Highlights
- •Two cation resins have been tested successfully recovery of TMAH from wastewater.
- •The breakthrough parameters were obtained successfully for column tests.
- •Recovery efficiencies of TMA ions from spent resin columns were higher than 94%.
- •The comparison of adsorption capacity with various adsorbents was made.
Abstract
Two
commercial available cation resins, i.e. Amberlite IR-120 and Dowex
HCR-W2, were tested as ion exchange adsorbents to investigate their
isotherms, kinetics, breakthrough characteristics and regeneration on
removal and recovery of tetra-methyl ammonium hydroxide (TMAH) from
wastewater. Batch and column experiments were investigated to obtain
experimental data for theoretical modelling and verify the column
performance of the ion exchange process. The Langmuir isotherm
represents better equilibrium behavior of both resins on TMAH uptake.
The ion exchange kinetics follows the pseudo second order rate law also
for both resins. Furthermore, breakthrough characteristics study shows
the breakthrough curves follow the Thomas model and Yoon–Nelson model
very well. The recovery efficiencies of TMAH were obtained as 99.6 and
98.0% from wastewater by ion exchange resin column by using 9 N HCl
regeneration for Amberlite IR-120 and Dowex HCR-W2 resins, respectively.
The comparative study on TMAH ion exchange removal by Amberlite IR-120
and Dowex HCR-W2 resins in fixed bed column suggested that Dowex HCR-W2
demonstrates higher ion exchange capacity than that of Amberlite IR-120
resin.
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