Feasibility and optimisation of a batch mode capacitive deionization (BM CDI) process for textile cationic dyes (TCD) removal and recovery from industrial wastewaters

Feasibility, optimisation and modelization of textile cationic dyes (TCD) removal and recovery from industrial wastewaters by batch mode capacitive deionization (BMCDI), with activated carbon (AC) electrodes, were investigated. The synergy hypothesis, AC adsorption-electrochemical double layer effects, was verified and measured by the high CDI efficiency (approximate to 99%) which was three times higher than conventional AC adsorption, demonstrating the intensification of the TCD removal by CDI. Unlike the adsorption and biological established treatments, the BMCDI presents real environmental performance and sustain ability (recycling of pristine treated water, recovery of TCD and clean regeneration of AC electrodes). This research study was mainly focused on the concentration time (C-t) and q(X/M)-t curves of batch runs, at different pHs, applied voltages (V) or flow rates (Q). The BMCDI efficiency was measured by the final equilibrium concentration C-fineq and electrode specific adsorption, q(X/M). CDI has rarely been studied as removal and recovery method of TCD. This BMCDI approach is thus quite novel and potentially applicable. (C) 2018 Elsevier Ltd. All rights reserved.