PURPOSE: To maintain high speed treatment performance and to achieve miniaturization by a method wherein a fluidized bed carrier is constituted from a magnetically reactive material which is magnetically attracted by exciting action and magnetically released by demagnetizing action.
CONSTITUTION: The interior of a reaction tank R is partitioned by means of an intermediate partition wall 1 to form a reaction tank 2 using anaerobic bacteria on the front inflow side and a reaction tank 3 using aerobic bacteria on the rear outflow side. A proper amount of carriers X having magnetic reactivity are put into both of the reaction tanks 2, 3. The carriers X are made of synthetic resin, as base material, such as polypropylene, and iron powder is mixed into the base material, which is formed into granules so that the granules are magnetically attracted by exciting action and magnetically released by demagnetizing action. Water treated in the tank 3 is sent together with the carriers X from an outflow pipe 12 to a settling tank 13. In the tank 13, an electromagnet 15 is energized to magnetically attract the carriers X to which bacteria have been attached, thereby precipitating them to the bottom of the tank 13, following which electricity is cut off to demagnetize the electromagnet 15 to release the carriers X to lift them through an air lift tube 16.
SATO YOSHIHIKO
SUZUKI EIICHI
GOTO MASASHI
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