Document Type : Regular Article
Department of Chemical Engineering Indian Institute of Technology Guwahati Assam 781039, INDIA
This work focuses on the liquid membrane based extractive removal of arsenic from water. The entire work has been divided into two parts. The Part 1 presents the experimental studies and mathematical modelling. The reaction mechanism of the transport of arsenic from one aqueous phase to the other via thin liquid membrane have been explored. The experimental studies have been conducted in both two phase (only extraction) and three phase (extraction and recovery) mode. Various process parameters were varied and their corresponding extraction and recovery results have been recorded for further analysis. The crucial process parameters were identified. Mass transfer coefficients, flux, phase resistances and permeability are computed via mathematical model. The extraction equilibrium constant determined from the distribution coefficient through mathematical modelling elucidates As(V) species to be favourable for extraction into organic phase, having a value of 8.2 mol/L. Further, it is found that all the species of arsenic form complex in the organic phase with aliquat 336 in the stoichiometric ratio of 1:1.