Nitrogen in wastewater


High nitrogen content effluents:

Apart from the classical process via nitrates, Ahidra, agua y energía, S.L. has two innovative processes at industrial facilities for the removal of nitrogen:

  • MBR-NO2® Process: aerobic biological process for nitrogen removal via nitrite, with UF membranes for separation of biomass. This process involves a 40% reduction of the organic matter necessary to carry out denitrification, a 25% saving of the required oxygen and a 30-40% reduction in the volume of reactors.
  • Process MBR – NAS ®, an aerobic biological process with UF membranes, which allows nitrogen removal (denitrification) without carbon source. This process saves 40 % of the required oxygen and a 30-40% reduction in reactor´s volume.


Ahidra, agua y energía, S.L. is able to choose the appropriate process based on the carbon/nitrogen affluent relation and design and build reactors that can operate with high efficiencies of ammonia concentrations greater than 3.000,0 ppm.

Applications of these technologies:

  • Treatment of leachate from MSW / ISW.
  • Effluents from biomethanisation plants using the organic fraction of municipal waste.
  • Liquid fraction of the anaerobic digestion of urban sewage sludge.
  • Liquid fraction of the anaerobic co-digestion of organic waste.
  • Effluent from scrubbers condensate and purges at thermal sludge drying plants.

The technical solution proposed in the above applications is: N-DN aerobic biological process, MBR type , removal of dissolved salts in the UF membranes permeate, by an open channel reverse osmosis and evaporation by thermocompression of the OI retentate.

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