Method and apparatus for preparation and use of ozone water

A mixing device for establishing a liquid-gas mixture, comprising:

• a liquid inlet (1),
• a gas inlet (2) and a liquid-gas mixture outlet (3), and
• a conduit (9) for joining said liquid inlet (1) and said liquid-gas mixture outlet (3), characterized by a porous member (5), at least at the upstream end of the porous member (5) being in scaling contact with the inner walls of said conduit (9), said porous member (5) having a first surface being in contact with the liquid and second surface being in contact with the gas, the dimensions of said conduit (9) being such that a pressure difference is created in the liquid before and after said member (5) such that the gas is made to diffuse through said porous member (5),
• characterized in said porous member (5) exhibiting a through-bore (7) essentially co-axial with said conduit (9), the bore (7) constituting a constriction of the conduit (9), the inside walls of said through-bore (7) constituting said first surface, said inner wall having an essentially circumferential recess formed in the inner walls of the conduit essentially along the porous member (5) said recess connected with the gas inlet (2) giving the gas access to the outside of the porous member, said outside constituting said second surface.

A method for production of active water, water having dissolved ozone therein, characterized by the following steps:

• feeding filtered and de-mineralized water to a container to a predetermined level;
• re-circulating the water from the bottom of said container through a conduit comprising pumping means and mixing means;
• dissolving ozone gas in said re-circulated water in said mixing means under controlled inlet flows;
• feeding said water having dissolved ozone to said container, measuring the instant ozone concentration of said water having dissolved ozone;
• said water having dissolved ozone re-circulated through the mixing means under addition of further ozone in dependence of said measurement of the ozone concentration;
• said last step repeated when the measured ozone concentration is below a predetermined value.

A subsystem for production of water having ozone dissolved therein, said system comprising:

• water feeding means (11, V1, 71, 30, 83) having means (V1) for controlling the flow of water to the system and a filtering and de-mineralizing unit (30),
• a container means (60),
• ozone feeding means (10, 70, V2, F1, 20) having means (V2) for controlling the flow of the oxygen gas and/or air to the system, an ozone generator, and means (V3) for distributing the flow of ozone gas to the mixing means (BK), or to an outlet for ozone gas (14), a pressure sensor (PR) and a flow sensor (F1), for feeding ozone to a mixing means (BK) having a chamber having a water inlet (1) for water from the lower part of said container (60), an ozone inlet (2) for ozone from said ozone feeding means, said ozone inlet (2) having a diffusor means comprising a porous member, a water outlet (3) for water having dissolved ozone through an outlet conduit leading to the upper pan of the container (60), whereat there are control means for monitoring the addition of ozone independence of the measured ozone concentration, for dissolving ozone in said water;
• said mixing means (BK) drawing water from the lower part of the container (60) by way of a conduit (77) that is adapted to return the water having ozone dissolved therein from said mixing means (BK), to a point in the container (60) below the liquid level in said container (60),
• ozone measuring means (51) that is arranged in the outlet conduit (71) from the lower part of the container (60), hat pumping means (P2) are provided to withdraw said water from the bottom of the container (60) past the concentration measuring means (51) and in dependence of a control signal from the control unit (50) either return the water to a point below said predetermined liquid level in the container (60) or to deliver said water through The outlet (84, P2, 84, V4, 12) for water having the predetermined concentration of ozone, for measuring the ozone concentration of said water in the container (60),
• water pumping means (P1, P2) for circulating said water from he lower par of the container (60) to the upper part of the container (60) in dependence of a measured ozone concentration in said water and said ozone feeding means feeding ozone to said mixing means (BK) in dependence of a predetermined ozone concentration value, said container (60) having an outlet (84, P2, 84, V4, 12) for water having the predetermined concentration of ozone, said system adapted to maintain a predetermined liquid level in said container, said system also comprising a control unit (50) for controlling the system in dependence of measured physical parameters in the system, in conjunction with a mixing means to be used preferably with active water having ozone dissolved therein, said water system characterized by a treatment chamber (912;
• 1012) or detachable connections for connecting an apparatus or device to be treated with the ozone-water mixture, at least one ozone sensor (910, 911;
• 1011), means for registering and control at least of the ozone content of the ozone-water mixture after said mixture has flown through said treatment chamber (912;
• 1012) or said apparatus or device to be treated.