Crystallization of calcium carbonate with the filtration of aqueous solutions through a microporous membrane
- Authors: Ananeva E.A.1, Mesyats E.A.1, Sergievskii V.V.1
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Affiliations:
- Moscow Engineering Physics Institute (MEPhI)
- Issue: Vol 91, No 11 (2017)
- Pages: 2121-2123
- Section: Physical Chemistry of Solutions
- URL: https://journals.rcsi.science/0036-0244/article/view/169760
- DOI: https://doi.org/10.1134/S0036024417100041
- ID: 169760
Cite item
Abstract
It is established that the filtration of water through a microporous membrane does not change the hardness of the water; it does, however, reduce the amount of scale deposit, due to the crystallization of salts in water in the form of aragonite. The effect is consistently observed in water with a hardness of more than 7.0 H, a content of hydrocarbonate ions of more than 500 mg/L, and a pH ≥ 7.3. It is shown that introducing the seeds of calcite crystals into a filtrate results in the precipitation of calcite rather than aragonite. It is concluded that quasi-softening in the case of hard water microfiltration is caused by the removal of calcite micronuclei, and thus by conditions being created for the crystallization of aragonite as a thermodynamically less stable form.
Keywords
About the authors
E. A. Ananeva
Moscow Engineering Physics Institute (MEPhI)
Email: vserg@mail333.com
Russian Federation, Moscow, 115409
E. A. Mesyats
Moscow Engineering Physics Institute (MEPhI)
Email: vserg@mail333.com
Russian Federation, Moscow, 115409
V. V. Sergievskii
Moscow Engineering Physics Institute (MEPhI)
Author for correspondence.
Email: vserg@mail333.com
Russian Federation, Moscow, 115409