CaCO3–CO2–H2O system in falling film on a bank of horizontal tubes: Model verification

Al‐Rawajfeh, Aiman Eid

doi:10.1016/j.jiec.2010.04.006

Cited by 8 publications

(1 citation statement)

References 31 publications

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“…Supersaturation conditions are reached by distillation of a given amount of water which increases the ionic feed concentration and hence lowering the solubility of inversely soluble salts. This is achieved by increasing the temperature from ambient to high temperature prevailing in the thermal plants and shifting the reactions of the Ca-CO 2 -H 2 O system to releasing more CO 2 and producing CO 3 2− reaching the supersaturation of CaCO 3 scale [26]. Fig.…”

Section: Scale Inhibition Mechanismsmentioning

confidence: 99%

Inhibitory effect of Hydrex anti-scalant on calcium scale deposition from seawater under multiple-effect distillers' conditions

Al‐Rawajfeh

Alrawashdeh

Al-Shabatat

et al. 2015

Water Resources and Industry

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a b s t r a c tIn this work, the inhibitory effect of a commercial anti-scalant (Veolia Hydrex s 9209) on the calcium minerals of carbonate, sulfate and hydrocalumite (Ca/Al) clay deposition from seawater has been investigated. Different concentration factors and anti-scalant doses were studied by analyzing the water hardness and turbidity. The inhibitory effect of the investigated anti-scalant was efficient even at lower concentrations. The percentage inhibition decreases with increasing the temperature and increases with increasing the dose/amount of the anti-scalant. The carbonate scale inhibition was 499% and 98-99% at 50 and 70°C, respectively. The percentage inhibition of sulfate from hemihydrate was ranged from 80% to 87% for 2 and 8 ppm anti-scalant at 50°C. The inhibition of Ca/Al hydrocalumite deposition increases from 70% to 90% upon increasing the dose from 3 to 5 ppm, respectively. A recommended useful dose of antiscalant for seawater is 5 ppm.

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Section: Scale Inhibition Mechanismsmentioning

confidence: 99%

Inhibitory effect of Hydrex anti-scalant on calcium scale deposition from seawater under multiple-effect distillers' conditions

Al‐Rawajfeh

Alrawashdeh

Al-Shabatat

et al. 2015

Water Resources and Industry

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Influences of pH and CO2 on the formation of Metasilicate mineral water in Changbai Mountain, Northeast China

Yan

Liang

Shili³

2015

Appl Water Sci

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Mineral dissolution reactions actively participate in controlling the composition of mineral water. In this study, water soluble, acidic-alkaline and carbonated solution experiments were designed, and mineral reaction mechanisms were researched using chemical kinetics and the minimum free-energy method. The results showed that the release of metasilicate was controlled by pH, CO 2 , and rock characteristics. In the water soluble experiment, the release process of metasilicate in powdered rocks reached equilibrium after 40 days, while metasilicate in solid rocks took 170 days. The release process of metasilicate in solid rocks satisfied an asymptotic model, while in powdered rocks it accorded with the Stanford reaction kinetic model. In the acidic-alkaline experiment, metasilicate was released earlier under acidic conditions (2.46 \ pH \ 7) than under alkaline conditions (7 \ pH \ 10.61). The release process of metasilicate under acidic conditions reached equilibrium in 40 days, compared with 60 days for alkaline conditions. The addition of CO 2 to the water solution was beneficial to the formation of metasilicate. Under neutral pH conditions, the reaction barely occurred. Under alkaline conditions, metasilicate was produced by the hydrolysis of metasilicate minerals. Under acidic and additional CO 2 conditions, metasilicate formation was mainly via the reaction of H ? , CO 2 , and metasilicate minerals. From these results, we concluded that the metasilicate mineral water from the Changbai Mountains, Jingyu County, is generated by a combination of the hydrolysis of metasilicate minerals and the reaction of H ? , CO 2 , and metasilicate minerals. These results can contribute to a better development and protection of the mineral water resources in the Changbai Mountains.

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Scale formation model for high top brine temperature multi-stage flash (MSF) desalination plants

Al‐Rawajfeh

Ihm²,

Varshney³

et al. 2014

Desalination

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CaCO3–CO2–H2O system in falling film on a bank of horizontal tubes: Model verification

Cited by 8 publications

References 31 publications

Inhibitory effect of Hydrex anti-scalant on calcium scale deposition from seawater under multiple-effect distillers' conditions

Inhibitory effect of Hydrex anti-scalant on calcium scale deposition from seawater under multiple-effect distillers' conditions

Influences of pH and CO2 on the formation of Metasilicate mineral water in Changbai Mountain, Northeast China

Scale formation model for high top brine temperature multi-stage flash (MSF) desalination plants

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