Abstract
Purpose
Evaluation of the performance of a pilot-scale membrane system to separate and concentrate arabinoxylans, hydroxycinnamic acids and fermentable sugars from nejayote.
Methods
Total suspended solids (TSS) from nejayote were removed by a novel enzymatic process to avoid UF-membrane fouling (Asaff and Reyes 2015; modified to pilot-scale). The free-TSS nejayote was submitted to ultrafiltration and diafiltration processes (5 kDa MWCO polyethersulfone membrane) to separate and concentrate arabinoxylans. Reverse osmosis (cross-linked polyamide membrane) was performed to concentrate hydroxycinnamic acids and fermentable sugars (MW < 5 kDa) from ultrafiltration permeates.
Results
TSS remotion was highly efficient (final content < 15 ppm). The ultrafiltration permeate flux showed a linear decrease as the °Brix and volume reduction factor (VRF) increased (1.0–2.4). Furthermore, the ultrafiltration membrane, showed the highest rejection (72%) for long-chain arabinoxylans compared to hydroxycinnamic acids and sugars, therefore, their concentration (33.32 g/L) in the retentate was 1.8-fold higher than in the feed. Moreover, arabinoxylans were further purified to 83.2% diafiltering the retentate.
In contrast, the reverse osmosis permeate flux decreased exponentially as the °Brix and VRF increased, indicating a fouling phenomenon possibly due to molecular interactions of hydroxycinnamic acids, sugars, and their oligomers with the membrane surface. In this way, their concentrations in the retentate were almost 2-fold higher than in the feed.
Conclusion
The performance of the pilot-scale integrated membrane system showed that it is a technically feasible method to separate and concentrate compounds of industrial interest from nejayote despite the limitations related primarily to membrane fouling and adsorption of hydroxycinnamic acids.
Graphic Abstract
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Data Availability
All relevant data are included in the article and/or its supplementary information files.
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Acknowledgements
V. Contreras-Jácquez is thankful for the Mexican Council of Science and Technology (CONACyT) scholarship awarded and the helpful assistance from Dr. Waldo M. Argüelles-Monal and MSc. Luisa L. Silva-Gutiérrez.
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This work was financially supported by the Mexican Council of Science and Technology (CONACyT), Grant No. 2017–01-6267.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by VC-J and AA-T. The first draft of the manuscript was written by VC-J, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Contreras-Jácquez, V., Valenzuela-Vázquez, U., Grajales-Hernández, D.A. et al. Pilot-Scale Integrated Membrane System for the Separation and Concentration of Compounds of Industrial Interest from Tortilla Industry Wastewater (Nejayote). Waste Biomass Valor 13, 345–360 (2022). https://doi.org/10.1007/s12649-021-01530-x
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DOI: https://doi.org/10.1007/s12649-021-01530-x