Method and arrangement for processing nitrogen-concentrated effluents in a sequential fractionated cycle biological reactor

摘要

The treatment procedure uses the oxidation of ammonia into nitrites followed by denitritation into gaseous nitrogen in a sequential biological reactor with nitrifying bacteria in conditions that promote the action of nitriting bacteria and inhibit the action of nitrating bacteria. The procedure is carried out in cycles divided into sub-cycles of feed and aeration phases. The minimal number of feed phases in a cycle is determined by a formula based on the daily nitrogen charge divided by the concentration of ammonia in the effluent leaving the reactor, the minimal liquid volume the number of complete sequential biological reactor cycles in a day, and the concentration of inhibiting ammonia.