Micronized CaCO3: a feasible alternative to limestone filtration for conditioning and (re)mineralization of drinking water?

Gude, J.C.J.; Kegel, F. Schoonenberg; Ven, W.J.C. van de; Moel, P.J. de; Verberk, J.Q.J.C.; Dijk, J. C. van

doi:10.2166/aqua.2011.012

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…There are many remineralization techniques of desalinated water 12,13,18 . ONEE adopted three remineralization techniques in plants of the mentioned areas: (1) remineralization by hydrated lime in presence of CO 2 in Laâyoune desalination plant (SDL), (2) remineralization by a passage of water through limestone bed in Daoura demineralization plant (SDD) and (3) remineralization by injection of calcium chloride CaCl 2 and sodium bicarbonate NaHCO 3 in Sidi Elghazi (or Agti Elghazi) plant (SDS) ( Figure 2).…”

Section: Figure 1 Different Steps Followed For the Production Of Drimentioning

confidence: 99%

Water quality depends on remineralization’s method in the desalination plant

Biyoune¹,

Bouargane²,

Bari³

et al. 2020

Mediterr.J.Chem.,

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Desalination of seawater is an alternative solution in arid zones to provide potable water. In south Morocco, the National Office of Electricity and Water (ONEE) has built many desalination factories. However, the osmosis water (permeate) is unbalanced and has a corrosive character. Therefore, a post-treatment of remineralization is necessary to return to water its calcio-carbonic equilibrium and to protect the distribution pipelines from corrosion degradation. Following the performance on limestone bed remineralization in Daoura plant in comparison with other methods, this article evaluates this technique, by checking the effect of parameters on water quality on the laboratory scale using a calcite bed pilot. We tested E.B.C.T (Empty Bed Contact Time), the upward speed, the bed length, the effect of water debit and the residence time on the treated water quality. Monitoring these parameters on the laboratory scale is indeed essential for optimal remineralization process. With the results of this study as well as economic consideration, it is possible to optimize the choice of the conditions needed for remineralization operation through limestone bed to minimize its costs with sizing and extrapolating to the industrial scale.

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Section: Figure 1 Different Steps Followed For the Production Of Drimentioning

confidence: 99%

Water quality depends on remineralization’s method in the desalination plant

Biyoune¹,

Bouargane²,

Bari³

et al. 2020

Mediterr.J.Chem.,

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“…The dissolution kinetics of calcium carbonate are controlled by the particle's surface area (Sjöberg 1976;Gude et al 2011;Hasson et al 2017). A larger available surface area increases the rate of dissolution.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, an alternative to calcium carbonate filtration is the addition of powdered CaCO 3 material, which has a higher specific surface area, thus enhancing its dissolution and reducing the required contact times. This method entails a dosing larger than the calcite dissolution capacity of the water to significantly speed up the reaction (Gude et al 2011). A further process step, such as ultrafiltration (UF), is then required to remove the excessive CaCO 3 powder suspension.…”

Section: Introductionmentioning

confidence: 99%

Deacidification through calcium carbonate dosing in combination with ultrafiltration

Morales

Lipp

2021

Journal of Water Supply: Research and Technology-Aqua

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Soft acidic waters are often treated for drinking water purposes by using limestone filters to attain chemical equilibrium. The present study investigated the process parameters of a relatively new process combination in which powdered calcium carbonate (CaCO3) was added prior to an ultrafiltration (UF). In order to reach the targeted pH value (≥7.8), dosing concentration, type of material and retention time were evaluated in pilot-scale experiments. The deacidification followed the same kinetics as for limestone filtration and yielded similar filtrate characteristics with dosing concentrations of 20 and 40 g/L CaCO3. No significant increase in transmembrane pressure was observed during the operation of a pilot-scale UF module at low flux (34 L m−2 h−1). Critical flux was determined in a lab scale to evaluate the potential impact of CaCO3 particles on the UF operation. Stepping-flux experiments revealed the presence of fouling only at high-dosing concentrations, resulting in a critical flux of 55 L m−2 h−1. At a higher flux, a CaCO3-fouling layer was formed, which decreased the membrane's permeability by 20% over 5 h. Considering that effective air-enhanced backwash and acidic chemical cleanings will be implemented in large-scale applications, the investigated process combination promises to be an appropriate treatment technology for turbid and soft acidic waters.

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“…A major parameter governing the kinetics of solid particles dissolution is the contact area exposed by the particles. Since contact area per unit volume is inversely proportional to particle size, micron-size particles expose a contact area 3 orders of magnitude larger than that of millimeter size particles . Dissolution of micron-size particles is therefore expected to have the adavantage of reacting at very high rates.…”

Section: Introductionmentioning

confidence: 99%

Modeling Remineralization of Desalinated Water by Micronized Calcite Dissolution

Hasson

Fine

Sagiv

et al. 2017

Environ. Sci. Technol.

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A widely used process for remineralization of desalinated water consists of dissolution of calcite particles by flow of acidified desalinated water through a bed packed with millimeter-size calcite particles. An alternative process consists of calcite dissolution by slurry flow of micron-size calcite particles with acidified desalinated water. The objective of this investigation is to provide theoretical models enabling design of remineralization by calcite slurry dissolution with carbonic and sulfuric acids. Extensive experimental results are presented displaying the effects of acid concentration, slurry feed concentration, and dissolution contact time. The experimental data are shown to be in agreement within less than 10% with theoretical predictions based on the simplifying assumption that the slurry consists of uniform particles represented by the surface mean diameter of the powder. Agreement between theory and experiment is improved by 1-8% by taking into account the powder size distribution. Apart from the practical value of this work in providing a hitherto lacking design tool for a novel technology. The paper has the merit of being among the very few publications providing experimental confirmation to the theory describing reaction kinetics in a segregated flow system.

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Micronized CaCO3: a feasible alternative to limestone filtration for conditioning and (re)mineralization of drinking water?

Cited by 10 publications

References 7 publications

Water quality depends on remineralization’s method in the desalination plant

Water quality depends on remineralization’s method in the desalination plant

Deacidification through calcium carbonate dosing in combination with ultrafiltration

Modeling Remineralization of Desalinated Water by Micronized Calcite Dissolution

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