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Title:Anaerobic treatment of excess yeast and waste ethanol from alcohol free beer production for increase of renewable energy use in brewing industry
Authors:Zupančič, Gregor Drago (Author)
Panjicko, Mario (Author)
Lukić, Goran (Author)
Files:URL https://www.sarajevo2020.sdewes.org/programme
 
Language:English
Work type:Unknown ()
Tipology:1.08 - Published Scientific Conference Contribution
Organization:UNG - University of Nova Gorica
Abstract:In the presented paper we have investigated how large quantities of excess yeast and periodical releases of waste ethanol influence the operation of the anaerobic treatment process in a UASB reactor. The process was tested in a pilot-scale reactor with a design organic load of 16.0 kg/m3/day of COD. Through various stages of the experiment, several possible scenarios were tested, excess yeast was added continuously with concentrations up to 3 vol. %, whereas waste ethanol was added in batches of up to 0.8 % of daily volume load several days a week. The intent was to test real conditions in the treatment process. The whole experiment lasted for 77 days, where the maximum organic load of 24.72 kg/m3/day was successfully achieved with no adverse effects on the efficiency of the reactor performance although it significantly surpassed the design load. The COD efficiency at maximum OLR was 83.1 %, whereas the average was 88.0 %. The average biogas production rate increased from 2,044 m3/m3/day to 4.927 m3/m3/day. The microbial community structure analysis showed significant shifts only in the archaeal community (25 – 30 %) as a good adaptation to the addition of substrates. Monitoring the model brewery in applying the addition of yeast and ethanol to the wastewater treatment showed a 110 % increase in biomethane production. The consequence of the increased biomethane production is that the natural gas substitute ratio could be increased from the current average of 10.7 % to potentially 20.1 %, which is a substantial step towards the goal of renewable energy use.
Keywords:anaerobic digestion, biogas, brewery yeast, renewable energy, waste ethanol
Year of publishing:2020
Number of pages:Str. [1-13]
COBISS_ID:66593795 Link is opened in a new window
UDC:54
URN:URN:SI:UNG:REP:FPVRZ8HA
Views:373
Downloads:3
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Record is a part of a monograph

Title:4th SEE SDEWES Conference Sarajevo
Subtitle:[digital proceedings]
Publisher:SDEWES
COBISS.SI-ID:29485315 New window
Collection title:USB proceedings (Conference on Sustainable Development of Energy, Water and Environment Systems)
Collection numbering:1847-7178
Place of publishing:[S. l.]
Year of publishing:2020
Editors:Marko Ban

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