Patent ID: 9011677
Filing Date: 2015-04-21
Classification: B01D,B01F,C02F

Abstract:
1. A static settler for prethickening liquid sludge in a water treatment plant for optimizing operation of one or more thickeners installed downstream of the settler, the settler comprising: a reactor having a sloped bottom converging toward a central recovery pit for extracting prethickened sludge from the reactor, a liquid sludge inlet, a device for injecting polymer into the liquid sludge, and an overflow discharge, wherein: means for accelerating settling of the sludge in the reactor, means (M) for controlling the suspended solids concentration of the prethickened sludge at an outlet of the reactor, the means for controlling the suspended solids concentration being configured to maintain the concentration of the prethickened sludge extracted from the settler substantially constant independent of concentration variations from the liquid sludge inlet, and means (M