LAPSE:2020.0310
Published Article
LAPSE:2020.0310
Ion Exchange Dialysis for Aluminium Transport through a Face-Centred Central Composite Design Approach
Dennis Asante-Sackey, Sudesh Rathilal, Lingham V. Pillay, Emmanuel Kweinor Tetteh
March 25, 2020
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.
Keywords
aluminium, coagulation, desirability, enrichment, ion exchange dialysis, Nafion, response surface methodology (RSM)
Suggested Citation
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. (2020). LAPSE:2020.0310
Author Affiliations
Asante-Sackey D: Department of Chemical Engineering, Durban University of Technology, Durban 4000, South Africa
Rathilal S: Department of Chemical Engineering, Durban University of Technology, Durban 4000, South Africa [ORCID]
V. Pillay L: Department of Process Engineering, Stellenbosch University, Matieland 7602, South Africa
Kweinor Tetteh E: Department of Chemical Engineering, Durban University of Technology, Durban 4000, South Africa [ORCID]
Journal Name
Processes
Volume
8
Issue
2
Article Number
E160
Year
2020
Publication Date
2020-01-30
Published Version
ISSN
2227-9717
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PII: pr8020160, Publication Type: Journal Article
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LAPSE:2020.0310
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doi:10.3390/pr8020160
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Mar 25, 2020
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Mar 25, 2020
 
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Calvin Tsay
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