| 摘要 |
<p>PURPOSE:To eliminate clogging in a screen and thereby obtain a low-cost screen device by providing a cleaning means which pushes out impurities sticking to a screen, its drive means and an air diffusion means which circulates the pushed-out impurities into a bioreaction tank. CONSTITUTION:In a screen device which has an outflow part or a circulation part of a reaction liquid for charging a carrier 35 in a bioreaction tank 20 and performs biotreatment, a brush 27 as a cleaning means for pushing out impurities sticking to the screen 22 from the screen 22, a chain 26 which moves the brush 27, an air motor 30 and an air diffusion device 24 which circulates the impurities 34 pushed out into the bioreaction tank 20 are provided. Consequently, the impurities 34 sticking to the screen 22 is pushed out of the screen 22 by the brush 27, and at the same time, is returned to the reaction tank again. Further, the impurities is allowed to slip out of the mesh of the screen 22, flowing out of the tank 20.</p> |
