Energy efficient hybrid processes for tertiary wastewater treatment
The EU Water Framework Directive was introduced with the aim of achieving good ecological and chemical status of surface waters by 2027.
Berlin‘s wastewater treatment were subject to major upgrades in the last decade, but due to the slowly flowing rivers in this region the target of the WFD will only be met by further technical measures related to nutrients retention. In particular, the phosphorus concentrations in the rivers Spree and Havel must be cut down to a level of 60 to 90 micrograms per litre in order to prevent massive algae growth in the long term.
For this reason, the further optimisation of Berlin’s wastewater treatment plants will be essential implying comprehensive measures for the reduction of contaminants from agricultural land and rainwater discharges.
In the scope of the OXERAM project several promising methods such as micro-sieving and membrane filtration aiming at effluent concentrations for phosphorus in the range of 50 to 120 microgram per litre were tested at the wastewater treatment plant Berlin-Ruhleben. The project has been financed by the Berlin Environment Relief Programme (UEP-II) since January 2010 and received additional financial support by Berliner Wasserbetriebe and Veolia.
The life cycle assessment and economic evaluation of the processes were supplemented by the research results Berliner Wasserbetriebe have gained in the course of their long-term examinations on volume filtration.