RT info:eu-repo/semantics/article
T1 Long-term influence of high alkalinity on the performance of photosynthetic biogas upgrading
A1 Rodero Raya, María del Rosario
A1 Severi, Cristian Alfredo
A1 Rocher-Rivas, Ricardo
A1 Quijano Govantes, Guillermo
A1 Muñoz Torre, Raúl
AB The alkalinity of the cultivation medium plays a key role on photosynthetic biogas upgrading, exerting impact not only on the mass-transfer of CO2 and H2S in the biogas scrubbing column but also on the subsequent CO2 uptake or stripping to the atmosphere. The long-term performance of algal-bacterial processes devoted to the concomitant removal of CO2 and H2S from biogas in a 180 L open pond interconnected to a 2.5 L biogas scrubbing column via an external liquid recirculation of supernatant from a 8 L conical settler under process operation at high inorganic carbon (IC) concentrations was assessed. The influence of biomass concentration in the cultivation medium on process performance was also evaluated. CO2 concentrations in the upgraded biogas fluctuated between 1.5 and 4.4% at IC concentrations in the cultivation medium of 1200 mg C/L, and remained almost constant (0.7 ± 0.1%) at IC concentrations > 2400 mg C/L. However, the increase in the IC concentration from 1203 to 3476 mg C/L entailed an increase in C-CO2 stripping from 14.5 to 33.4% of the IC input to the system. The increase in biomass concentration from 0.33 to 1.38 g SSV/L entailed a reduction in CO2 removal of 1.1% even under process operation at high alkalinity. H2S removal efficiencies of 100% were achieved regardless the IC or biomass concentration.
PB Elsevier
SN 0016-2361
YR 2020
FD 2020
LK https://uvadoc.uva.es/handle/10324/83072
UL https://uvadoc.uva.es/handle/10324/83072
LA spa
NO Fuel, December 2020, Volume 281, 118804
NO Producción Científica
DS UVaDOC
RD 23-mar-2026