Abstract
Thermophilic Co-Digestion of Sewage Sludge and Brewery Spent Grain
Highlights
The brewing industry generates relatively large amounts of by-products and wastes, such as brewery spent grain (BSG), spent hops and yeast
The analysis of the composition of the influent used in the experiments indicated that the average total solids (TS) and volatile solids (VS) increased as the BSG dose increased (Fig. 2)
The results indicate that the measured additions of BSG/MBSG as a co-substrate for the thermophilic anaerobic digestion of sewage sludge enhanced both the biogas/methane potential and the production rate
Summary
The brewing industry generates relatively large amounts of by-products and wastes, such as brewery spent grain (BSG), spent hops and yeast. With increasing energy costs, the brewing industry, which consumes approximately 4 m3 of natural gas per hectolitre of beer, strives to convert most of its wastes to alternative energy sources. In such perspective, anaerobic digestion has become an alternative for the production of renewable energy through biogas from these waste substrates. Brewery spent grain is a substrate consisting largely of cellulose, hemicellulose and lignin, which are difficult to degrade anaerobically, mostly due to the presence of degradation products, such as phenolic compounds, which cause the process inhibition (Panjičko et al 2017).
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