TREATMENT OF PHOSPHORUS-CONTAINING WASTE LIQUID

摘要

PURPOSE:To enable the continuous removal of a phosphoric acid by exchanging a phosphateion adsortion device used when the pH value of the treated water after the treatment decreases to the value below the specified value according to the removal of the phosphoric acid from the treated water by a phosphateion adsorbent. CONSTITUTION:A phosphorus-contg. waste liquid is subjected to an aeration treatment and the activated sludge is separated from the treated water after the aeration treatment. The treated water after the sludge sepn. is treated by activated carbon. An ultrafilter is used to separate the activated sludge in this stage and the treated water is adjusted to the lower pH value before the treatment of the treated water with the activated carbon. The phosphoric acid is further removed by the phosphateion adsorbent from the treated water subjected to the treatment by the activated carbon. The used phosphateion adsorption device is exchanged when the pH value after the treatment by the phosphateion adsorbent decreases to the value below the specified value according to the removal of the phosphoric acid from the treated water. More specifically, the economic efficiency and workability are improved as a whole and the size of the installation is reduced.