WERKWIJZE EN INRICHTING VOOR HET VERWIJDEREN VAN STIKSTOF UIT AFVALWATER MET BEHULP VAN DOMPEL-DRUPPELLICHAMEN.

摘要

Apparatus for removing nitrogen from sewage characterised in that a two-stage immersion percolating filter plant (1) comprises a first stage (2) for carbon degradation, followed by an intermediate clarification tank (9) and a second stage (3) for the nitrification stage, which has an additional clarification tank (13), from which clarified sludge may be returned to the first stage (2) where denitrification occurs, the nitrates formed in the second stage now providing the necessary oxygen for carbon degradation.