RT journal article
T1 Anoxic desulfurization of biogas rich in hydrogen sulfide through feedback control using biotrickling filters: Operational limits and multi-omics analysis
A1 Brito García, Javier
A1 Frade González, José Carlos
A1 Almengló Cordero, Fernando
A1 González Cortés, José Joaquín
A1 Valle Gallardo, Antonio
A1 Durán Ruiz, María del Carmen
A1 Ramírez Muñoz, Martín
A2 BiomedicinaBiotecnología y Salud Pública
A2 Física de la Materia Condensada
A2 Ingeniería Química y Tecnología de Alimentos
K1 Sulfur-oxidizing bacteria
K1 Nitrate-reducing bacteria
K1 Metagenomics
K1 Proteomics
K1 Microbial community dynamics
AB Biodesulfurization is crucial for sustainable biogas purification from hydrogen sulfide (H2S). This study investigates the operational limits of anoxic biotrickling filters (BTFs) for treating biogas with high H2S concentrations (up to 20,000 ppmv) using nitrite, along with simulated interruptions in H2S supply. The BTF achieved a maximum elimination capacity of 312 g S-H2S m−3 h−1 with an H2S removal efficiency of 98 % at an empty bed residence time of 284 s. A proportional-integral-derivative (PID) feedback control system was successfully employed to maintain an H2S outlet concentration close to the requisite setpoint (100 and 500 ppmv) by adjusting the nitrite flow rate, thereby minimizing its accumulation. Continuous nitrite feeding after interruptions in H2S supply was essential to avoid H2S release due to sulfate-reducing bacteria. Multi-omics analyses, combining metagenomics and proteomics, revealed Sulfurimonas as the dominant sulfur-oxidizing bacteria, which downregulates most enzyme genes involved in nitrogen and sulfur metabolism in response to substrate starvation. These findings underscore the resilience of BTFs under extreme conditions and the value of multi-omics approaches in understanding microbial population dynamics, positioning BTFs as a robust solution for large-scale biogas purification.
PB Elsevier
SN 0960-8524
YR 2025
FD 2025
LK http://hdl.handle.net/10498/37295
UL http://hdl.handle.net/10498/37295
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026