| 摘要 |
PURPOSE:To remove phosphorus, BOD, SS and ammonia at high speed and in high degree with a single vessel by adding particulates of dense iron hydroxide and/or aluminum hydroxide to a phosphorus-containing org. sewage, then introducing the sewage to a packed layer fixed with microorganisms under an aerobic condition. CONSTITUTION:A slurry 6 of dense iron hydroxide particulates having large phosphorus adsorptivity is added to the phosphorus-containing org. sewage 1 such as sewerage, and the sewage is stirred in a pipeline 10 and flowed into the packed layer 3 in an aerobic biological filter device 2 from an upper side of this device. In this case, aluminum hydroxide is exemplified as the particulates having the phosphorus adsorptivity other than the iron hydroxide. Moreover, both of the iron hydroxide and aluminum hydroxide may be used. Then, the phosphorus is adsorbed and removed quickly by the dense particulates of the iron hydroxide, etc., and SS in the sewage is captured by a biological membrane of the filter device 2 to be filtered and removed. BOD and ammonia are also removed biologically with microorganisms sticking to the filter material, and a clarified treated water 7 flowing out from a lower part of the filter device 2 is obtained. |
