Method for treating water containing ammonium-nitrogen

Liquid purification or separation – Processes – Treatment by living organism

Reexamination Certificate

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C210S615000, C210S631000

Reexamination Certificate

active

07438816

ABSTRACT:
Raw water containing ammonium-nitrogen is introduced into a nitrification tank and nitrification of nitrite-nitrogen by nitrite oxidizing bacteria is inhibited according to inhibition of the ammonium-nitrogen, thereby conducting stable nitrification of nitrous acid type at a high load by the action of ammonium oxidizing bacteria. Carbonate and/or bicarbonate are added into the nitrification tank1. The inorganic carbon concentration in the nitrification tank1is maintained at 35 mg-C/L or more. The nitrified liquid thus obtained is introduced into a denitrification tank and denitrification reaction is conducted by the action of denitrifying bacteria with the remaining ammonium-nitrogen as an electron donor and the nitrite-nitrogen as an electron acceptor.

REFERENCES:
Byong-Hee Jun et al; “Stimulating Accumulation of Nitrifying Bacteria in Porous Carrier by Addition of Inorganic Carbon in a Continuous-Flow Fluidized Bed Wastewater Treatment Reactor” Journal of Bioscience and Bioengineering, vol. 89, No. 4, p. 334-339, 2000.

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