1. |
2. Anaerobic treatment of excess yeast and waste ethanol from alcohol free beer production for increase of renewable energy use in brewing industryGregor Drago Zupančič, Mario Panjicko, Goran Lukić, 2020, published scientific conference contribution 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
Published in RUNG: 10.06.2021; Views: 3795; Downloads: 14
 Link to full text
This document has many files! More... |
3. Designing new renewable nano-structured electrode and membrane materials for direct alkaline ethanol fuel cell : Conductivity mechanism information on cross-linked self-standing graphene-polysaccharide derivate membranes and their laminated composites with commercial synthetic membranesEgon Pavlica, Ahmed Kreta, Gvido Bratina, final research report Keywords: graphene, chitosan, polysaccharide, fuel cell, alkaline, ethanol, photoconductivity, ionic conductivity, mixed-conductor model
Published in RUNG: 03.12.2020; Views: 3966; Downloads: 0
This document has many files! More... |
4. Designing new renewable nano-structured electrode and membrane materials for direct alkaline ethanol fuel cell : Provided graphene derivates and their cross-linked nanostructured membranes detailed structure informationEgon Pavlica, Ahmed Kreta, Gvido Bratina, final research report Keywords: graphene, membrane, chitosan, polysaccharide, fuel cell, alkaline, ethanol, morphology, elemental analysis
Published in RUNG: 03.12.2020; Views: 4078; Downloads: 0
This document has many files! More... |
5. Designing new renewable nano-structured electrode and membrane materials for direct alkaline ethanol fuel cell : Information on catalytic activity, structure and electric current con- ductivity of new catalysts on supporting substratesEgon Pavlica, Gvido Bratina, Jørgen Svendby, Qingjun Chen, Jia Yang, De Chen, Ji-Song Huang, Jessie Lue Shingjiang, 2020, final research report Keywords: fuel cell, ethanol oxidation, graphene, oxygen reduction, catalyst, pt-free, electrochemical impedance spectroscopy
Published in RUNG: 03.12.2020; Views: 4470; Downloads: 0
This document has many files! More... |
6. Absorption Spectra of Ethanol and Water Using a Photothermal Lens SpectrophotometerHumberto Cabrera, Jehan Akbar, Dorota Korte, Imrana Ashraf, Evelio E. Ramírez- Miquet, Ernesto Marin, Joseph Niemela, 2018, original scientific article Keywords: Thermal lens spectrometry, TLS, absorption of water, absorption of ethanol, vibration overtones
Published in RUNG: 08.06.2018; Views: 6002; Downloads: 0
This document has many files! More... |
