| 摘要 |
PURPOSE:To efficiently remove a phosphate ion, by packing a particulate material having a particle size smaller than that of an aluminum-containing particulate substance in the downstream side of said aluminum-containing particulate substance. CONSTITUTION:A treatment tank 1 is successively packed with a large particle size particulate material packed bed 2 of plastic or anthracite, an aluminum- containing substance packed bed 3 of activated alumina and a small particle size particulate material packed bed 5 of sand from above. A reaction solution prepared by injecting a chemical solution in raw water and reacting both of them is supplied to the treatment tank 1 by a pump 13 and passed through packed layers 2-5 in downward flow to collect a flocculated substance. Treated water, from which the flocculated substance was collected, is introduced into a treated water tank 15 from a treated water pipe 14.
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