| Title: | Anaerobic treatment of excess yeast and waste ethanol from alcohol free beer production for increase of renewable energy use in brewing industry |
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| Authors: | ID Zupančič, Gregor Drago (Author)
ID Panjicko, Mario (Author)
ID Lukić, Goran (Author) |
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| Files: |  https://www.sarajevo2020.sdewes.org/programme
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.08 - Published Scientific Conference Contribution |
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| Organization: | UNG - University of Nova Gorica
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| 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. |
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| Keywords: | anaerobic digestion, biogas, brewery yeast, renewable energy, waste ethanol |
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| Year of publishing: | 2020 |
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| Number of pages: | Str. [1-13] |
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| PID: | 20.500.12556/RUNG-6583  |
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| COBISS.SI-ID: | 66593795 |
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| UDC: | 54 |
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| NUK URN: | URN:SI:UNG:REP:FPVRZ8HA |
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| Publication date in RUNG: | 10.06.2021 |
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| Views: | 3325 |
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| Downloads: | 12 |
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| Metadata: |    |
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