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AssigneesSuez Environment, Degremont
InventorsSamuel Martin, Adriana Gonzalez Ospina
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The invention relates to a method for processing nitrogen-concentrated effluents by ammonia oxidation into nitrites followed by nitrite denitritation in a gaseous nitrogen in a sequential biological reactor (1) consisting in pouring a processable effluent volume in to the reactor by successive volume fractions, in dividing the entire processing cycle into successive sub cycles, wherein each sub-cycle comprises a feeding phase, an aeration phase for nitrification and an anoxia phase along which a carbon-containing source is introduced into the reactor for converting nitrites into nitrogen. The inventive method also consists in evaluating a nitrogenous volume charge in the effluent to be processed, mainly by measuring the effluent conductivity (X) and the flow rate (Q) and in determining the number of feeding phases of the entire cycle according to nitrogenous charge and to a minimum volume of liquid in the reactor in such a way that an injected nitrogen concentration is diluted in the liquid volume, wherein the volume phase nitrogenous charge is however sufficient for producing a single shot or peak of the ammonia charge favourable for a nitrating biomass formation in the reactor.
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,
An installation for processing nitrogen-concentrated effluents, in particular containing more than 100 mg N/l, by oxidizing ammonium to nitrites followed by a denitration of the nitrites to nitrogen gas in a sequential biological reactor (1) in which the reaction phases are fractionated, said reactor containing nitrifying bacteria, the operating conditions being provided to privilege the action of nitriting bacteria and to inhibit the action of nitrating bacteria to the maximum, a volume of inflow to be processed in a complete cycle being 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 nitration, 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,
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