Werkwijze voor het behandelen van ammonia-houdend afvalwater

Treatment of ammonia-comprising waste water comprises: (a) subjecting the waste water to a nitrification treatment using a nitrifying microorganism and adding oxygen, to give a solution comprising an oxidation product of ammonia, and (b) converting the oxidation product of ammonia into nitrogen using a denitrifying microorganism, use of bicarbonate-containing waste water, which is substantially stripped of bicarbonate by the supply of air, and maintaining the pH in the 1st step at \~7.2 by controlling the aeration, part of the ammonia present is converted into nitrite, and in the 2nd step the denitrifying microorganism uses the formed nitrite as oxidant for the remaining ammonia.Applied Science