| 摘要 |
PURPOSE:To reduce the size of an installation by separating activated sludge by an ultrafilter from the treated water after an aeration treatment, adjusting the treated water obtd. by the sepn. to low pH, treating the same by the active carbon and removing phosphorus acid therefrom by an adsorbent. CONSTITUTION:Phosphorus-contg. waste liquid is subjected to the aeration treatment by the activated sludge and the activated sludge is separated from the treated water after the aeration treatment. The treated water after the sepn. of the sludge is treated by the active carbon to adsorb the org. matter as the COD component. The sepn. of the activated sludge in this stage is executed by the ultrafilter and the treated water is adjusted to 3-4 pH value before said water is treated by the active carbon. The phosphorus acid is removed by the phosphate ion adsorbent consisting of zirconium oxide hydrate, etc., from the treated water which is treated by the active carbon. As a result, the size of the installation is reduced and the activated sludge is easily separated even if a flocculating agent is not used. |
