title: Nitrogen removal from wastewater with a low COD/N ratio at a low oxygen concentration.
abstract: The goal of the study was to determine the effectiveness of nitrification and denitrification and the kinetics of ammonia removal from a mixture of wastewater and anaerobic sludge digester supernatant in an SBR at limited oxygen concentration. In addition, the COD removal efficiency and sludge production were assessed. In the SBR cycle alternating aerobic and anaerobic phases occurred; in the aeration phase the dissolved oxygen (DO) concentration was below 0.7 mg O(2)/L. The low DO concentration did not inhibit ammonia oxidation-nitrification and the efficiency was ca. 96-98%. However, a relatively high COD concentration in the effluent was detected. The values of K(m) and V(max), calculated from the Michaelis-Menten equation, were 43 mg N-NH(4)/L and 15.64 mg N-NH(4)/L h, respectively. Activated sludge production was almost stable (0.62-0.66 g MLVSS/g COD). A high net biomass production resulted from a low specific biomass decay rate of 0.0015 d(-1).
authors.affiliation: University of Warmia and Mazury in Olsztyn, Department of Environmental Biotechnology, Słoneczna Str. 45G, 10-709 Olsztyn, Poland. katarzyna.bernat@uwm.edu.pl
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Bernat
authors.forename: Dorota
authors.initials: D
authors.lastname: Kulikowska
authors.forename: Magdalena
authors.initials: M
authors.lastname: Zielińska
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Cydzik-Kwiatkowska
authors.forename: Irena
authors.initials: I
authors.lastname: Wojnowska-Baryła
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D057919:Biological Oxygen Demand Analysis; D007700:Kinetics; D058465:Nitrification; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; D014874:Water Pollutants, Chemical; D000641:Ammonia