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 prefiltration pro...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 prefiltration 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/TiO_(2)) 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/TiO2showed the best anti-biofouling performance with a flux recovery ratio after 5 days incubation(FRR5d) 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.展开更多
基金financialy supported by Directorate of Research and Community Service, Deputy for Strengthening Research and Development, Ministry of Research and Technology/National Research and Innovation Agency of Indonesia (8/E1/ KPT/2021) with research agreement contract (225-29/UN7.6.1/ PP/2021)。
文摘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 prefiltration 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/TiO_(2)) 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/TiO2showed the best anti-biofouling performance with a flux recovery ratio after 5 days incubation(FRR5d) 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.
