| 摘要 |
PURPOSE:To remove phosphate in water in extremely good efficiency, by constituting contact layers each containing a phosphate adsorbent in one or more stages in the up-and-down direction in a vertical treating tower by water passable support plates while supplying water to the lower end in the treating tower to flow the same in an upwardly directed stream. CONSTITUTION:A phosphate adsorbent is continuously or intermittently replenished to the uppermost stage contact layer by a supply pipe 6 and raw water is supplied to the bottom part of a tower from a water supply pipe 7 by a pump to be flowed in an upwardly directed stream while treated water is flooded over a flooding weir 12 from the upper part of the uppermost stage contact layer. In this case, the water passing linear speed of water is set to 5-30m/hr and the adsorbents of the upper stage contact layers are inhibited from mutually falling to the lower stage contact layers through a non-angle-of-repose nozzle 5 by the water upwardly flowed through the non-angle-of-repose nozzle 5. By this method, the phosphate adsorbent of each stage contact layer is fluidized in a boisterous state by the upwardly directed water stream and efficiently contacted with water to remove the phosphate in water by adsorption.
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