Biogas Upgrading and Ammonia Recovery from Livestock Manure Digestates in a Combined Electromethanogenic Biocathode—Hydrophobic Membrane System
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Autor/a
Cerrillo, Miriam
Burgos, Laura
Bonmatí, August
Fecha de publicación
2021-01-19ISSN
1996-1073
Resumen
Anaerobic digestion process can be improved in combination with bioelectrochemical systems in order to recover energy and resources from digestates. An electromethanogenic microbial electrolysis cell (MEC) coupled to an ammonia recovery system based on hydrophobic membranes (ARS-HM) has been developed in order to recover ammonia, reduce organic matter content and upgrade biogas from digested pig slurry. A lab-scale dual-chamber MEC was equipped with a cation exchange membrane (CEM) and ARS with a hydrophobic membrane in the catholyte recirculation loop, to promote ammonia migration and absorption in an acidic solution. On the other hand, an electromethanogenic biofilm was developed in the biocathode to promote the transformation of CO2 into methane. The average nitrogen transference through the CEM was of 0.36 gN m−2 h−1 with a removal efficiency of 31%, with the ARS-HM in the catholyte recirculation loop. The removal of ammonia from the cathode compartment helped to maintain a lower pH value for the electromethanogenic biomass (7.69 with the ARS-HM, against 8.88 without ARS-HM) and boosted methane production from 50 L m−3 d−1 to 73 L m−3 d−1. Results have shown that the integration of an electromethanogenic MEC with an ARS-HM allows for the concomitant recovery of energy and ammonia from high strength wastewater digestates.
Tipo de documento
Artículo
Versión del documento
Versión publicada
Lengua
English
Materias (CDU)
619 - Veterinaria
Páginas
12
Publicado por
MDPI
Publicado en
Energies
Citación
Cerrillo, Miriam, Laura Burgos, and August Bonmatí. 2021. "Biogas Upgrading And Ammonia Recovery From Livestock Manure Digestates In A Combined Electromethanogenic Biocathode—Hydrophobic Membrane System". Energies 14 (2): 503. doi:10.3390/en14020503.
Número del acuerdo de la subvención
MINECO/Programa Estatal de I+D+I orientada a los retos de la sociedad/RTA2015-0079-C02-01/ES/Uso de reactores bioelectroquímicos para optimizar la recuperación de energía y nutrientes de aguas residuales de alta carga/
Program
Sostenibilitat en Biosistemes
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