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1.
Renewables in buildings and local communities
Henrik Gjerkeš, invited lecture at foreign university

Found in: ključnih besedah
Summary of found: ... Renewable energy sources, sustainable development, buildings, local communities...
Keywords: Renewable energy sources, sustainable development, buildings, local communities
Published: 03.12.2020; Views: 665; Downloads: 0
.pdf Fulltext (2,50 MB)

2.
Anaerobic treatment of excess yeast and waste ethanol from alcohol free beer production for increase of renewable energy use in brewing industry
Goran Lukić, Mario Panjicko, Gregor Drago Zupančič, 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.
Found in: ključnih besedah
Keywords: anaerobic digestion, biogas, brewery yeast, renewable energy, waste ethanol
Published: 10.06.2021; Views: 356; Downloads: 3
.pdf Fulltext (825,82 KB)
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3.
An economic analysis of biomass potential as an opportunity to increase the share of biogas production for energy purposes in Slovenia
Stefan Dabižljević, 2021, master's thesis

Abstract: One of the biggest global problems, the solution of being put in front of the scientists around the world, is endangering the environment. To preserve it, the transition from non-renewable to renewable energy sources is a rational and necessary solution. One of the energy sources with great potential in the future is biomass. In the master’s thesis, we have studied the economic analysis of the possibility of obtaining energy from biogas in Slovenia for the production of which biomass is used. For the study to be successful, it was necessary to analyse the situation in the field of renewable energy sources and biogas in the European Union and Slovenia to obtain a general picture for further analysis. By analysing the available data from previous years, we gained insight into the situation in the given area. The master’s thesis aims to show that although Slovenia has been facing the problem of a decreasing number of biogas power plants for years, the implementation of a system for obtaining energy from biogas is an economically and environmentally viable investment. The economic analysis was done for a 1 MW plant. The choice of plant size and power was made based on the Kepner-Tregoe method and the method of comparing alternatives. For the project duration of 30 years, through cash flows, as well as through various economic indicators, such as the presentation of loan calculations with a certain interest rate, internal rate of return, repayment period method, present project value, etc., the economic side of the investment is presented, which aims to show the profitability of the project.
Found in: ključnih besedah
Summary of found: ...environment. To preserve it, the transition from non- renewable to renewable energy sources is a rational...
Keywords: Renewable energy sources, biomass, biogas, economic analysis, investment, project
Published: 07.09.2021; Views: 247; Downloads: 15
URL Fulltext (0,00 KB)
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