RT info:eu-repo/semantics/article
T1 H2 addition through a submerged membrane for in-situ biogas upgrading in the anaerobic digestion of sewage sludge
A1 Alfaro, Natalia
A1 Fdz-Polanco, María
A1 Fdz-Polanco, Fernando
A1 Díaz, Israel
AB In-situ upgrading of biogas in a mesophilic anaerobic digester of sewage sludge by sparging H2 through a membrane was studied. Large gas recirculation rates were required to facilitate H2 transfer to the bulk liquid phase; at ∼200 L Lreactor−1 d−1, H2 utilization efficiency averaged 94% and the specific CH4 production increased from 0.38 L Lreactor−1 d−1, during conventional digestion, to 0.54 L Lreactor−1 d−1. Sludge digestion was not compromised by elevated H2 partial pressure nor by the associated rise in the pH (8.1) because of CO2 removal. In this regard, VFA accumulation was not detected and the performance of VS removal was similar to the observed without H2 supply. Microbial analysis revealed that homoacetogens were outcompeted by hydrogenotrophic methanogens. Methanoculleus sp., Methanospirillum sp., Methanolinea sp. and Methanobacterium sp. were the hydrogenotrophic archaea present over the experiment.
SN 0960-8524
YR 2019
FD 2019
LK https://uvadoc.uva.es/handle/10324/65853
UL https://uvadoc.uva.es/handle/10324/65853
LA eng
NO Bioresource Technology, 280, pp. 1-8
DS UVaDOC
RD 11-jul-2024