Quick static decanter for prethickening water treatment...

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 21/20 (2006.01) C02F 1/00 (2006.01) C02F 1/42 (2006.01) C02F 1/52 (2006.01) C02F 11/12 (2006.01) B01D 21/32 (2006.01)

Patent

CA 2750849

The invention relates to a static decanter (D) for prethickening liquid sludge in a water treatment plant, in particular wastewater, comprising an inclined bottom (8), the decanter being provided with a liquid sludge supply pump (13), a device for injecting a polymer in the liquid sludge, an overspill discharge (23) and a pump (26) for extracting the prethickened sludge from the decanter. The decanter further includes a means for accelerating the sludge decantation, a means (M) for adjusting the concentration of suspended material in the prethickened sludge at the outlet, and capable of maintaining the concentration of the prethickened sludge extracted from the decanter at a substantially constant level despite the concentration variations at the inlet, and a means (M3) for adjusting the level of the sludge blanket (V) and capable of maintaining said level at the lowest possible level.

Décanteur statique (D), pour pré-épaissir les boues liquides dans une installation de traitement d'eau, en particulier d'eaux usées, comportant un fond incliné (8), ce décanteur étant équipé d'une pompe d'alimentation (13) en boues liquides, d'un dispositif d'injection de polymère dans les boues liquides, d'un rejet de surverse (23) et d'une pompe d'extraction (26) des boues pré-épaissies du décanteur; il comporte des moyens pour accélérer la décantation des boues, des moyens de régulation (M) de la concentration en matières en suspension en sortie, des boues pré-épaissies, propres à maintenir sensiblement constante la concentration des boues pré-épaissies extraites du décanteur, malgré les variations de concentrations en entrée, et des moyens de régulation (M3) du niveau du voile de boue (V) propres à maintenir ce niveau le plus bas possible.

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