title: A novel configuration for an anaerobic submerged membrane bioreactor (AnSMBR). Long-term treatment of municipal wastewater under psychrophilic conditions.
abstract: A novel design for a pilot scale anaerobic submerged membrane bioreactor (AnSMBR) equipped with an ultrafiltration unit, treating municipal wastewater at 18 ± 2°C, and inoculated with a mesophilic inoculum without acclimation, was implemented and evaluated over 3 years of stable operation. The AnSMBR operated with a volumetric loading rate between 1.6 to 2.0 kg COD/m(3)UASBd, 12.8 to 14.2h hydraulic retention time, and reached a tCOD removal efficiency of around 90%. Biosolid production was between 0.05 and 0.083 g VS/g CODremoved. Dissolved methane oversaturation in the effluent was observed, reaching average values of 19.1 ± 0.84 mg CH4/L. The permeate flow rate ranged from 10 to 14L/m(2)h with trans-membrane pressure (TMP) values of 400-550 mbar, using cycles of 30s backwash, 7.5 min filtration, and continuous biogas sparging (9-16 m/h). During the three years of continuous operation, the membrane was not physically or chemically cleaned.
authors.affiliation: Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, Dr. Mergelina s/n, 47011, University of Valladolid, Valladolid, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Gouveia
authors.affiliation: CADAGUA, Gran Via 45, Bilbao, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Plaza
authors.affiliation: CADAGUA, Gran Via 45, Bilbao, Spain.
authors.forename: G
authors.initials: G
authors.lastname: Garralon
authors.affiliation: Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, Dr. Mergelina s/n, 47011, University of Valladolid, Valladolid, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Fdz-Polanco
authors.affiliation: Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, Dr. Mergelina s/n, 47011, University of Valladolid, Valladolid, Spain. Electronic address: pena@iq.uva.es.
authors.forename: M
authors.initials: M
authors.lastname: Peña
mesh_terms: D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D004867:Equipment Design; D008567:Membranes, Artificial; D008697:Methane / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism; D010758:Phosphorus / Q000302:isolation & purification / Q000378:metabolism; D010865:Pilot Projects; D014462:Ultrafiltration / Q000295:instrumentation; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D056804:Biofuels; D008567:Membranes, Artificial; D008697:Methane; D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater
keywords: Methane oversaturation; Municipal wastewater; Psychrophilic temperature; Submerged anaerobic membrane bioreactor