| 摘要 |
<p>PURPOSE:To remove BOD and SS with a simple stage by admitting org. waste water contg. BOD and SS into the biological membranes of an anaerobic or aerobic immersion filter bed then introducing an oxygen-contg. gas in the filter bed of the deep layer. CONSTITUTION:Raw water 1 which is removed of coarse SS through a screen flows in upward flow into an immersion filter bed 2 of filter media of sands, anthracite, etc. of an arbitrary shape stuck with micro organisms. At the same time, oxygen is supplied from an air diffuser 3. Part of the BOD in the raw water 1 are removed by the microorganisms on the surfaces of the filter media and part of SS are captured in the bed 2 as well. The SS remaining in outflow water 4 are filtered away while flowing downward in a stationary bed 5 of granular filter media. On the other hand, the BOD components remaining in the water 4 are removed by the oxygen discharged from the air diffuser 6 and the microorganisms in the bed 5 and purified water 7 is obtained.</p> |
