| 摘要 |
<p>PURPOSE:To prevent the blocking of a nozzle for blowing concd. effluent water by blowing high pressure concd. effluent water filtered under high pressure into an aeration tank through the nozzle so as to stir a liq. mixture as well as to form circulating flows of the mixture. CONSTITUTION:A liq. mixture (d) of raw water (a) with concd. effluent water (b) in an aeration tank 1 is sucked by a feed pump 6, sent to a filtering apparatus 2 and filtered under high pressure to obtain treated water (e). High pressure concd. effluent water (b) is introduced into the tank 1. When the water (b) is introduced, the liq. mixture (d) flows downward along a draft tube 3, flows upward along the side wall 1b of the tank 1 and flows into the tube 3 from the top, forming circulating flows. Since the liq. mixture is stirred, a stirrer is made unnecessary and the cost of equipment can be reduced.</p> |
