NITRATE FORMING NITRIFICATION/DENITRIFICATION METHOD, METHOD FOR NITRIFYING/DENITRIFYING AMMONIA NITROGEN-CONTAINING LIQUID AND NITRATE FORMING NITRIFICATION/DENITRIFICATION EQUIPMENT

摘要

PPROBLEM TO BE SOLVED: To provide a nitrification/denitrification method in which a nitrite forming nitrification reaction is carried out at all times even when a flow rate is fluctuated. PSOLUTION: An ammonia nitrogen-containing liquid P1 higher than the predetermined temperature is fed to a reaction tank 2 in which the diffusion and non-diffusion of air are repeated in a predetermined cycle. The diffusion time of air is changed according to the fluctuation of the flow rate of the ammonia nitrogen-containing liquid P1 so that the hydraulic residence time of the ammonia nitrogen-containing liquid to be diffused by air is not fluctuated substantially. PCOPYRIGHT: (C)2007,JPO&INPIT