Methods and apparatus for supplying high concentrations of dissolved oxygen and ozone for chemical and biological processes

A dissolved gas supply system, comprising:

• a vacuum pressure swing adsorption system having a first tank and a second tank, each tank containing molecular sieve media, the vacuum pressure swing adsorption system also having a control valve to alternate a flow of air into the first and second media tanks, and a flow of nitrogen adsorbed onto the media out of the first and second media tanks, a low pressure blower providing air to the vacuum pressure swing adsorption system;
• an ozone dissolving system to dissolve ozone into water drawn from a water treating process;
• an oxygen pressurization and ozone generation system to deliver concentrated oxygen from the vacuum pressure swing adsorption system and supply an oxygen-ozone gas mixture to the ozone dissolving system at a pressure required by the ozone dissolving system, the ozone generation system having a low-pressure tank to hold the concentrated oxygen exiting the vacuum pressure swing adsorption system, a compressor with a high-pressure tank to pressurize the concentrated oxygen from the low-pressure tank, an oxygen gas cooler to decrease the oxygen gas temperature, and an ozone generator to convert a portion of the concentrated oxygen to ozone for dissolving, in the ozone dissolving system;
• and
• a control system adapted to monitor the concentration of the oxygen exiting the vacuum pressure swing adsorption system, the control system adapted to selectively change the flow of air from the blower into the first tank or the second tank in response to a concentration of oxygen exiting the vacuum pressure swing adsorption system.

A dissolved gas supply system, comprising:

• a vacuum pressure swing adsorption (VPSA) system having a first tank and a second tank, each rank containing molecular sieve media, the VPSA system having a control valve to alternate the flow of air into the first and second media tanks, and the a flow of nitrogen adsorbed onto the media out of the first and second media tanks, a low pressure blower providing air to the VPSA system;
• a low-pressure tank to store the concentrated oxygen gas exiting the VPSA system;
• a dissolved gas generator including a fluid mixer having a venturi for mixing the concentrated oxygen from the low-pressure tank with water to be treated;
• and
• a control system adapted to monitor the concentration of the oxygen exiting the VPSA system, the control system adapted to selective change the flow of air from the blower into the first tank or the second tank in response to a concentration of oxygen exiting the vacuum pressure swing adsorption system, in which the fluid mixer further comprises
• an upper cylindrical donut housing with a first fluid inlet in the upper housing,
• a radial grooved ring having a plurality of grooves,
• the ring being concentric to the upper donut housing,
• the ring having an outer diameter on a first end that is smaller than a diameter of the donut housing thus defining a distribution channel,
• a venturi orifice ring having orifices adapted to inject ozone into water leaving the grooves and
• a lower cylinder concentric with the ring and surrounded by the ring, the cylinder in fluid communication with the distribution channel via the grooves, a liquid outlet being located at a bottom of the cylinder.

A dissolved gas supply system, comprising:

• an oxygen supply system having a pressurized oxygen supply tank:
• a low-pressure tank for storing the oxygen from the supply tank, a valve being between the low-pressure tank and the oxygen supply tank;
• a fluid mixer for mixing oxygen from the low-pressure tank and water circulated through the fluid mixer from a treating system;
• and
• a controller adapted to shut off the valve between the oxygen supply tank and the low-pressure tank when the pressure of the oxygen in the low pressure tank drops below a predetermined value, as measured by an oxygen pressure sensor thereon,
• wherein oxygen not dissolved in the fluid mixer is returned to the low-pressure tank, and wherein the fluid mixer comprises:
• an upper cylindrical donut housing with a first fluid inlet in the upper housing;
• a radial grooved ring having a plurality of grooves,
• the ring being concentric to the upper donut housing,
• the ring having an outer diameter on a first end that is smaller than a diameter of the donut housing thus defining a distribution channel;
• a venturi orifice ring having orifices adapted to inject oxygen into water leaving the grooves;
• and
• a lower cylinder concentric with the ring and surrounded by the ring, the cylinder in fluid communication with the distribution channel via the grooves, a liquid outlet being located at a bottom of the cylinder.

A dissolved gas supply system, comprising:

• an air supply system adapted to pressurize air from the atmosphere;
• a pressure swing adsorption system having a first container and a second container, each container containing molecular sieve media, the pressure swing adsorption system also having a control valve to alternate a flow of air into the first and second containers, and a flow of nitrogen adsorbed onto the media and out of the first and second containers, the air supply system providing pressurized air to the pressure swing adsorption system, concentrated oxygen exiting the pressure swing adsorption system;
• a fluid mixing system adapted to draw water from a treating process, and to dissolve the concentrated oxygen from the pressure swing adsorption system into the water to saturation levels, excess oxygen from the fluid mixing system passing through an outlet;
• and
• a control system adapted to monitor the concentration of the oxygen exiting the pressure swing adsorption system, the control system adapted to selectively alternate the flow of pressurized air from the air supply system into the first container or the second container in response to a concentration of oxygen exiting the first and second containers, in which the fluid mixing system includes a fluid mixer having
• an upper housing having a cylindrical donut with a fluid inlet, the upper housing having a gas separation chamber to separate excess gases such as oxygen from liquids such as water for discharging oxygen through a gas outlet on the upper housing;
• a ring having a plurality of grooves,
• the ring being concentric to the cylindrical donut housing,
• the ring having an outer diameter on a first end that is smaller than a diameter of the cylindrical donut housing, thus defining a distribution channel;
• an orifice ring adapted to inject oxygen in water leaving the grooves;
• and
• a cylinder concentric with the ring and surrounded by the ring, the cylinder in fluid communication with the distribution channel via the grooves, a saturated liquid outlet being located at a bottom of the cylinder.