Ruiz, J.; Fernández, B.; Viñas , M.; Guivernau, M.; Tey, L.; Riau, V.; Flotats, X.; Prenafeta, F. Taller y Seminario Latinoamericano de Digestión Anaerobia p. 66-67 Data de presentació: 2016-10-25 Presentació treball a congrés
Biomass from two full-scale anaerobic digester treating different wastes regarding to nitrogen concentrations and operating under different hydraulic retention time was characterized by methanogenic batch activity assays at different ammonia concentrations. Two several different patterns regarding activity and microbial parameters was demonstrated depending on operational conditions and methanogenic pathway. Furthermore, syntrophic acetate oxidation (SAO) process could be a possible alternatively pathway to obtain more methane enrich biogas.
Ruiz, J.; Fernández, B.; Viñas , M.; Guivernau, M.; Tey, L.; Riau, V.; Flotats, X.; Prenafeta, F. Taller y Seminario Latinoamericano de Digestión Anaerobia p. 69 Data de presentació: 2016-10-25 Presentació treball a congrés
Ammonia is the main inhibitor of methanogenesis during the anaerobic digestion (AD) of protein-rich materials. Promoting biomass development as biofilm is a well-known strategy to overcome inhibition by toxic compounds in engineered AD systems. In the on-going study, the biofilm formation on three supports (zeolite, magnetite and nylon) and the bacterial acclimatisation of syntrophic acetate oxidizing bacteria (SAOB) and hydrogenotrophic methanogenic archaea (HMA) was successfully attained. The results suggest that magnetite and nylon could enhance the proliferation of SAOB above the support, while zeolite due to its capacity to retain ammonia in its structure avoid the presence of those communities.
Hydrophobic membranes (HM) are common in water purification processes to separate volatile compounds. When such membranes are combined with anaerobic digesters (AD), inhibitory phenomena involving methane production, due to ammonium nitrogen, would be overcome.
In this work, three continuous AD were operated under high N level and similar conditions (retention time, feed composition, and inoculum). Two AD were connected to similar HM but different membrane area to digester volume ratio (AM/VD), while the third hasn´t membrane (control AD).
Although the similar inlet total N (3.5gN L-1), the outlet ammonium N and the CH4-yield depended on the AM/VD ratio. Moreover, both parameters were compared with simulated values obtained with the ADM1 model.