Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a flotation water treatment plant comprising at least: an inlet zone (31) for the water to be treated, which is coagulated and flocculated beforehand; a mixing zone (32), for mixing pressurized and then depressurized water with said water to be treated; a flotation zone (35) separated from said mixing zone by a wall; a clarified-water take-up zone (36) provided in the lower part of said flotation zone (35). According to the technique shown here, said mixing zone accommodates (32) at least one spray nozzle (40, 91, 92) for spraying said pressurized water, said spray nozzle (40, 91, 92) lying close to a panel (33), at least part of which has perforations (331), said panel separating said inlet zone (31) from said mixing zone (32).

Abstract: A gravitational separation device for purifying water includes a basin for receiving and holding the water. The basin includes an internal wall. At least one supply channel is provided to the periphery of the basin for providing water to the basin. A plurality of openings is provided in a bottom or floor portion of the supply channel. Disposed under the openings is a plurality of deflector plates. A skirt spaced from the internal wall of the basin is inclined towards the interior of the basin at an angle of approximately 5° to 80°. A discharge channel is provided for discharging liquid from the basin, and there is also provided a device for discharging suspended particles.

Abstract: A gravitational separation device for purifying water includes a basin for receiving and holding the water. The basin includes an internal wall. At least one supply channel is provided to the periphery of the basin for providing water to the basin. A plurality of openings is provided in a bottom or floor portion of the supply channel. Disposed under the openings is a plurality of deflector plates. A skirt spaced from the internal wall of the basin is inclined towards the interior of the basin at an angle of approximately 5° to 80°. A discharge channel is provided for discharging liquid from the basin, and there is also provided a device for discharging suspended particles.

Abstract: A water treating system is provided with a membrane chamber having one or more membranes disposed therein for filtering water. To periodically clean the membranes, there is provided a series of cleaning fluid inlets that permit a cleaning fluid, such as a gas, to be injected through the inlets into the membrane chamber which results in the cleaning fluid cleaning the membranes therein. The cleaning fluid inlets are normally closed and are adapted to open in response to the pressure of the cleaning fluid reaching a certain pressure level.

Abstract: An untreated flow of waste water is normally introduced into a plain sedimentation unit during plain sedimentation periods to separate it into sand and a flow treated by plain sedimentation. During other periods, for example periods of heavy rain, a coagulating agent, ballast sand and a flocculating agent are introduced. The coagulated flow is passed into a maturation intermediate area and then, with substantially all the sand and colloids of particles attached to it, into the plain sedimentation unit. Here effluent is separated by plain sedimentation and evacuated and sludge made up of the sand and the adhering colloids and particles is extracted and evacuated via an extraction system and the sand outlet channel of the plain sedimentation unit. The sludge is collected, the ballast sand is separated from it to be recycled into the sand injection area and the sludge and excess sand are extracted.