| 摘要 |
<p>PURPOSE:To prolong stagnation time necessary for biological reactions efficiently by providing a dispersing member for dispersing and feeding water to be treated guided from a rising channel embedded in the ground sidewardly toward lateral outside direction as compared to an opening of the rising channel, to a water storage tank installed near the ground surface. CONSTITUTION:Circulated water fed with a pump P from a feed water tank 7 supplies O2-contg. gas supplied from a gas feeding pipe 5 by means of an ejector, and is led to an outward lateral direction by a dispersing member 9 from an opening 8 of a rising channel 2 through a downward channel 1 of a double tube 10A, 10B, and then dispersed and fed to a water storage tank 3 installed near the ground surface. Thus, the water to be treated and contained in the flat water storage tank 3 having a large capacity is stirred over the whole part of the tank without generating a dead zone. Thus, a stagnation time necessary for the biological reaction of the water to be treated can by prolonged efficiently by increasing the capacity of the water storage tank, and the rising flow rate of the water to be treated is also increased in accompany with the floating effect of bubbles. Accordingly, consumption of power for the pump is also saved.</p> |
