Patent EP-2457874-B1 (EP)
Inventor: STEINSDORFER ROBIN
IPC: B03D1/14
Filed: 2011-11-04
Granted: 2013-09-18
Abstract: System for cleaning wastewater, comprises (a) a flotation reactor, (b) a means for introducing the wastewater (102) in the reactor, (c) a means for separating the clear water (106), (d) a means for generating a gas-clear water mixture (114), (e) at least a means for pressurizing the mixture, (f) a pressure saturation container, (g) a means for reducing the pressure so that a supersaturated solution (128) is formed, (h) a means for introducing the solution in the reactor, (i) at least one means for generating mechanical vibrations, and (j) at least one means for introducing the vibrations. System for cleaning wastewater, comprises (a) a flotation reactor, (b) a means for introducing the wastewater (102) in the flotation reactor, where the flotation reactor is designed so that the wastewater is purified in the flotation reactor by means of pressure expansion flotation, and clear water (106) is obtained, (c) a means for separating the clear water into a first part and a second part, (d) a means for generating a gas-clear water mixture (114) by injecting a gaseous material in the second part of the clear water, (e) at least a means for pressurizing the gas-clear water mixture with a pressure, (f) a pressure saturation container, which passes through the gas-clear water mixture, which is pressurized with the pressure, where the pressure saturation container is designed so that it produces a solution (124) comprising at least a part of the gaseous substance and the second part of the clear water, and the solution is pressurized with the pressure, (g) a means for reducing the pressure, with which the solution is pressurized so that a supersaturated solution (128) is formed, (h) a means for introducing the supersaturated solution in the flotation reactor, (i) at least one means for generating mechanical vibrations, and (j) at least one means for introducing the mechanical vibrations with the pressure, in which the gas-clear water mixture flowing through the pressure-saturation container is pressurized with the pressure. An independent claim is also included for cleaning wastewater comprising (i) passing wastewater into the flotation reactor, (ii) cleaning the wastewater in the flotation reactor by means of pressure expansion flotation so that clear water is formed, (iii) separating the clear water into the first part and the second part, (iv) generating gas-clear water mixture by injecting the gaseous substance in the second part of the clear water, (v) subjecting the gas-clear water mixture with the pressure, (vi) passing the gas-clear water mixture pressurized with the pressure by the pressure saturation container so that it produces the solution comprising at least one part of the gaseous substance and the second part of the clear water, where the solution is pressurized with the pressure, (vii) reducing the pressure, with which the solution is pressurized so that the supersaturated solution is formed, (viii) introducing the supersaturated solution in the flotation reactor, and (ix) introducing the mechanical vibrations into the gas-clear water mixture in the pressure saturation container.