Separation of natural organic matter and sodium chloride for salt recovery purposes in zero liquid discharge

Water Resources and Industry

Ran Shang¹  Niels van Linden²  Henri Spanjers²  Georg Stockinger²  Bas Heijman³ 

[1] Corresponding author.;Delft University of Technology, Faculty of Civil Engineering and Geosciences, Stevinweg 1, 2628, CN Delft, the Netherlands;Shell Global Solutions International B.V., Grasweg 31, 1031, HW Amsterdam, the Netherlands;

关键词: Brine;    Separation;    Nanofiltration;    Electrodialysis;    Ion exchange;    SALEX;   

DOI  :  

来源: DOAJ

【 摘 要 】

The application of zero liquid discharge (ZLD) results in the generation of solid residual streams, which are often not fit for reuse. In this study, we assessed the separation of natural organic matter (NOM) and sodium chloride (NaCl) by nanofiltration (NF), electrodialysis (ED) and ion exchange (IEX) in reverse osmosis brine (RO-brine) and by the extraction of impurities from salt (SALEX) in the generated mixed solids of a full-scale ZLD water treatment plant.The NaCl recovery by NF, ED and IEX ranged 69-99% and the rejection of NOM ranged 18–19%, 43–65% and 53–76%, respectively. The recovery of NaCl by SALEX ranged 52–99%, while the rejection of NOM ranged 59–92%. The results show that NOM and NaCl can be separated both in RO-brine and mixed solids, opening opportunities for recovery of reusable salt from brines in ZLD.

【 授权许可】

Unknown