A compact and sustainable technology for sludge digestion, Ephyra is based on plug flow digestion, where the hydraulic retention time (HRT) and solids retention time (SRT) are separated. Reactor design, process control and operations have been optimised to improve performance and increase capacity. Ephyra is suitable for optimising both existing and new sludge digestion installations.
Now proven at full-scale for new and upgrade projects, Ephyra was originally developed by Royal HaskoningDHV in cooperation with STOWA (Foundation for Applied Water Research), Waterboard Zuiderzeeland. (The project was co-financed with a contribution from the LIFE financial instrument of the European Union and with the Top Sector Energy subsidy from the Ministry of Economic Affairs.)
In comparison to a conventional sludge digestion installation, Ephyra provides: