Concentration Enrichment of Fermentation Derived Acetic Acid: Transport Modeling of Forward Osmosis-Nanofiltration Integrated System

2019 ◽  
Vol 15 (1) ◽  
Author(s):  
Jayato Nayak ◽  
Parimal Pal ◽  
Zunipa Roy ◽  
Sankha Chakrabortty ◽  
Pinaki Dey ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Concentration Polarization ◽  
Transport Model ◽  
Acid Output ◽  
Forward Osmosis ◽  
Integrated System ◽  
High Concentration ◽  
Excellent Performance ◽  
Production Scheme ◽  
Internal Concentration

Abstract Forward Osmosis (FO)-Nanofiltration (NF) integration as the final product polishing step enables high concentration of acetic acid output through continuous dehydration of fermentation derived product. A mathematical transport model has been developed based on external and internal concentration polarization modulus of FO and extended Nernst–Plank equation for NF to capture the flux and rejection trends from those membranes. The modular designed production scheme ensured high flux (45 Lm−2 h−1), concentration (962 g L−1) and purity (>98 %) of acetic acid under non-neutralization condition. Excellent performance of the model is reflected in low relative error (<0.05), high Willmott d-index (>0.97) and high correlation coefficient (>0.98).

Modeling of external and internal concentration polarization effect on flux behaviour of forward osmosis

2008 ◽  
Vol 8 (5) ◽  
pp. 533-539 ◽  
Author(s):  
C. H. Tan ◽  
H. Y. Ng
Keyword(s):  
Excellent Agreement ◽  
Polarization Effect ◽  
Concentration Polarization ◽  
Transport Model ◽  
Water Flux ◽  
Forward Osmosis ◽  
Selective Membrane ◽  
Internal Concentration ◽  
Internal Concentration Polarization ◽  
The Impact

The forward osmosis process has recently gained more interest from researchers and is being viewed as an alternative to various membrane processes. The primary challenge in developing the process is the severity of both external and internal concentration polarizations, which significantly reduce the water flux across the highly selective membrane. This study investigates the impact of concentration polarization on flux behaviour. A model adopted from the boundary layer concept was used to describe the external concentration polarization effect. A previously developed model for the internal concentration polarization was further improved from the governing convective-diffusion equations, to achieve a better transport model that was in excellent agreement with experimental flux data. Laboratory experiments were carried out to account for both the external and internal concentration polarization and the associated water flux was verified with the improved models. Results showed excellent agreement for both models, which were used to describe external and internal concentration polarization, and these modified models were more accurate than previously used models.

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