Biological water treatment process and plant using activated...

Details Biological water treatment process and plant using activated... Biological water treatment process and plant using activated...

C - Chemistry, Metallurgy

02

F

C02F 3/00 (2006.01) C02F 3/30 (2006.01)

Patent

CA 2531764

The invention relates to a method and installation for the biological treatment of water using activated sludge or mixed cultures, including the aeration of the activated sludge tank. The inventive method consists in: (a) fixing the times for the aeration (T1min and T1max) and non-aeration (T2min and T2max) periods, high (SHNO3) and low (SBNO3) set values for the nitrate concentration of the treated water or the mixed liquor, and a high set value for the redox potential (SH redox) of the water present in the tank; (b) continuously measuring the aeration (T1) and non-aeration (T2) times, the nitrate levels in the treated water or the mixed liquor, and the redox potential of the mixed liquor, and not aerating the mixed liquid either (i) when the nitrate concentration is less than SB NO3 and T2 is less than T2min or (ii) when the nitrate concentration is greater than SB NO3 but T2 has not reached time T2max; and (c) aerating the mixed liquor either (i) when the measured nitrate concentration is greater than SH NO3, (ii) when the measured redox potential value is greater than SH redox and T1 is less than T1min, (iii) when the nitrate concentration is less than SH NO3, or (iv) when the oxidation-reduction potential value is less than SH redox but T1 has not reached T1max.

L'invention concerne un procédé et une installation pour le traitement biologique d'eau par boues activées ou cultures mixtes incluant une régulation de l'aération du bassin de boues activées consistant à fixer des temporisations des périodes d'aération (T1 min et Tlmax) et de non-aération (T2min et T2max), des valeurs de consignes haute (SHNO3) et basse (SBNO3) de la teneur en nitrates de l'eau traitée ou de la liqueur mixte et une valeur de consigne haute du potentiel rédox (SH rédox) de l'eau présente dans le bassin, à mesurer continûment les temps d'aération (T1) et de non aération (T2), le taux de nitrates dans l'eau traitée ou la liqueur mixte et le potentiel rédox de la liqueur mixte et à ne pas aérer la liqueur mixte soit tant que la teneur en nitrates reste inférieure SB N03 et que T2 est inférieur à T2min, soit lorsque la teneur en nitrates reste supérieure SB N03 mais que T2 n'atteint pas le temps T2max; à aérer la liqueur mixte soit tant que la teneur en nitrates mesurée reste supérieure à SH N03 ou bien lorsque la valeur de potentiel rédox mesurée reste supérieure à SH rédox, et que T 1 est inférieur à T l min, soit lorsque la teneur en nitrates reste inférieure à SH N03 ou lorsque la valeur de potentiel d'oxydoréduction reste inférieure à SUI rédox, mais que T 1 n'atteint pas T l max.

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