Waste water treatment in biofilm reactor, e.g. trickling filter, involves using simultaneous nitrification and denitrification, where amount of oxygen for nitrification or anoxic condition for denitrification is adjusted

摘要

Waste water treatment involves using simultaneous nitrification and denitrification, where the amount of oxygen for the nitrification or the anoxic condition for the denitrification is adjusted by a controlled air draft. The regularization of the orifice size takes place by opening and closing of lamellae (32), where an opening surface is adjusted between 0-2% of the trickling filter surface. The amount of air for air temperature inside the reactor and air temperature and air humidity outside of the reactor, is calculated by a control system for the simultaneous denitrification. An independent claim is also included for a biofilm reactor, e.g. trickling filter or biological contactor for treating waste water, which comprises an airtight closed roof construction, which has a device for controlling air supply and by which the amount of oxygen necessary for the nitrification or the anoxic condition needed for the denitrification is adjusted.