FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W266932> ?p ?o ?g. }

• W266932 abstract "Lignocellulosic biomass is a potential feedstock for production of sugars, which can be fermented into ethanol. The work presented in this thesis proposes some solutions to overcome problems with suboptimal process performance due to elevated cultivation temperatures and inhibitors present during ethanol production from lignocellulosic materials. In particular, continuous processes operated at high dilution rates with high sugar utilisation are attractive for ethanol fermentation, as this can result in higher ethanol productivity. Both encapsulation and membrane bioreactors were studied and developed to achieve rapid fermentation at high yeast cell density.My studies showed that encapsulated yeast is more thermotolerant than suspended yeast. The encapsulated yeast could successfully ferment all glucose during five consecutive batches, 12 h each at 42 °C. In contrast, freely suspended yeast was inactivated already in the second or third batch. One problem with encapsulation is, however, the mechanical robustness of the capsule membrane. If the capsules are exposed to e.g. high shear forces, the capsule membrane may break. Therefore, a method was developed to produce more robust capsules by treating alginate-chitosan-alginate (ACA) capsules with 3-aminopropyltriethoxysilane (APTES) to get polysiloxane-ACA capsules. Of the ACA-capsules treated with 1.5% APTES, only 0–2% of the capsules broke, while 25% of the untreated capsules ruptured within 6 h in a shear test. In this thesis membrane bioreactors (MBR), using either a cross-flow or a submerged membrane, could successfully be applied to retain the yeast inside the reactor. The cross-flow membrane was operated at a dilution rate of 0.5 h-1 whereas the submerged membrane was tested at several dilution rates, from 0.2 up to 0.8 h-1. Cultivations at high cell densities demonstrated an efficient in situ detoxification of very high furfural levels of up to 17 g L-1 in the feed medium when using a MBR. The maximum yeast density achieved in the MBR was more than 200 g L-1. Additionally, ethanol fermentation of nondetoxified spruce hydrolysate was possible at a high feeding rate of 0.8 h-1 by applying a submerged membrane bioreactor, resulting in ethanol productivities of up to 8 g L-1 h-1. In conclusion, this study suggests methods for rapid continuous ethanol production even at stressful elevated cultivation temperatures or inhibitory conditions by using encapsulation or membrane bioreactors and high cell density cultivations." @default.
• W266932 created "2016-06-24" @default.
• W266932 creator A5013508140 @default.
• W266932 date "2014-01-01" @default.
• W266932 modified "2023-09-26" @default.
• W266932 title "Concepts for improving ethanol productivity from lignocellulosic materials : encapsulated yeast and membrane bioreactors" @default.
• W266932 cites W142573693 @default.
• W266932 cites W1467406035 @default.
• W266932 cites W1505046615 @default.
• W266932 cites W1520282317 @default.
• W266932 cites W1521670822 @default.
• W266932 cites W1549982529 @default.
• W266932 cites W1556319746 @default.
• W266932 cites W1603056738 @default.
• W266932 cites W1691983155 @default.
• W266932 cites W1806143782 @default.
• W266932 cites W1839898530 @default.
• W266932 cites W1964281642 @default.
• W266932 cites W1964649535 @default.
• W266932 cites W1968290246 @default.
• W266932 cites W1968499092 @default.
• W266932 cites W1972069428 @default.
• W266932 cites W1974022376 @default.
• W266932 cites W1976247623 @default.
• W266932 cites W1977933096 @default.
• W266932 cites W1979400540 @default.
• W266932 cites W1981213007 @default.
• W266932 cites W1982511929 @default.
• W266932 cites W1983385880 @default.
• W266932 cites W1983878419 @default.
• W266932 cites W1987666588 @default.
• W266932 cites W1988079922 @default.
• W266932 cites W1989706478 @default.
• W266932 cites W1989743884 @default.
• W266932 cites W1996396905 @default.
• W266932 cites W1996872492 @default.
• W266932 cites W1997164908 @default.
• W266932 cites W1998678977 @default.
• W266932 cites W2001362170 @default.
• W266932 cites W2001558952 @default.
• W266932 cites W2001570672 @default.
• W266932 cites W2002299221 @default.
• W266932 cites W2002416 @default.
• W266932 cites W2003611970 @default.
• W266932 cites W2005732447 @default.
• W266932 cites W2007484134 @default.
• W266932 cites W2008148751 @default.
• W266932 cites W2009851896 @default.
• W266932 cites W2013510138 @default.
• W266932 cites W2014263680 @default.
• W266932 cites W2014898375 @default.
• W266932 cites W2017654058 @default.
• W266932 cites W2018468508 @default.
• W266932 cites W2020330274 @default.
• W266932 cites W2021705167 @default.
• W266932 cites W2022304418 @default.
• W266932 cites W2023209747 @default.
• W266932 cites W2023395591 @default.
• W266932 cites W2025243559 @default.
• W266932 cites W2025767447 @default.
• W266932 cites W2026761541 @default.
• W266932 cites W2026877058 @default.
• W266932 cites W2027077942 @default.
• W266932 cites W2027700190 @default.
• W266932 cites W2027966927 @default.
• W266932 cites W2029308723 @default.
• W266932 cites W2029763377 @default.
• W266932 cites W2030381803 @default.
• W266932 cites W2030716085 @default.
• W266932 cites W2033628493 @default.
• W266932 cites W2033932941 @default.
• W266932 cites W2034795938 @default.
• W266932 cites W2035681245 @default.
• W266932 cites W2036235992 @default.
• W266932 cites W2038445570 @default.
• W266932 cites W2040378517 @default.
• W266932 cites W2041048626 @default.
• W266932 cites W2042041039 @default.
• W266932 cites W2042757313 @default.
• W266932 cites W2043374634 @default.
• W266932 cites W2044523596 @default.
• W266932 cites W2044917474 @default.
• W266932 cites W2045394477 @default.
• W266932 cites W2047100544 @default.
• W266932 cites W2047529017 @default.
• W266932 cites W2048744522 @default.
• W266932 cites W2051674492 @default.
• W266932 cites W2053526929 @default.
• W266932 cites W2057396845 @default.
• W266932 cites W2058669706 @default.
• W266932 cites W2058929656 @default.
• W266932 cites W2066939890 @default.
• W266932 cites W2066982837 @default.
• W266932 cites W2067026446 @default.
• W266932 cites W2067916249 @default.
• W266932 cites W2069492269 @default.
• W266932 cites W2069549254 @default.
• W266932 cites W2071179480 @default.
• W266932 cites W2071515363 @default.
• W266932 cites W2072261755 @default.

• next