Assessment of the propensity of biofilm growth on newfloat carrier media through process and biological experiments

摘要

This paper presents the results of research on biomass growth on Newfloat carrier elementsnand the implications of this growth on the wastewater treatment process. Supervision of thenexperiment comprised of the analysis of treatment efficiency (dynamic experiments), thenestimation of the content of nitrifying bacteria in the biofilm (batch tests) and biologicalninvestigations of the biofilm structure and composition. It has been demonstrated that the biofilmngrowing on the carrier elements was rich in nitrifying bacteria and that this in turn guaranteednthe highly efficient oxidation of ammoniacal nitrogen. After the full growth of biofilm had beennestablished, average removal efficiencies were as follows: organic C removal–88.8% (effluentnCOD below 60mgO2 l21), nitrification–97.9% (effluent ammoniacal N below 1mg N-NHþn4 l21),ndenitrification (after the COD loading rate increased to over 0.53 kgCODm23 d21)–95.7%n(total N in the effluent below 8mgNl21).