Patent ID: 7645385
Filing Date: 2010-01-12
Classification: C02F,Y02W,Y10S

Abstract:
1. A method for processing nitrogen-concentrated effluents, by oxidizing ammonium to nitrites followed by a denitration of the nitrites to nitrogen gas in a sequential biological reactor in which reaction phases are fractionated, said reactor containing nitrifying bacteria, operating conditions being provided to privilege the action of nitriting bacteria and to inhibit the action of the nitrating bacteria to the maximum, a method whereby an inflow volume to be processed in a complete cycle is poured into the reactor in successive volume fractions, the complete processing cycle being divided into successive sub-cycles, each sub-cycle comprising a phase of feeding with a volume fraction, followed by an aeration phase to cause the nitrification, followed by an anoxia phase during which the aeration is stopped and a carbon-containing source is introduced into the reactor for converting the nitrites to nitrogen, wherein a series of real-time measurements are taken in the effluent to be processed, in the release and in the biological reactor, the nitrogenous volume feed to be processed in the inflow is evaluated, and the minimum number of feed phases of a complete cycle is determined according to said nitrogenous feed and the minimum volume of liquid in the reactor, according to the following formula: where, Nalim F [NH V N [NH in such a way that the nitrogen concentration of volume fraction injected is diluted in liquid volume remaining in the reactor, thereby avoiding the inhibition of the nitriting bacteria, the nitrogenous feed of the volume fraction being however sufficient for producing in the reactor a “single shot” or peak (P) of the ammoniacal feed upon the pouring of each fraction, that is favorable to the development of the nitrite-producing biomass.