Degremont

Societe Degremont

Suez International

André Haubry

Roger Pujol

Claude Prevot

Eric Thieblin

Patrick Descamps

Marcel Lesoille

The invention relates to a static decanter (D) for prethickening liquid sludge in a water treatment plant, in particular wastewater, comprising an inclined bottom (), the decanter being provided with a liquid sludge supply pump (), a device for injecting a polymer in the liquid sludge, an overspill discharge () and a pump () 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 (M) for adjusting the level of the sludge blanket (V) and capable of maintaining said level at the lowest possible level.

Quick static decanter for prethickening water treatment sludge, and plant including such a decanter

Method for purifying waste water, whereby the waste water is subjected to a biological treatment producing sludge, part of this sludge being recycled towards the biological treatment while being subjected to ozonation combined with mechanical stirring. A mechanical stirring energy is brought in to attack the walls of the microorganisms.

Method and device for purifying waste water comprising an additional sludge treatment by ozonation

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Mezy sur Seine, France

André Haubry