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Title	Subcritical water pretreatment enhanced methane-rich biogas production from the anaerobic digestion of brewer's spent grains
ID_Doc	8416
Authors	Sganzerla, WG; Ampese, LC; Mussatto, SI; Forster-Carneiro, T
Title	Subcritical water pretreatment enhanced methane-rich biogas production from the anaerobic digestion of brewer's spent grains
Year	2022
Published
Abstract	This study evaluated the effectiveness of a semi-continuous flow-through subcritical water hydrolysis (SWH) pretreatment of brewer's spent grains (BSG) for subsequent application in the anaerobic digestion (AD) process. BSG pretreatment was conducted at 160 degrees C and 15 MPa with a flow rate of 10 mL water min(-1) and 15 g water g(-1) BSG. The results revealed that SWH attacked the hemicellulose structure, releasing arabinose (46.54 mg g(-1)) and xylose (39.90 mg g(-1)) sugars, and proteins (34.89 mg g(-1)). The start-up of anaerobic reactors using pretreated BSG (747.71 L CH4 kg(-1) TVS) increased the methane yield compared with the reactor without pretreatment (53.21 L CH4 kg(-1) TVS). For the process with pretreatment, the generation of electricity (134 kWh t(-1) BSG) and heat (604 MJ t(-1)) are responsible for the mitigation of 43.90 kg CO2 eq t(-1) BSG. The adoption of SWH as an eco-friendly pretreatment of biomass for AD could be a technological route to increase methane-rich biogas and bioenergy production, supporting the circular economy transition by reducing the carbon footprint of the beer industry.
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