To always keep nitrification speed high by suppressing a sudden drop of nitrification speed at a rise time in a nitrification tank in which an AL bacterium (a nitrification bacterium) exist or during a stationary operation.
In an aerobic atmosphere in the nitrification tank 14, ammonia nitrogen-containing liquid is brought into contact with AL bacterium immobilizing carriers 16 on which the AL bacterium is dominantly bred, so that the ammonia nitrogen-containing liquid is nitrified, the AL bacterium being detected after the culture of 8 weeks in an ammonium sulfate solution of low concentration of 100 mg/L, and at the same time, the ratio of nitrile nitrogen concentration/ammonia nitrogen concentration in the nitrification tank 14 is controlled in the range of 2-10.
COPYRIGHT: (C)2005,JPO&NCIPI
Takako Ogasawara
Nabe Abe
Oshikiri Kenmune
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