| 摘要 |
<p>PURPOSE:To prevent the entanglement of fibrous impurities in water to be treated by arbitrarily setting the distance between filter membranes in a flow passage of water to be treated by a box frame. CONSTITUTION:When aerating air is supplied to an air diffusion pipe 25, the raw water supplied into an aerational tank 22 is digested by activated sludge and water to be treated containing activated sludge rises by air bubbles blown out from the air diffusion pipe 25 to generate a rising stream of water to be treated in a flow passage of water to be treated by the air lift action of said air bubbles. When a water collecting pipe 26 is sucked by a suction pump 27, the water collecting pipe 25 and the treated water flow passage communicating therewith become negative pressure and the water to be treated in the flow passage of the water to be treated is sucked through filter membranes to be filtered. The activated sludge in the water to be treated is blocked by the filter membranes to rise while carried by the rising stream of the water to be treated and carried out of the flow passage of the water to be treated from the upper part thereof. The distance between the filter membranes is arbitrarily set by a box frame 35 and the entanglement of fibrous impurities in the raw water with the filter membranes is prevented.</p> |
