Anaerobic digestion of brewery spent grain as a mono-substrate in a two-stage anaerobic digestion using solid digestion reactor and granulated biomass reactor

Mario Panjicko (Author), Gregor Drago Zupančič (Author), Romana Marinšek-Logar (Author), Marina Tišma (Author), Bruno Zelić (Author)

Abstract

Anaerobic digestion of brewery spent grain as a mono-substrate was studied. Anaerobic digestion was phase separated in solid state anaerobic digestion reactor, where mostly microbiological hydrolysis and acidogenesis and granular biomass reactor where mostly methanogenesis was performed. The overall process exhibited total solids degradation efficiency between 73.6 and 80.4%. Average specific biogas production was 424±36 L/kg, whereas biomethane production was 230±34 L/kg of brewery spent grain total solids. Granular biomass after adaptation exhibited stabile operation at C-N ratios as low as 0.2 – 0.3, which is rare in anaerobic digestion. P-cresol as a degradation product was present in concentrations up to 45 mg/L and during the process successfully degraded. The excellent adaptability of the granular biomass is confirmed by 67% shift in bacterial and a 32% shift in archaeal community structure in granular biomass reactor after 198 days of successful operation.

Keywords

anaerobic digestion;biogas production;brewery spent grain;microbial biomass;p-cresol degradation;

Data

Language:	English
Year of publishing:	2016
Typology:	1.06 - Published Scientific Conference Contribution (invited lecture)
Organization:	UNG - University of Nova Gorica
UDC:	662
COBISS:	4547579
Views:	4736
Downloads:	0
Average score:	0 (0 votes)
Metadata:

Other data

URN:	URN:SI:UNG
Type (COBISS):	Not categorized
Pages:	str. 1-13
ID:	9203074