RT journal article
T1 Influence of Leachate and Nitrifying Bacteria on Photosynthetic Biogas Upgrading in a Two-Stage System
A1 Saldarriaga, Luis Fernando
A1 Almengló Cordero, Fernando
A1 Cantero Moreno, Domingo
A1 Ramírez Muñoz, Martín
A2 Ingeniería Química y Tecnología de Alimentos
K1 photobioreactor
K1 biogas upgrading
K1 carbon dioxide
K1 ammonia removal
K1 biomethane
K1 gas-liquid ratio
K1 leachate
K1 microalgae
AB Photosynthetic biogas upgrading using two-stage systems allows the absorption of carbon dioxide (CO2) in an absorption unit and its subsequent assimilation by microalgae. The production of microalgae requires large amounts of nutrients, thus making scale-up difficult and reducing economic feasibility. The photosynthetic process produces oxygen (O-2) (1 mol per mol of CO2 consumed), which can be desorbed into purified biogas. Two-stage systems reduce its impact but do not eliminate it. In this study, we test the use of landfill leachate as a nutrient source and propose a viable and economical strategy for reducing the O-2 concentration. First, the liquid/gas (L/G) ratio and flow mode of the absorber were optimized for 20% and 40% CO2 with COMBO medium, then landfill leachate was used as a nutrient source. Finally, the system was inoculated with nitrifying bacteria. Leachate was found to be suitable as a nutrient source and to result in a significant improvement in CO2 absorption, with outlet concentrations of 0.01% and 0.6% for 20% and 40% CO2, respectively, being obtained. The use of nitrifying bacteria allowed a reduction in dissolved oxygen (DO) concentration, although it also resulted in a lower pH, thus making CO2 uptake slightly more difficult.
PB MDPI
SN 2227-9717
YR 2021
FD 2021-09
LK http://hdl.handle.net/10498/27022
UL http://hdl.handle.net/10498/27022
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 08-nov-2026