DOI: 10.5281/zenodo.18495090
title: Dataset associated with the paper "Recovery and fractionation of volatile fatty acids from fermented solutions by electrodialysis: electrochemical characterization of anion-exchange membranes"

description: This dataset contains experimental results on the separation and recovery of volatile fatty acids (acetic, propionic, butyric, and valeric acids) by electrodialysis using different anion-exchange membranes.

The data include extraction efficiencies, fractionation degrees, and electrochemical measurements obtained by linear sweep voltammetry and chronopotentiometry. Results are provided for three diferente membranes (Ralex AMH-PES, Fumasep FAS-PET-130, and PC200D).

These data are suitable for studies on VFA recovery, membrane selectivity, and electrodialysis optimization for biopolymer precursor production.

The data used to generate the figures are provided in the corresponding Excel worksheets. Each dataset is specified below.

Figure 2: Representative LSVs of the AEMs/solution system for (a) Ralex, (b) Fumasep and (c) PC200D. The solutions contained each VFA separately and all VFAs simultaneously at initial pH 6.

Figure 3a: Representative ChPs of the membrane/solution systems obtained for Ralex. The solution was composed of all VFAs at initial pH 6.

Figure 3b: Representative ChPs of the membrane/solution systems obtained for Fumasep. The solution was composed of all VFAs at initial pH 6.

Figure 3c: Representative ChPs of the membrane/solution systems obtained for PC200D. The solution was composed of all VFAs at initial pH 6.

Figure 4:  Representative PE% obtained with the Ralex membrane under (a) 0 V, (b) 1.72 V, (c) 2.35 V, (d) 2.45 V, (e) 2.66 V and (f) 2.88 V throughout 7 hours of electrodialysis.

Figure 5:  Representative PE% obtained with the Fumasep membrane under (a) 0 V, (b) 1.72 V, (c) 2.35 V, (d) 2.45 V, (e) 2.66 V and (f) 2.88 V throughout 7 hours of electrodialysis.

Figure 6:  Representative PE% obtained with the PC200D membrane under (a) 0 V, (b) 1.72 V, (c) 2.35 V, (d) 2.45 V, (e) 2.66 V and (f) 2.88 V throughout 7 hours of electrodialysis.

Figure 7:  Representative flux obtained with the Ralex membrane under (a) 0 V, (b) 1.72 V, (c) 2.35 V, (d) 2.45 V, (e) 2.66 V and (f) 2.88 V throughout the electrodialysis.

Figure 8:  Representative flux obtained with the Fumasep membrane under (a) 0 V, (b) 1.72 V, (c) 2.35 V, (d) 2.45 V, (e) 2.66 V and (f) 2.88 V throughout the electrodialysis.

Figure 9:  Representative flux obtained with the PC200D membrane under (a) 0 V, (b) 1.72 V, (c) 2.35 V, (d) 2.45 V, (e) 2.66 V and (f) 2.88 V throughout the electrodialysis.

Figure 10: Representative pH time profiles of the feed (a,b,c) and receiver (d,e,f) solutions obtained under application of distinct cell voltage values (0 V – 2.88 V) with Ralex, Fumasep and PC200D membranes.

Figure S2: Representative Cowan-Brown curves obtained for the (a) Ralex, (b) Fumasep and (c) PC200D membranes with the solution containing each VFA separately.

Figure S3: Representative Cowan-Brown curves obtained for the (a) Ralex, (b) Fumasep and (c) PC200D membranes with the solution containing all VFAs.

Figure S4: Representative LSV curve for the ED stack obtained with Ralex membrane.

Figure S5: Representative PE% obtained with the Ralex membrane under (a) 0V, (b) 1.72V, (c) 2.22V, (d) 2.35V, (e) 2.45V, (f) 2.66V, (g) 2.74V, (h) 2.82V, and (i) 2.88V throughout 7 hours of electrodialysis.

Figure S6: Representative PE% obtained with the Fumasep membrane under (a) 0V, (b) 1.72V, (c) 2.22V, (d) 2.35V, (e) 2.45V, (f) 2.66V, (g) 2.74V, (h) 2.82V, and (i) 2.88V throughout 7 hours of electrodialysis.

Figure S7: Representative PE% obtained with the PC200D membrane under (a) 0V, (b) 1.72V, (c) 2.22V, (d) 2.35V, (e) 2.45V, (f) 2.66V, (g) 2.74V, (h) 2.82V, and (i) 2.88V throughout 7 hours of electrodialysis.

Figure S8: Representative flux obtained with the Ralex membrane under (a) 0V, (b) 1.72V, (c) 2.22V, (d) 2.35V, (e) 2.45V, (f) 2.66V, (g) 2.74V, (h) 2.82V, and (i) 2.88V throughout 7 hours of electrodialysis.

Figure S9: Representative flux obtained with the Fumasep membrane under (a) 0V, (b) 1.72V, (c) 2.22V, (d) 2.35V, (e) 2.45V, (f) 2.66V, (g) 2.74V, (h) 2.82V, and (i) 2.88V throughout 7 hours of electrodialysis.

Figure S10: Representative flux obtained with the PC200D membrane under (a) 0V, (b) 1.72V, (c) 2.22V, (d) 2.35V, (e) 2.45V, (f) 2.66V, (g) 2.74V, (h) 2.82V, and (i) 2.88V throughout 7 hours of electrodialysis.

Figure S11: Representative conductivity profile of the feed (a,b,c) and receiver (d,e,f) solutions obtained under application of distinct voltage values (0V – 2.88V) with the Ralex, Fumasep and PC200D membranes.