Installation for water treatment by flotation and corresponding water treatment method

摘要

A system and process for treating water wherein water to be treated is directed to an inlet zone and from the inlet zone to a mixing zone. A flotation zone receives water from the mixing zone. A clarified water collection area is disposed adjacent the flotation zone for receiving clarified water from the flotation zone. There is provided one or more spray nozzles disposed in the mixing zone for injecting pressurized water into the mixing zone and generating air bubbles in the mixing zone such that the air bubbles are mixed with the water to be treated. A perforated plate separates the inlet zone and the mixing zone and includes an array of openings through which water to be treated passes as the water to be treated moves from the inlet zone to the mixing zone. The openings in the perforated plate give rise to a homogeneous mixture of the water to be treated and the air bubbles that result from the pressurized water being injected into the mixing zone by the one or more spray nozzles. Suspended matter and particulate in the water agglomerates around or with the air bubbles and the air bubbles carry the suspended matter and particulate to the surface of the water to be treated. Once the water and air bubbles reach the flotation zone, the air bubbles with the associated suspended matter and particulate can be removed from the surface of the water by a flotation process.

主权项

1. A method removing suspended particles in water through a flotation process, the method comprising:
directing the water to be treated having the suspended particles into an inlet area; directing the water to be treated from the inlet area into a mixing zone; pressurizing the water and directing the pressurized water to a series of spray nozzles disposed in the mixing zone and ejecting the pressurized water from the series of spray nozzles into the mixing zone causing air bubbles to be formed and mixed with the water to be treated in the mixing zone; directing the pressurized water to the series of nozzles includes directing the pressurized water to a network that includes a first distribution network for directing the pressurized water to one or more spray nozzles at a first flow rate and a second distribution network for directing pressurized water to one or more spray nozzles at a second flow rate; directing the water in the mixing zone along with the suspended particles to a flotation zone where the air bubbles are effective to cause the suspended particles to float in an upper level of the flotation zone where the suspended particles can be removed; collecting clarified water in a clarified water collection area; providing a generally homogeneous mixture of the water and the pressurized water in the mixing zone by directing the water to be treated from the inlet area through a perforated plate having an array of openings therein which separates the inlet area from the mixing zone such that water to be treated moving from the inlet area to the mixing zone passes through the array of openings in the perforated plate, resulting in a generally homogeneous mix of the water to be treated with the pressurized water in the mixing zone; and wherein there is provided a clarified water take-up zone about the lower portion of the flotation zone, and the method includes generally preventing the occurrence of a recirculation phenomenon in the clarified water take-up zone.