Luljeta Pinguli – University of Tirana, Faculty of Natural Sciences, Department of Industrial Chemistry, Blvd. Zogu I. Tirana, Albania

Ilirjan Malollari – University of Tirana, Faculty of Natural Sciences, Department of Industrial Chemistry, Blvd. Zogu I. Tirana, Albania

Keywords:                  Brewer’s spent grain (BSG);
Recovery and recycle;
Pretreatment methods


Abstract: Brewer’s spent grain (BSG) is a raw material produced during beer production that has a high potential for sustainable reuse. BSG is con­sidered an important feedstock for producing several products. Brewer’s spent grain (BSG) is the main by-product obtained after wort production commonly used as animal feed. Recently research work has focused on ap­plication in different areas, because of BSG’s low cost, large availability, and valuable chemical composition. Brewer’s spent grain forms 85% of the total by-products generated.

Of the breweries that produce potential by-products, their recovery is an­other cost-effective pollution prevention option that can provide a facili­ty with significant economic benefits while simultaneously reducing waste production.

BSG water content is around 80 – 85 %. Dry BSG content has around 60-63% hemicellulose, cellulose, and lignin, protein content is around 22-25%, lipids 8-9%, phenolic compounds 1.7-2%, ash 2.5%.

In Albania spent grain is used as feed for animals without any other pre­treatment. Our experiment is focused on spent grain pretreatment and sta­bilization techniques to extend BSG’s life. BSG pretreatment/stabilization techniques can be employed as a function of their future destination such as energy production, food additives production, using BSG as a substrate for enzyme production, etc. In this paper, we have used three different pretreat­ment/stabilization procedures. Thin layer drying technique, alginate treat­ment of BSG, and vacuum filtration of BSG with cold and hot water. For each sample, we have monitored drying kinetics based on the remaining water content and BSG’s life.

9th International Scientific ERAZ Conference – ERAZ 2023 – Conference Proceedings: KNOWLEDGE BASED SUSTAINABLE DEVELOPMENT, hybrid – online, virtually and in person, Prague, Czech Republic, June 1, 2023

ERAZ Conference Proceedings published by: Association of Economists and Managers of the Balkans – Belgrade, Serbia

ERAZ conference partners: Faculty of Logistics, University of Maribor, Maribor (Slovenia); University of National and World Economy – UNWE, Sofia (Bulgaria); Center for Political Research and Documentation (KEPET), Research Laboratory of the Department of Political Science of University of Crete (Greece); Institute of Public Finance – Zagreb (Croatia); Faculty of Tourism and Hospitality Ohrid, University of St. Kliment Ohridski from Bitola (North Macedonia)

ERAZ Conference 2023 Conference Proceedings: ISBN 978-86-80194-72-1, ISSN 2683-5568, DOI:

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 License ( which permits non-commercial use, reproduction and distribution of the work without further permission. 

Suggested citation

Pinguli, L., & Malollari, I. (2023). Some Alternative Strategies Applied to Brewery Spent Grains for the Development of Sustainable Recycling Solutions in the Agro-Food Industry. In V. Bevanda (Ed.), ERAZ Conference – Knowlegde Based Sustainable Development: Vol 9. Conference Proceedings (pp. 493-500). Association of Economists and Managers of the Balkans.


Aboltins, A., & Palabinskis, J. (2015). Research in brewer’s spent grain drying process. Engi­neering for Rural Development, Jelgava, 20-22 May 2015.

Amoriello, T., & Ciccoritti, R. (2021). Sustainability: Recovery and Reuse of Brewing-Derived By-Products. Sustainability, 13, 2355.

Arranz, J. I., Miranda, M. T., Sepúlveda, F. J., Montero, I., & Rojas, C. V. (2018). Analysis of Drying of Brewers’ Spent Grain. Proceedings, 2(23), 1467.  

Ikram, S., Huang, L. Y., Zhang, H., Wang, J., & Yin, M. (2017). Composition and Nutrient Val­ue Proposition of Brewers Spent Grain. Concise Reviews & Hypotheses in Food Science, Journal of Food Science, 82(10). 

Mallen, E., & Najdanovic-Visak, V. (2018). Brewers’ spent grains: Drying kinetics and bio­diesel production. Bioresource Technology Reports, 1, 16-23. 

Mitri, S., Salameh, S.-J., Khelfa, A., Leonard, E., Maroun, R. G., Louka, N., & Koubaa, M. (2022). Valorization of Brewers’ Spent Grains: Pretreatments and Fermentation, a Review. Fermentation, 8, 50. 

Mussatto, S. I. (2014). Brewer’s spent grain: A valuable feedstock for industrial applications. Journal of Science and Food Agriculture, 94(7), 1264-1275.  

Rachwał, K., Waśko, A., Gustaw, K., & Polak-Berecka, M. (2020). Utilization of brewery wastes in the food industry. PeerJ, 8, e9427.