| 摘要 |
<p>PURPOSE:To realize the continuous operation of the device by making the suction side of a blower for a diffuser selectively and freely be communicative with the air or a space above the surface of water in a reaction tank and aerating air in a nitrification process, while aerating gaseous nitrogen in a denitrification process, thereby continuously washing the surface of a membrane. CONSTITUTION:A membrane separator 12 is arranged in a reaction tank 11 of closed structure and plural immersed type membrane modules 13 consisting of ceramic tubes, etc., in the membrane separator 12 are connected to the suction side of a suction pump 15 through a suction pipe 14. A diffuser 16 is arranged below the membrane separator 12 to diffuse air from a blower 18. In this case, a suction pipe 19 connected to the suction side of the blower 18 is opened to the air through the 1st solenoid stop valve 20 and simultaneously is made to communicate with a space above the surface of water in the reaction tank 11 by a circulating air pipe 21 branching off from the suction pipe 19 through the 2nd solenoid stop valve 22. Air sucked in from the suction pipe 19 in the nitrification process and gas sucked in from the circulating air pipe 21 in the denitrification process are each sent to the diffuser 16 to perform aeration.</p> |
