Process for biological purification of water by nitrification and denitrification.

摘要

Water purification using biological treatment. According to the process the raw water to be treated without preliminary sedimentation is introduced upwards into a first reactor (1) operating in the absence of oxygen, containing free biomass in the form of a sludge bed of high concentration and fed with a high upward flow rate and the effluent (4) is taken into a second reactor (2) operating in the presence of air, a proportion of the water treated (7), overflowing from this second reactor, being recycled to the base of the first reactor (1). Application to the treatment of water containing ammoniacal nitrogen.