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Current trends and future perspectives in dairy by-product valorisation

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  • Aslihan Tüğen

    (Department of Food Engineering, Institute of Sciences, Afyon Kocatepe University, Afyonkarahisar, Türkiye)

Abstract

The increase in milk production and demand for dairy products worldwide has led to the emergence of a wide variety of products in the sector, whilst a high volume of solid (sludge) and liquid waste is also generated. Dairy industry wastes, due to their high organic load (biological oxygen demand, chemical oxygen demand), high moisture content and variable composition, can cause significant environmental and economic problems when disposed of directly. The aim of this research is to determine current methods and possible future trends for the valorisation of dairy industry by-products (whey, casein and lactose-containing wastes, wastewater and sewage sludge). Literature from 2010-2025 was systematically screened in databases such as Web of Science, ResearchGate, ScienceDirect, PubMed and Google Scholar in line with the PRISMA guide, and a total of 34 documents were examined. According to the results, various technologies aimed at conversion into valuable products (valorisation) and integration into the circular economy have come to the fore. Thermochemical methods such as hydrothermal carbonisation (HTC), hydrothermal liquefaction (HTL), pyrolysis and gasification increase energy and chemical substance recovery from wastes with high moisture content. Biological methods (anaerobic and aerobic digestion, composting, microbial fermentation) yield value-added products such as biogas, compost, bioplastic and single cell protein (SCP). The necessity of integrated systems combining both thermochemical and biological approaches is also established in the literature.

Suggested Citation

  • Aslihan Tüğen, 2026. "Current trends and future perspectives in dairy by-product valorisation," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 44(3), pages 167-180.
    • Handle: RePEc:caa:jnlcjf:v:44:y:2026:i:3:id:7-2026-cjfs
    DOI: 10.17221/7/2026-CJFS
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    References listed on IDEAS

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    1. Thanapal, Siva Sankar & Annamalai, Kalyan & Sweeten, John M. & Gordillo, Gerardo, 2012. "Fixed bed gasification of dairy biomass with enriched air mixture," Applied Energy, Elsevier, vol. 97(C), pages 525-531.
    2. David Moher & Alessandro Liberati & Jennifer Tetzlaff & Douglas G Altman & The PRISMA Group, 2009. "Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement," PLOS Medicine, Public Library of Science, vol. 6(7), pages 1-6, July.
    3. Junying Chen & Lijun Wang & Bo Zhang & Rui Li & Abolghasem Shahbazi, 2018. "Hydrothermal Liquefaction Enhanced by Various Chemicals as a Means of Sustainable Dairy Manure Treatment," Sustainability, MDPI, vol. 10(1), pages 1-14, January.
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