Removal rates of electrolytes commonly found in brackish groundwater by means of electrodialysis reversal desalination

This thesis tested and analyzed the removal rates of six different electrolytes: NaCl, Na2SO4 , MgCl2 , K2SO4 , Ca(NO3 )2, and CaSO4 when using electrodialysis reversal (EDR) desalination. A bench top EDR set-up was designed and built, and this set-up was used to desalinate feed water with initial concentrations of about 1000 ppm of each of the electrolytes. The tests ran until the diluate stream reached a concentration of 415 ppm. These results were then compared to a mathematical model that predicts the electrolyte removal behavior, and the experimental results did align with the model. When the mathematical model was used to estimate the electrolytes' behaviors for beginning concentrations of exactly 900 ppm, it was shown that the ranking of electrolytes with highest to lowest removal rates is NaCl (38.8 ppm/min when the diluate concentration is 415 ppm), K2SO4 (36.0 ppm/min), CaSO4 (33.6 ppm/min), Na2SO4 (33.4 ppm/min), MgCl2 (32.7 ppm/min), and Ca(NO3)2 (31.8 ppm/min).

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2015

Author dc:creator

• Van de Zande, Georgia D

Advisor dc:contributor.advisor

• Amos Winter.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/98756

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/98756