| 摘要 |
PURPOSE:To treat sewage at low cost, by treating the sewage using powdery coke as a carrier. CONSTITUTION:A treatment tank 3 is packed with a carrier composed of powdery coke. Subsequently, raw sewage 1 is introduced into the treatment tank 3 by a raw water pump 2 and, at the same time, air is blown in the distribution cylinder 4 arranged in the treatment tank 3 from a blower 5. The carrier 6 in the treatment tank 3 is allowed to rise in the distribution cylinder 4 by air lift action and subsequently allowed to fall in the treatment tank 3 outside the distribution cylinder to be smoothly fluidized and recirculated. After the biological oxidation treatment, the carrier 6 is separated by the carrier separation part 7 provided to the upper part of the treatment tank 3 and treated water 8 is allowed to overflow from the separation part 7. By this method, sewage can be satisfactorily purified at low running cost.
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