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Effect of some operating variables on citrate recovery from model solutions by electrodialysis
Author(s) -
Moresi Mauro,
Sappino Fabiana
Publication year - 1998
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/(sici)1097-0290(19980805)59:3<344::aid-bit10>3.0.co;2-e
Subject(s) - electrodialysis , citric acid , chemistry , reversed electrodialysis , chromatography , energy consumption , membrane , biochemistry , electrical engineering , engineering
The effect of pH and temperature (θ) on the overall performance indicators ( i.e., solute recovery, ρ, and Faraday, η, efficiencies; specific energy consumption, ϵ, solute, J S , and water, J W , fluxes) of batch electrodialytic recovery of citric acid from model solutions was assessed at different values of feed solute concentration (c Sf ) and electric current density (j). Regardless of the initial feed concentration used, ρ and J S were found to be independent of θ; η and J W exhibited a positive trend with respect to θ, while ϵ a negative one. At the maximum temperature tested (33°C), as the pH of the feed solution was varied from 3 to 7, ρ increased from 0.90 ± 0.08 to 0.97 ± 0.02, η grew from 0.09 ± 0.02 to 0.50 ± 0.01, J S practically doubled, ϵ reduced about 8 times, but J W increased from 3 to 4 times. So, the optimal conditions for this technique are to be determined by balancing the savings in the investment and maintenance costs against the energy costs. © John Wiley & Sons, Inc. Biotechnol Bioeng 59:344–350, 1998.