C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/17
C02F 3/12 (2006.01) C02F 3/30 (2006.01) C02F 11/08 (2006.01)
Patent
CA 1046661
ABSTRACT OF THE DISCLOSURE In a process of nitrogen removal from wastewater com- prising mixing wastewater containing reduced nitrogenous compounds with active nitrifying organisms and an oxygen containing gas and contacting said nitrified wastewater stream with heterotrophic de- nitrifying bacteria in the presence of a source of organic carbon for a length of time sufficient to reduce the nitrate nitrogen to elemental nitrogen the improvement which comprises heating the biomass removed from the nitrifying and denitrifying steps in the presence of an oxygen-containing gas to partially oxidize the bio- mass and convert substantially all of the organic nitrogen to ammonia nitrogen, separating the solid phase from the liquid phase of the oxidized mixture, stripping ammonia from the liquid phase and directing said liquid phase to the denitrifying contact step to provide a source of organic carbon.
234635
Gitchel Wayne B.
Knopp Paul V.
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