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Abstract

In this study, batch fermentation of glucose to ethanol by Saccharomyces cerevisiae (ATCC 7754) was carried out using 2.5 dm3 BioFlo®115 bioreactor. The main objective of this study was to investigate the kinetics of ethanol fermentation by means of the non-structured model. The fermentation process was carried out for 72 h. Samples were collected every 4 h and then yeast growth concentration of ethanol and glucose were measured. The mathematical model was composed of three equations, which represented the changes of biomass, substrate and ethanol concentrations. The mathematical model of bioprocess was solved by means of Matlab/SimulinkTM environment. The obtained results from the proposed model showed good agreement with the experimental data, thus it was concluded that this model can be used for the mathematical modeling of ethanol production.

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Authors and Affiliations

Anna Konopacka
Maciej Konopacki
Marian Kordas
Rafał Rakoczy
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Abstract

This paper presents investigations on the removal of cyclohexane and ethanol from air in polyurethane- -packed biotrickling filters, inoculated with Candida albicans and Candida subhashii fungal species. Results on process performance together with flow cytometry analyses of the biofilm formed over packing elements are presented and discussed. The results indicate that the presence of ethanol enhances the removal efficiency of cyclohexane from air. This synergistic effect may be attributed to both co-metabolism of cyclohexane with ethanol as well as increased sorption efficiency of cyclohexane to mineral salt medium in the presence of ethanol. Maximum elimination capacities of 89 g m-3 h-1 and 36.7 g m-3 h-1 were noted for cyclohexane and ethanol, respectively, when a mixture of these compounds was treated in a biofilter inoculated with C. subhashii. Results of flow cytometry analyses after 100 days of biofiltration revealed that about 91% and 88% of cells in biofilm remained actively dividing, respectively for C. albicans and C. subhashii species, indicating their good condition and ability to utilize cyclohexane and ethanol as a carbon source.
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Authors and Affiliations

Piotr Rybarczyk
1
ORCID: ORCID
Milena Marycz
1
Bartosz Szulczyński
1
ORCID: ORCID
Anna Brillowska-Dąbrowska
2
Agnieszka Rybarczyk
3
Jacek Gębicki
1
ORCID: ORCID

  1. Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology
  2. Department of Molecular Biotechnology and Microbiology, Faculty of Chemistry, Gdańsk University of Technology
  3. Department of Histology, Faculty of Medicine, Medical University of Gdańsk

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