WATER TREATMENT SYSTEM WITH BALLAST FLOCCULATION AND SEDIMENTATION, WITH SIMPLIFIED SEDIMENT RECIRCULATION AND AN APPROPRIATE METHOD

摘要

1. A sludge recirculation system to be added to the sedimentation zone of water treatment equipment using at least one purification method selected from the group consisting of flocculation, sedimentation, coagulation and ballast flocculation, the sludge recirculation system being designed for multiple cycling said sludge in a method for gradually pumping out water, comprising: a tank for extracting sludge located downstream of the method, comprising a cavity for extracting sludge, located the bottom of said vessel, wherein the cavity defines a specific volume of said sedimentation zone, where it can be accumulated sediment by gravity; recirculation device comprising: i. means for separating liquid and solid products that make it possible to clean the liquid solution by removing the solid contaminants contained therein; ii. recirculation means containing: 1. a recirculation line connected at its inlet edge to a specified cavity for sludge extraction and connected to said means for separating liquid and solid products at its outlet edge; 2. a re-introduction line connected in working condition at its inlet edge with said means for separating liquid and solid products and with said tank for extracting sludge at its outlet edge; and 3. a withdrawal line connected at its inlet edge to the reintroduction line and releasing a high density precipitate from said water treatment equipment at its outlet edge located further down the process; iii. active