Method of controlling the phosphorus concentration in...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/12 (2006.01) C02F 3/00 (2006.01)

Patent

CA 2231796

The invention relates to a method of controlling a biological wastewater purification plant, in which the wastewater is aerated in an activation tank in the presence of an activated sludge and, to influence the properties of the activated sludge, phosphorus is added under controlled concentration, which comprises measuring the phosphorus concentration in the activated sludge for the control of the phosphorus addition and controlling the phosphorus addition in such a manner that the phosphorus concentration in the activated sludge is greater than or equal to a lower limit and is less than or equal to an upper limit. By means of the method according to the invention, the effluent values of a biological wastewater purification plant can be optimized and the limit values in the effluent of a wastewater purification plant prescribed by the authorities can be complied with better than hitherto.

L'invention porte sur une méthode pour contrôler une station de purification biologique d'eaux usées, dans laquelle les eaux usées sont aérées dans un réservoir d'activation, en présence de boues activées; pour modifier les propriétés des boues activées, on ajoute du phosphore en ajustant la concentration; cela consiste à mesurer la concentration de phosphore dans les boues activées et à ajuster l'addition de phosphore de telle façon que la concentration de ce dernier dans les boues activées soit supérieure ou égale à une limite inférieure, et inférieure ou égale à une limite supérieure. Grâce à la méthode de la présente invention, les valeurs de l'effluent d'une station de purification biologique d'eaux usées peuvent être optimisées, et il devient ainsi plus facile qu'auparavant de se conformer aux valeurs limites prescrites par les autorités pour l'effluent d'une station de purification d'eaux usées.

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