| 摘要 |
<p>PCT No. PCT/FR97/01877 Sec. 371 Date May 26, 1999 Sec. 102(e) Date May 26, 1999 PCT Filed Oct. 20, 1997 PCT Pub. No. WO98/23542 PCT Pub. Date Jun. 4, 1998This method measures the soluble phosphorus concentration in the treated water for at least two different places of the treatment line: at the intake of the secondary clarification step to obtain a measurement P1 and at the outlet of the treatment line to obtain a measurement P2, the measurement P1 determining the amounts of the product precipitating the phosphorus in the liquor of at least one of the tanks in which the anoxic or aerobic steps are carried out upstream of the secondary clarification. The measurement P2 is continuously compared to the measurement P1 so as to detect a possible salting out of the phosphorus at the level of the secondary clarification. When the difference between these two measurements ( DELTA P1-P2) is noted, one of the two following measures occurs: supplementary injection of the precipitating product, before the secondary clarification, or modification of the flow rate of recirculation of the sludge of the clarification step towards the first anaerobic step.</p> |
