| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent fouling, make maintenance easy even in the case fouling occurs, and set the maximum passing flow velocity higher than that of a conventional apparatus. SOLUTION: A cylindrical rotary drum screen 6 is installed near the water surface of a treatment tank 1 and a washing means 9 for washing the exposed part of the rotary drum screen 6 is installed in an upper part of the treatment tank 1. Since the screen face is constantly washed by the washing means 9, fouling of the screen is improbable. The screen 6 may be like a lattice or bars and the meshes of the screen 6 is controlled to be 10-90% of the minimum diameter of a carrier 5.</p> |
