title: Nitrogen recovery from pig slurry in a two-chambered bioelectrochemical system.
abstract: Abiotic batch experiments showed that ammonia migration from anode to cathode was favored by an increase in voltage, from 39.9% to 44.6%, using synthetic media. A slight increase in ammonia migration was observed when using pig slurry, reaching a maximum of 49.9%. In a continuously MFC fed with pig slurry with a stripping/absorption unit coupled to the cathode chamber, the highest nitrogen flux (7.2 g N d(-1) m(-2)) was achieved using buffer as catholyte. Nitrogen flux increased to 10.3 g N d(-1) m(-2) when shifting to MEC mode. A clear improvement in nitrogen flux (25.5 g N d(-1) m(-2)) was observed when using NaCl as catholyte. Besides, ammonia stripping was favored, reaching a nitrogen recovery of 94.3% in the absorption column, due to the high pH reached in the cathode. The microbial community analysis revealed an enrichment of certain taxonomic Eubacterial and Archaeal groups when the system shifted from MFC to MEC mode.
authors.affiliation: IRTA, GIRO Joint Research Unit IRTA-UPC, Torre Marimon, ctra. C-59, km 12,1, E-08140 Caldes de Montbui, Barcelona, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Sotres
authors.affiliation: IRTA, GIRO Joint Research Unit IRTA-UPC, Torre Marimon, ctra. C-59, km 12,1, E-08140 Caldes de Montbui, Barcelona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Cerrillo
authors.affiliation: IRTA, GIRO Joint Research Unit IRTA-UPC, Torre Marimon, ctra. C-59, km 12,1, E-08140 Caldes de Montbui, Barcelona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Viñas
authors.affiliation: IRTA, GIRO Joint Research Unit IRTA-UPC, Torre Marimon, ctra. C-59, km 12,1, E-08140 Caldes de Montbui, Barcelona, Spain. Electronic address: august.bonmati@irta.cat.
authors.forename: A
authors.initials: A
authors.lastname: Bonmatí
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000737:chemistry; D000818:Animals; D001105:Archaea / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D008372:Manure; D059013:Microbial Consortia; D009584:Nitrogen / Q000737:chemistry*; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000737:chemistry; D017422:Sequence Analysis, DNA; D012965:Sodium Chloride / Q000737:chemistry; D034421:Sus scrofa; D013552:Swine; D013696:Temperature; D013997:Time Factors; D062065:Wastewater
chemical_list: D000641:Ammonia; D008372:Manure; D009584:Nitrogen; D012336:RNA, Ribosomal, 16S; D012965:Sodium Chloride; D062065:Wastewater
keywords: 454-Pyrosequencing; Ammonia migration; Ammonia stripping; Bioelectrochemical system (BES); Pig slurry