Purification of bioethanol fermentation broth using hydrophilic PVA crosslinked PVDF-GO/TiO2 membrane

doi:10.1016/j.cjche.2022.04.028

Abstract

Abstract: The presence of impurities in the bioethanol fermentation broth should be removed to mitigate any possible ineffective refining processes as well as to enhance bioethanol production. In this study, a pre-filtration process was carried out for separating fermentation yeast cells and residual substrates using a microfiltration membrane. Hydrophilic polyvinylidene fluoride-graphene oxide/titanium dioxide (PVDF-GO/TiO₂) membrane with polyvinyl alcohol (PVA) surface-coating modification was fabricated and characterized. Membrane modification attempts have succeeded in increasing the hydrophilicity as indicated by contact angle decline from 72.10° to 34.83° and affinity towards water leading to higher water permeability. The performance evaluation showed that 90.77% of unwanted by-products (yeast cells and residual substrate) can be removed. This high rejection is also followed by a high and stable flux performance at 40.20 L·m^-2·h^-1 where the flux was increased by 13 times compared to that of the neat membrane. The PVA-coated PVDF-GO/TiO₂ showed the best anti-biofouling performance with a flux recovery ratio after 5 days incubation (FRR_5d) of 93.55%. This membrane material has excellent prospects in future membrane development for either in-situ application or as a pre-filtration in the fermentation process to separate living cells and residual substrates before being further processed in the refining processes.

Key words: Biofuel, Membranes, Fermentation, Filtration, Separation, Selectivity

摘要： The presence of impurities in the bioethanol fermentation broth should be removed to mitigate any possible ineffective refining processes as well as to enhance bioethanol production. In this study, a pre-filtration process was carried out for separating fermentation yeast cells and residual substrates using a microfiltration membrane. Hydrophilic polyvinylidene fluoride-graphene oxide/titanium dioxide (PVDF-GO/TiO₂) membrane with polyvinyl alcohol (PVA) surface-coating modification was fabricated and characterized. Membrane modification attempts have succeeded in increasing the hydrophilicity as indicated by contact angle decline from 72.10° to 34.83° and affinity towards water leading to higher water permeability. The performance evaluation showed that 90.77% of unwanted by-products (yeast cells and residual substrate) can be removed. This high rejection is also followed by a high and stable flux performance at 40.20 L·m^-2·h^-1 where the flux was increased by 13 times compared to that of the neat membrane. The PVA-coated PVDF-GO/TiO₂ showed the best anti-biofouling performance with a flux recovery ratio after 5 days incubation (FRR_5d) of 93.55%. This membrane material has excellent prospects in future membrane development for either in-situ application or as a pre-filtration in the fermentation process to separate living cells and residual substrates before being further processed in the refining processes.

关键词: Biofuel, Membranes, Fermentation, Filtration, Separation, Selectivity

Tutuk Djoko Kusworo, Monica Yulfarida, Andri Cahyo Kumoro, Dani Puji Utomo. Purification of bioethanol fermentation broth using hydrophilic PVA crosslinked PVDF-GO/TiO₂ membrane[J]. Chinese Journal of Chemical Engineering, 2023, 55(3): 123-136.

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Purification of bioethanol fermentation broth using hydrophilic PVA crosslinked PVDF-GO/TiO₂ membrane

Purification of bioethanol fermentation broth using hydrophilic PVA crosslinked PVDF-GO/TiO₂ membrane

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