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Upcycling and Valorisation of Food Waste
Published in Christian Reynolds, Tammara Soma, Charlotte Spring, Jordon Lazell, Routledge Handbook of Food Waste, 2020
Mohamed A. Gedi, Vincenzo di Bari, Roger Ibbett, Randa Darwish, Ogueri Nwaiwu, Zainudin Umar, Deepa Agarwal, Richard Worrall, David Gray, Tim Foster
Spent grain is a major by-product from the brewing industry, which consists of the wet solid material remaining after the mashing process, after the majority of starch and soluble sugars have been extracted from the malt prior to fermentation of the wort liquor. Several hundreds of thousands of tonnes of BSG are produced by breweries in the UK annually, which are sold primarily as a low-value ruminant feed (Aliyu and Bala, 2011). The nutritional content for feed applications is acceptable, where typically BSG contains around 25% protein and around 60% polysaccharides on a dry mass basis (Mussatto et al., 2006). However, as-made wet BSG consists of only 25–30% solids after pressing, which not only lowers deliverable nutritional value but also leads to microbial instability resulting in a low storage life of maybe 2–3 days.
Beyond animal feed?
Published in Antje Klitkou, Arne Martin Fevolden, Marco Capasso, From Waste to Value, 2019
Simon Bolwig, Michael Spjelkavik Mark, Maaike Karlijn Happel, Andreas Brekke
The large quantities of spent grain, along with an increasing interest in organic waste valorisation and circular bioeconomy, have spurred interest in developing new valorisation pathways as an alternative to the traditional use of spent grain as animal feed. Spent grain has a high protein content and other nutritional assets, and research projects have shown that it can be used as a feedstock in various industries, including livestock feed, food and nutrition, chemicals, pharmaceuticals and biofuels (Buffington, 2014; Mussatto, 2014; Thomas & Rahman, 2006). Yet, despite this technical potential, scholars have identified few examples of advanced uses of spent grain on an industrial scale (Aliyu & Bala, 2011; Mussatto, 2014), suggesting low levels of the deployment of research results.
Solid Waste, Hazardous Materials, and Hazardous Waste Management
Published in Herman Koren, Best Practices for Environmental Health, 2017
Spent grains are byproducts of the brewing process which are still high in protein, fiber, and other nutrients. This can be used as animal feed, in bakeries for cookies and dog biscuits, etc. This is an example of other industries using the unwanted byproducts of a different industrial group. It helps protect the environment and reduces the quantity of waste for disposal. Spent grains can also be composted.
Valorization of agro-industrial wastes to produce volatile fatty acids: combined effect of substrate/inoculum ratio and initial alkalinity
Published in Environmental Technology, 2021
Ruth Iglesias-Iglesias, María Mercedes del Coro Fernandez-Feal, Christian Kennes, María C. Veiga
The brewery spent grain (BSG) was selected due to the increasing importance of the production of beer worldwide. The brewery industry generates large amounts of by-products and wastes; spent grain, spent hops and yeast are the most common ones, being the spent grain the most abundant corresponding to around 85 % of total wastes generated [29]. Per hl of beer produced, 14–20 kg of BSG are generated [30]. Consequently, waste disposal has become a cost factor and a significant aspect in the running of a brewery operation.