Kinetic modelling of continuous production of ethanol from cheese whey

Ghaly, A. E.; El-Taweel, A. A.

doi:10.1016/s0961-9534(97)00012-3

Cited by 49 publications

(37 citation statements)

References 20 publications

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“…Further increase in the HRT from 24 to 48 h resulted in the highest lactose utilization of 95%. Similar results obtained Ghaly & El-Taweel (1997). They observed 98% lactose utilization for continuous fermentation from cheese whey with 50 g L -1 initial lactose concentration at the HRT of 42 h using the yeast strain of Candida pseudotropicalis.…”

Section: Resultssupporting

confidence: 86%

“…They observed 98% lactose utilization for continuous fermentation from cheese whey with 50 g L -1 initial lactose concentration at the HRT of 42 h using the yeast strain of Candida pseudotropicalis. Kargi & Ozmihci (2006) According to Ghaly & El-Taweel (1997) lower lactose fermentation efficiency under low HRT could be attributed to the cell washout phenomenon and the low cell numbers in the reactor chamber. To remove this problem, during this experiment, the reactors were provided with G-L-S separator and the immobilization of yeast culture was done.…”

Section: Resultsmentioning

confidence: 99%

“…Silveira et al (2005) fermented the solution of UF whey permeate in batch cultures. Ghaly & El-Taweel (1997) developed a kinetic model for continuous ethanol fermentation from lactose. Moreover, in 2008 there were two industrial scale whey-ethanol plants in the United States which produced 8 million gallons of fuel ethanol per year (Ling, 2008).…”

Section: Bioethanol Productionmentioning

confidence: 99%

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Feasibility of Bioenergy Production from Ultrafiltration Whey Permeate Using the UASB Reactors

Kisielewska¹

2012

Biogas

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Bioethanol Productionmentioning

confidence: 99%

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Feasibility of Bioenergy Production from Ultrafiltration Whey Permeate Using the UASB Reactors

Kisielewska¹

2012

Biogas

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“…K. marxianus has been studied extensively for utilization of whey, e.g. : the effect of multiple substrates in ethanol fermentation from cheese whey [17], ethanol production from crude whey [19], batch fermentation [1,18], fed-batch fermentation [1,9,15], continuous fermentations [4,11,12], studies on cheese whey powder [6,[11][12][13][14], immobilization of thermotolerant yeast on delignified cellulosic materials [7], and alginate-immobilized yeast cells [2,3,10]. It has been found that, when using alginate-immobilized cells, cell flush-out is avoided and also the production of ethanol is raised compared with ethanol production from free cells [3].…”

Section: Introductionmentioning

confidence: 99%

Production of bioethanol from organic whey using Kluyveromyces marxianus

Christensen¹,

Kádár²,

Oleśkowicz-Popiel³

et al. 2010

J Ind Microbiol Biotechnol

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Ethanol production by K. marxianus in whey from organic cheese production was examined in batch and continuous mode. The results showed that no pasteurization or freezing of the whey was necessary and that K. marxianus was able to compete with the lactic acid bacteria added during cheese production. The results also showed that, even though some lactic acid fermentation had taken place prior to ethanol fermentation, K. marxianus was able to take over and produce ethanol from the remaining lactose, since a significant amount of lactic acid was not produced (1-2 g/l). Batch fermentations showed high ethanol yield (~0.50 g ethanol/g lactose) at both 30°C and 40°C using low pH (4.5) or no pH control. Continuous fermentation of nonsterilized whey was performed using Ca-alginate-immobilized K. marxianus. High ethanol productivity (2.5-4.5 g/l/h) was achieved at dilution rate of 0.2/h, and it was concluded that K. marxianus is very suitable for industrial ethanol production from whey.

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“…Because of cow milk being the worldwide leading raw material for cheese production, bovine whey embodies the major fraction of the global whey quantity (62). In addition to countries of the Northern world hemisphere, increasing volumes of whey are currently also generated in southern countries; for example, 270,000 tons annually are generated in India, constituting a real waste stream there without any further use (63).…”

Section: Wheypol -Using a Side Stream Of Cheese Making Industry For Pmentioning

confidence: 99%

Advanced approaches to produce polyhydroxyalkanoate (PHA) biopolyesters in a sustainable and economic fashion

Koller

Braunegg

2018

The EuroBiotech Journal

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Polyhydroxyalkanoates (PHA), the only group of "bioplastics" sensu stricto, are accumulated by various prokaryotes as intracellular "carbonosomes". When exposed to exogenous stress or starvation, presence of these microbial polyoxoesters of hydroxyalkanoates assists microbes to survive."Bioplastics" such as PHA must be competitive with petrochemically manufactured plastics both in terms of material quality and manufacturing economics. Cost-effectiveness calculations clearly show that PHA production costs, in addition to bioreactor equipment and downstream technology, are mainly due to raw material costs. The reason for this is PHA production on an industrial scale currently relying on expensive, nutritionally relevant "1 st -generation feedstocks", such as like glucose, starch or edible oils. As a way out, carbon-rich industrial waste streams ("2 nd -generation feedstocks") can be used that are not in competition with the supply of food; this strategy not only reduces PHA production costs, but can also make a significant contribution to safeguarding food supplies in various disadvantaged parts of the world. This approach increases the economics of PHA production, improves the sustainability of the entire lifecycle of these materials, and makes them unassailable from an ethical perspective.In this context, our EU-funded projects ANIMPOL and WHEYPOL, carried out by collaborative consortia of academic and industrial partners, successfully developed PHA production processes, which resort to waste streams amply available in Europe. As real 2 nd -generation feedstocks", waste lipids and crude glycerol from animal-processing and biodiesel industry, and surplus whey from dairy and cheese making industry were used in these processes. Cost estimations made by our project partners determine PHA production prices below 3 € (WHEYPOL) and even less than 2 € (ANIMPOL), respectively, per kg; these values already reach the benchmark of economic feasibility.The presented studies clearly show that the use of selected high-carbon waste streams of (agro)industrial origin contributes significantly to the cost-effectiveness and sustainability of PHA biopolyester production on an industrial scale.

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Kinetic modelling of continuous production of ethanol from cheese whey

Cited by 49 publications

References 20 publications

Feasibility of Bioenergy Production from Ultrafiltration Whey Permeate Using the UASB Reactors

Feasibility of Bioenergy Production from Ultrafiltration Whey Permeate Using the UASB Reactors

Production of bioethanol from organic whey using Kluyveromyces marxianus

Advanced approaches to produce polyhydroxyalkanoate (PHA) biopolyesters in a sustainable and economic fashion

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