Patent ID: 6932905

Claim:
Apparatus for water treatment comprising: an inlet for waste water to be treated; a mixing tube assembly for receiving the waste water from the inlet and through which the waste water passes to an outlet of the mixing tube assembly for mixing into the waste water a plurality of chemicals for causing flocculation of contaminants in the waste water; and a separating chamber connected to the outlet of the mixing tube assembly for receiving the waste water and the chemicals mixed therein for separating the flocculated contaminants and for supplying clarified water at an outlet of the separating chamber, said separating chamber comprising an inclined perforated screen with a water supply system at the top edge of the screen for receiving water and contaminants from the mixing chamber and supplying them across the screen for flowing over the screen, a sludge collecting tank at a bottom edge of the screen and a water collection tank underneath the screen for collecting water passing through the screen; wherein the mixing tube assembly comprises: a duct with an inlet at one end and the outlet at the other end; a plurality of injection members at spaced positions along the duct each including a pump and a chemical supply for injecting a selected quantity of a selected chemical into the duct; and a plurality of mixing members in the duct at spaced positions therealong arranged such that each injection member is associated with a respective mixing member for mixing the chemical into the water in the duct.