Waste products
- Spent grain
The main waste products released from brewery is brewers’ spent grain (BSG). According to the Journal of Cereal Science from Science Direct (2006), approximately eighty-five percent of total waste products are brewers’ spent grain.The composition of brewers’ spent grain is lignocellulosic matters. There are several compositions of lignocellulosic, which are seventeen percent cellulose, twenty-eight percent non-cellulosic polysaccharides (mostly arabinoxylans), and twenty-eight percent lignin (S.I. Mussatto, 2006)[2]
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In fact, the brewery industry generates various waste products, but these products can be exported to other industries and used for other purposes. For example, the rootlets that came out from the barley malting process can be collected and used to feed animals. Additionally, another product is the hops that came from spruce wort can be recycled again as a fertilizer for agriculture. Moreover, Vitamin B is high in the yeast that is already used in brewing processes, which then can be merchandised to other pharmaceutical industries to make supplements related to vitamin or food additive (American Brewer Column, 2007).