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Open AccessArticle

Ion Exchange Dialysis for Aluminium Transport through a Face-Centred Central Composite Design Approach

1
Department of Chemical Engineering, Durban University of Technology, Durban 4000, South Africa
2
Department of Process Engineering, Stellenbosch University, Matieland 7602, South Africa
*
Author to whom correspondence should be addressed.
Processes 2020, 8(2), 160; https://doi.org/10.3390/pr8020160
Received: 28 November 2019 / Revised: 22 December 2019 / Accepted: 7 January 2020 / Published: 30 January 2020
(This article belongs to the Special Issue Nano-Hybrid Composite Membranes)
An ion exchange dialysis (IED) is used in the recovery of aluminium from residue. In this paper, the face-centred central composite design (FC-CCD) of the response surface methodology (RSM) and desirability approach is used for experimental design, modelling and process optimization of a counter flow IED system. The feed concentration, feed flowrate, sweep flowrate and sweep concentration were selected as the process variables, with the Al transport across a Nafion 117 membrane as the target response. A total of 30 experimental runs were conducted with six centre points. The response obtained was analysed by analysis of variance (ANOVA) and fitted to a second-order polynomial model using multiple regression analysis. The actual R2 and standard deviation of the model are 0.9548 and 0.2932, respectively. Depending on the time zone of reference (24 h or 32 h), the highest enrichment of >1.50 was achieved. The designed variables were numerically optimized by applying the desirability function to achieve the maximum Al transport. The optimised condition values were found to be a feed concentration of 1600 ppm, feed flowrate of 61.76%, sweep flowrate of 37.50% and sweep concentration of 0.75 N for the 80% target response at 32 h. Overall, the model can be used to effectively predict Al recovery using the designed system. View Full-Text
Keywords: aluminium; Nafion; ion exchange dialysis; response surface methodology (RSM); desirability; coagulation; enrichment aluminium; Nafion; ion exchange dialysis; response surface methodology (RSM); desirability; coagulation; enrichment
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MDPI and ACS Style

Asante-Sackey, D.; Rathilal, S.; V. Pillay, L.; Kweinor Tetteh, E. Ion Exchange Dialysis for Aluminium Transport through a Face-Centred Central Composite Design Approach. Processes 2020, 8, 160.

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