Studies on Reactive Precipitation of Sodium Chloride Crystals from Evaporative Residue of Reverse Osmosis

Boopathy R.*, Rames C Panda**, Sekharan G***
* Research Scholar, Chemical Engineering Department, CLRI, (CSIR), Chennai, India.
** Senior Scientist, Chemical Engineering Department, CLRI, (CSIR), Chennai, India.
*** HOD & DD, Environmental Technology Division, CLRI, (CSIR), Chennai, India
Periodicity:February - April'2015
DOI : https://doi.org/10.26634/jfet.10.3.3345

Abstract

Though Reverse Osmosis (RO) is a viable solution for separation in the purification and treatment of water, disposal of concentrated brine poses a problem. It is possible to recover salts for use in some other applications from the brine enriched salts. Development of reactive precipitation model for the highly soluble sodium chloride salt has been presented here. Salting-out of sodium chloride was achieved by bubbling gaseous hydrogen chloride in the evaporative residue solution. The influence on sodium chloride precipitation with respect to the hydrogen chloride purging contact time and precipitation distribution inside of the reactor was studied. Mathematical models representing changes in concentration of sodium ions in residual liquor and population balance of crystallized salt are formulated separately and are validated for the semi batch reactor. The maximum growth in size of crystal was achieved as 500 μm. Results show the way to recover soluble salts in zero liquid discharge, that may have high value and importance from environmental sustainability point.

Keywords

Precipitation, Crystallization, Sodium Chloride, Population Balance Model.

How to Cite this Article?

Boopathy, R., Panda, R. C., and Sekharan, G. (2015). Studies On Reactive Precipitation Of Sodium Chloride Crystals From Evaporative Residue Of Reverse Osmosis. i-manager’s Journal on Future Engineering and Technology ,10(3), 18-28. https://doi.org/10.26634/jfet.10.3.3345

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