Membran-Bioreaktor-Technik kombiniert mit nachgeschalteter Ozonung – Vergleich mit konventionellen Ozonanwendungen Combination of Membrane Bioreactor and Downstream Ozonation – A Comparison to Conventional Ozone Applications

With the revision of the EU urban wastewater directive, higher requirements regarding the quality of the effluent of wastewater treatment plants (WWTPs) were defined. To meet these standards, existing WWTPs must be modernized with additional treatment processes. Within the research project „HyFive”¹⁾ an innovative process combining a membrane bioreactor (MBR) and downstream ozonation is developed to eliminate organic micropollutants (OMPs) while increasing plant capacity. The objective is to assess the feasibility of the process based on its treatment performance and the ecotoxicological impacts when treating MBR filtrate with ozone. So far derived results indicate that when applying smaller ozone concentrations, 80 % of selected OMPs can be eliminated. Furthermore, ecotoxicological investigations demonstrated that the effluent of the downstream ozonation step poses no risk to receiving water bodies.