title: Full-scale nitrogen removal from digester liquid with partial nitritation and anammox in one SBR.
abstract: Full-scale application of partial nitritation and anammox in a single suspended-growth sequencing batch (SBR) reactor presented here confirm the process suitable for removing nitrogen from ammonium-rich wastewater with low concentrations of BOD and suspended solids: details of simple and robust process control based on online ammonium or conductivity signals are discussed by describing the full-scale startup at three municipal plants (five reactors in total). Ammonium oxidation rates of up to 500 gN m(-3) d(-1) with conversion to N2 of over 90% are achieved in a full-scale plant, but pilot results indicate that significantly higher rates are feasible. With continuous aeration at dissolved oxygen concentrations <1 mgO2 x L(-1), the nitrite oxidation and the anammox reaction occur simultaneously, allowing increased overall performance and simplified process control compared to separate aerobic end anaerobic phases (segregated either temporally or in different reactors). Sedimentation of the sludge requires special attention only during startup. Although the observed N2O emissions were slightly higher than in conventional nitrogen removal, the overall greenhouse gas emissions were lower, mainly due to energy-saving.
authors.affiliation: Eawag, Swiss Federal Institute for Aquatic Science and Technology, Uberlandstrasse 133, PO Box 611, CH-Dübendorf, Switzerland. adriano.joss@eawag.ch
authors.forename: Adriano
authors.initials: A
authors.lastname: Joss
authors.forename: David
authors.initials: D
authors.lastname: Salzgeber
authors.forename: Jack
authors.initials: J
authors.lastname: Eugster
authors.forename: Roger
authors.initials: R
authors.lastname: König
authors.forename: Karin
authors.initials: K
authors.lastname: Rottermann
authors.forename: Sabine
authors.initials: S
authors.lastname: Burger
authors.forename: Peter
authors.initials: P
authors.lastname: Fabijan
authors.forename: Susanne
authors.initials: S
authors.lastname: Leumann
authors.forename: Joachim
authors.initials: J
authors.lastname: Mohn
authors.forename: Hansruedi
authors.initials: H
authors.lastname: Siegrist
mesh_terms: D019149:Bioreactors; D009573:Nitrites / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification / Q000379:methods
chemical_list: D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical; D009584:Nitrogen; D010100:Oxygen