Removal of mineral scaling precursors from electrodialysis concentrate by alkaline precipitation
by Emily Mayer Andrade Becheleni; Edward Michael Peters; Ricardo Perobelli Borba; Sônia Denise Ferreira Rocha
International Journal of Environment and Waste Management (IJEWM), Vol. 31, No. 1, 2023

Abstract: Evaporative crystallisation has been used to recover water for industrial reuse but it presents serious problems related to incrustation. In this perspective, alkaline precipitation is studied in the present work, aiming to remove scale-forming salts prior to evaporative crystallisation of a reverse electrodialysis concentrate (EDC). The concentration of inorganic species in the feed and filtrate streams were determined by ICP-OES. The total organic carbon and inorganic carbon were analysed by thermo-catalytic oxidation with high temperature to assess the removal of organic compounds from EDC. The software PHREEQC was used to model the systems and a comparison with experimental results confirmed the credibility of the experiments. The technique proved to be a favourable method for removal of almost 100% of Ca and Mg by adding 0.04 wt. % of caustic soda. Furthermore, this would improve the downstream evaporative crystallisation efficiency due to reduced incrustation potential.

Online publication date: Wed, 22-Mar-2023

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