Membrane crystallization with anion-exchange hollow fibres

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28676092%3A_____%2F21%3AN0000035" target="_blank" >RIV/28676092:_____/21:N0000035 - isvavai.cz</a>

Result on the web

<a href="https://euromembrane2021.eu/abstract.html" target="_blank" >https://euromembrane2021.eu/abstract.html</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Membrane crystallization with anion-exchange hollow fibres

Original language description

Due to climate change and population growth, fresh water is becoming the important commodity. Many states, especially those situated near ocean or sea, are using big RO osmosis plants to produce fresh water from seat water. However, produced RO brine is becoming environmental threat when disposed and economic burden since fees for waste disposals are increasing. On the other hand, brines can be convenient source of minerals. For example, seawater brine can contain over 30 g/L of dissolved magnesium. [1] Membrane crystallization can represent one method how to extract magnesium from RO brine. In this work, membrane crystallization with anion-exchange hollow fibres is presented. The process is based on coupling Donnan dialysis with reactive crystallization. For this, we designed module in annular shape with anion-exchange hollow fibres. This model was immersed in tank with solutions 0.5M MgCl2 or model solutions of RO brines[1, 2]. Solutions were mixed. In the lumen side of membranes NaOH solution was flowing. In the process, OHand Clanions are exchanged through the anion-exchange hollow fibres and MgOH2 precipitate. We discussed influence of NaOH concentration on mass transfer through fibres, conversion, and particle size. In experiments with model RO brines, we focused on purity of the MgOH2 since its price is proportional to its purity. Membrane crystallization can help produce product with high purity over 90% even when the RO brine is mixture of various cations and anions in different concentrations

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20402 - Chemical process engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů