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NaOH Recovery from MEROX Tower Waste Stream Using the Electrodialysis Process

2010; Taylor & Francis; Volume: 46; Issue: 1 Linguagem: Inglês

10.1080/01496395.2010.487846

1520-5754

Narjes Keramati, Ahmad Moheb, Mohammad Reza Ehsani,

Advanced battery technologies research

Abstract Electrodialysis with two different configurations was used for the recovery of NaOH from the waste stream of a MEROX tower. For this purpose, the effects of cell applied voltage and initial Na+ concentration in the feed solution on NaOH recovery and current efficiency were studied. Results showed that the recovery and current efficiency were improved by increasing the initial Na+ concentration. Also, increasing applied voltage had different effects on current efficiency. A NaOH recovery of about 70% and a current efficiency of 98% for a three-compartment cell at 15 volts showed that the method can be considered as a promising one for NaOH recovery from the waste stream of a MEROX tower. Keywords: current efficiencyelectrodialysisMEROX towerNaOH recovery ACKNOWLEDGEMENTS The authors would like to thank the National Iranian Gas Company (NIGC) for their financial support.