out to be basically possible, this remains less practical than the utilization of cation exchangers. Furthermore, it was found that application of anti-scale agents causes a reduction on the particle sizes that are found in thick juice samples after 2 months storage. Turbidity values of these samples were, independent of dosage and type of anti-scale agent, twice as high as in reference samples.

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“…Boosting sparingly soluble salts precipitation is of great importance for waterproofing of underground structures (e.g. tunnels), prevention of soil erosion through consolidation and in stabilization of brittle rocks to avoid or minimize sand transportation during oil extraction . In oil extraction, the produced water stream, usually seawater is used for the displacement of trapped oil ganglia towards the central oil well bores.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of sparingly soluble salts in packed sandbeds in the presence of miscible and immiscible organic substances

Pavlakou

Sygouni

Lioliou

et al. 2016

Crystal Research and Technology

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Sparingly soluble salts precipitation, e.g. calcium carbonate or calcium sulfate, results in pore clogging in rock formations and in the concomitant reduction of the local permeability of oil wells during the oil extraction processes. On the other hand, in situ controlled salt precipitation is desirable in various applications e.g. waterproofing of concrete constructions suffering from leakages, etc. In the present study, calcium carbonate (CaCO 3 ) precipitation in sandbeds was investigated, in the presence of organic solvents simulating the conditions prevalent in oil-well zones. CaCO 3 precipitation was investigated from supersaturated solutions prepared by in-situ mixing of NaHCO 3 and CaCl 2 .2H 2 O solutions before the inlet of sandbeds. The solution resulting from the mixing of the two solutions was supersaturated with respect to all calcium carbonate polymorphs. Three types of experiments were performed depending on the supersaturated solutions: a) aqueous solutions b) aqueous supersaturated solutions in contact with sandbeds presaturated with n-dodecane c) aqueous solutions containing monoethylene glycol (MEG). Results showed that oil-water interfaces enhanced the heterogeneity of the supersaturated solutions and accelerated crystal growth of calcium carbonate at the inlet of the sandbed, resulting in early pore clogging and limitation of local permeability. Maximum sandbed consolidation was obtained with the solutions containing MEG.

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Calcium oxalate crystallization on concrete heterogeneities

Cited by 17 publications

References 17 publications

Mineral Scaling in Microchips: Effect of Substrate Wettability on CaCO₃ Precipitation

Mineral Scaling in Microchips: Effect of Substrate Wettability on CaCO₃ Precipitation

Reduction of Turbidity of Beet Sugar Solutions by Mechanical and Chemical Treatment

Precipitation of sparingly soluble salts in packed sandbeds in the presence of miscible and immiscible organic substances

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Calcium oxalate crystallization on concrete heterogeneities

Cited by 17 publications

References 17 publications

Mineral Scaling in Microchips: Effect of Substrate Wettability on CaCO3 Precipitation

Mineral Scaling in Microchips: Effect of Substrate Wettability on CaCO3 Precipitation

Reduction of Turbidity of Beet Sugar Solutions by Mechanical and Chemical Treatment

Precipitation of sparingly soluble salts in packed sandbeds in the presence of miscible and immiscible organic substances

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Product

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Mineral Scaling in Microchips: Effect of Substrate Wettability on CaCO₃ Precipitation

Mineral Scaling in Microchips: Effect of Substrate Wettability on CaCO₃ Precipitation