title: Innovative treatment system for digester liquor using anammox process.
abstract: This study demonstrated that partial nitritation using nitrifying activated sludge entrapped in a polyethylene glycol (PEG) gel carrier, as a pretreatment to anammox process, could be successfully applied to digester liquor of biogas plant at a nitrogen loading rate of 3.0 kg-N/m(3)/d. The nitritation process produced an effluent with a NO(2)-N/NH(4)-N ratio between 1.0 and 1.4, which was found to be suitable for the subsequent anammox process. A high SS concentration (2000-3000 mg/l) in the digester liquor did not affect partial nitritation treatment performances. Effluent from this partial nitritation reactor was successfully treated in the anammox reactor using anammox sludge entrapped in the PEG gel carrier with T-N removal rates of greater than 4.0 kg-N/m(3)/d. Influent BOD and SS contents did not inhibit anammox activity of the anammox gel carrier. The combination of partial nitritation and anammox reactors using PEG entrapped nitrifying and anammox bacteria was shown to be effective for the removal of high concentration ammonium in the digester liquor of a biogas plant.
authors.affiliation: Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan. k-furu@gpo.kumamoto-u.ac.jp
authors.forename: Kenji
authors.initials: K
authors.lastname: Furukawa
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Inatomi
authors.forename: Sen
authors.initials: S
authors.lastname: Qiao
authors.forename: Lai
authors.initials: L
authors.lastname: Quan
authors.forename: Taichi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Kazuichi
authors.initials: K
authors.lastname: Isaka
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Sumino
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D005782:Gels; D009584:Nitrogen / Q000032:analysis; D017672:Nitrogen Compounds / Q000032:analysis; D010084:Oxidation-Reduction; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D005782:Gels; D017672:Nitrogen Compounds; D000644:Quaternary Ammonium Compounds; D009584:Nitrogen