Journal ArticleDOI
A high-performance membrane bioreactor for continuous fermentation of lactose to ethanol
Munir Cheryan,Mohamed A. Mehaia +1 more
TLDR
Productivity of the fermentation of lactose to ethanol by Kluyveromyces fragilis has been significantly improved by coupling a cross-flow membrane module to the primary fermentor in a semi-closed loop configuration.Abstract:
Productivity of the fermentation of lactose to ethanol byKluyveromyces fragilis has been significantly improved by coupling a cross-flow membrane module to the primary fermentor in a semi-closed loop configuration. At a cell concentration of 90g/L in the bioreactor and inlet lactose concentration of 150g/L, productivity was 240gETOH/L/hr at dilution rate of 6 hr-1. This was 80 times better than batch fermentation.read more
Citations
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Journal ArticleDOI
Fermentation of lactose to bio-ethanol by yeasts as part of integrated solutions for the valorisation of cheese whey
TL;DR: In this review, fermentation of lactose to ethanol is discussed, focusing on wild lactose-fermenting yeasts, particularly Kluyveromyces marxianus, and recombinant Saccharomyces cerevisiae strains, and emphasis is given on the latter advances in engineering S. cerevisia strains for efficient whey-to-ethanol bioprocesses.
Journal ArticleDOI
Butanol, ‘a superior biofuel’ production from agricultural residues (renewable biomass): recent progress in technology†
TL;DR: In this article, a review of bioconversion of plant materials such as wheat straw (WS), corn stover (CS), barley straw (BS), and switchgrass (SG) to butanol and process technology that converts these materials into this superior biofuel is presented.
Journal ArticleDOI
Bioconversions for whey utilization and waste abatement
TL;DR: In this paper, the authors show that higher BOD reductions can be achieved by combined processes, such as methane production from whey distillery effluents, but in most cases some aerobic treatment prior to final disposal is also required.
Journal ArticleDOI
Utilization of cheese whey powder (CWP) for ethanol fermentations: Effects of operating parameters
Fikret Kargi,Serpil Ozmihci +1 more
TL;DR: In this article, the effects of initial pH, CWP concentration and external nutrient (N, P) supplementation on ethanol formation rate and extent were investigated. And the most suitable initial pH was found to maximize the final ethanol yield.
Journal ArticleDOI
Microbial production of a biofuel (acetone-butanol-ethanol) in a continuous bioreactor: impact of bleed and simultaneous product removal.
TL;DR: It is demonstrated that ABE fermentation can be operated in an integrated continuous one-stage fermentation and product recovery system for a long period of time, if butanol and other microbial metabolites in the bioreactor are kept below threshold of toxicity.
References
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Journal ArticleDOI
The rotorfermentor. II. Application to ethanol fermentation
TL;DR: Calculations showed that the rotorfermentor may replace both a CST fermentor and cell centrifuge resulting in lower capital equipment costs and lower power consumption requirements.
Journal ArticleDOI
Continuous Enzymatic Modification of Proteins in an Ultrafiltration Reactor
W. David De Eslie,Munir Cheryan +1 more
TL;DR: The feasibility of producing protein hydrolyzates using an ultrafiltration (UF) reactor system was evaluated and the effect of operational parameters such as flow rate, reaction volume, substrate, and enzyme concentration on reactor product output and conversion were studied.
Journal ArticleDOI
High productivity ethanol fermentations with Zymomonas mobilis using continuous cell recycle
TL;DR: Cell recycle studies have been carried out with a strain of Zymomonas mobilis selected for its improved ethanol tolerance and faster rates of glucose uptake and ethanol production, demonstrating that ethanol concentrations of 60–65g/l can be sustained at productivities ranging from 120–200g/ l/h.
Journal ArticleDOI
A CSTR-hollow-fiber system for continuous hydrolysis of proteins. Factors affecting long-term stability of the reactor.
W. David Deeslie,Munir Cheryan +1 more
TL;DR: Factors affecting the long‐term operational stability of a CSTR‐hollow‐fiber reactor for continuous hydrolysis of proteins were studied and initial decay appears to be due to leakage of small active fragments of the enzyme mixture through the membrane, and later decay due to thermal degradation and loss of activators such as calcium through the membranes.
Journal ArticleDOI
Performance of a β-d-galactosidase hollow fibre reactor
David E. Kohlwey,Munir Cheryan +1 more
TL;DR: In this paper, a hollow fiber ultrafiltration module was used to immobilize β-d -Galactosidase in a hollow fibres and it was shown that the product of the reaction was significantly adsorbed by the fibres, which resulted in the reactor taking 10-30h to achieve steady-state.
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