To provide a cleaning method of diffuser, which can easily remove dry and deposited foreign matter by making a water to be flow backward into an air diffusion pipe.
In this diffuser, a gas for diffusion is jetted into the water to be treated by diffusion in a reaction tank 1 from a plurality of jet ports 3 at the bottom of the air diffusion pipe 2 immersed in the tank 1. After stopping diffusion, the water to be treated is made to flow backward into the air diffusion pipe 2 from a tip opening 4 of the air diffusion pipe 2 bent downward and each jet port 3. The influent water humidifies the foreign matter dry and deposited in the vicinity of each jet port 3. Then, diffusion is restarted, and the water to be treated in the air diffusion pipe 2 is discharged from the tip opening 4, and the humidified foreign matter is removed by the sweeping stream of the water to be treated.
NARUKAMI YOSHIHISA
FUKUHARA SHINICHI
OI HIROSUKE
