A method of controlling a feed rate of at least one chemical into a body of water includes: (a) dispensing one or more chemicals into a body of water with a chemical pumping device; (b) determining a chemical feed pump usage of at least one chemical into the body of water during a designated period of time; and (c) (i) automatically increasing chemical gain of the at least one chemical into the body of water if the pump usage is greater than a first pump usage set-point, or (ii) automatically decreasing chemical gain of the at least one chemical into the body of water if the pump usage is less than a second pump usage set-point. A system for using the method is also included.

An advanced oxidation water treatment system includes an ozone reaction tank; a first hydrogen peroxide supplier which supplies hydrogen peroxide to treatment water in a supply line supplying the treatment water to the ozone reaction tank; an ozone generator which generates and supplies an ozonized gas containing ozone to the ozone reaction tank; a second hydrogen peroxide supplier which can supply additional hydrogen peroxide to the ozone reaction tank downstream of where the ozonized gas is supplied; a meter which measures water quality of the treatment water at a location downstream of where the ozonized gas is supplied; and a controller which determines whether and how much additional hydrogen peroxide is to be supplied by the second hydrogen peroxide supplier based on the water quality measured by the meter, and to control the second hydrogen peroxide supplier accordingly.

A water purification system that generates ozone and passes the ozone through stored purified water to reduce the growth and/or presence of bacteria, organisms, and/or other undesirable components in purified water.

A water treatment system includes: a water treatment device; a feed-water pump that feeds water to be treated to the water treatment device; an ozone generator that generates ozone-containing gas containing ozone gas and oxygen gas; and a direct-current power supply that supplies direct-current power. The water treatment device includes: an ejector including an inlet-side wider-diameter part into which the water is introduced, a nozzle in communication with the inlet-side wider-diameter part and including a sidewall including an inlet opening into which the ozone-containing gas is introduced, and an outlet-side wider-diameter part in communication with the nozzle, from which the water mixed with the ozone-containing gas is ejected; and an electrolyzer located downstream of the ejector and including an electrolysis-purpose electrode supplied with the direct-current power to electrolyze the ejected water mixed with the ozone-containing gas.

A method and an installation for treating a main wastewater stream flowing in a closed conduit with a flow direction. The method includes the steps of: introducing a liquid into at least one pre-treatment stream; generating a gas stream containing ozone gas; introducing the gas stream into the at least one pre-treatment stream, each with a gas injector, resulting in at least one mixed-phase stream comprising ozone laden gas and liquid; passing the at least one mixed-phase stream through at least one static mixer, resulting in a predefined gas bubble size; and injecting the at least one mixed-phase stream in the main wastewater stream perpendicular to the flow direction.

The efficiency of water disinfection can be significantly increased by supplying the ozone in combination with oxygen to an inlet of a cavitation pump or a line atomizer. A compressor can be introduced at an inlet of the cavitation pump or the line atomizer, compressing the gas mixture at a pressure higher than the pressure within pump or the atomizer. The compressed gases are provided to the inlet of the atomizer or the pump, where the compressed gases mix with the water and enter the cavitation pump or the line atomizer (where most of the dissolution of the gases happens). The compressor allows to increase the amount of oxygen and ozone provided to the pump or the line atomizer, increasing their dissolved concentration. In addition to the disinfecting properties, the higher level of oxygen correlates to an improved taste of the water.

A gas dissolution supply apparatus dissolves a gas supplied from a gas supply unit in a liquid supplied from a liquid supply unit to produce a gas dissolution in a gas dissolving unit, stores the gas dissolution produced in the gas dissolving unit in a gas dissolution tank, supplies the gas dissolution from the gas dissolution tank to a point of use, measures the flow rate of a part of the gas dissolution supplied to the point of use that is returned to the gas dissolving unit, and adjusts the flow rate of the liquid supplied from the liquid supply unit to the gas dissolving unit based on the result of the measurement.

Disclosed are methods for continuous production of ozone strong water, the methods comprising the steps of injecting an acidification agent into a pressurized feed water to maintain a pH value of the pressurized feed water below 7, diffusing a two-phase mixture of O.sub.2-O.sub.3 gas and recirculated water into a body of acidic pressurized water to dissolve ozone into the acidic pressurized water. The disclosed methods include simultaneously maintaining a start-up mode in an upper portion of the dissolution column that favors high efficiency of ozone mass transfer into the acidic pressurized water and a steady state mode in a lower portion of the dissolution column that favors a high concentration of dissolved ozone in the acidic pressurized water coexistent in the body of the acidic pressurized water, wherein an ozone concentration gradient is formed along a height of the body of the acidic pressurized water.

Disclosed are systems for continuous production of ozone strong water, the systems comprising an injection device that injects an acidification agent into a pressurized feed liquid, a diffuser device that injects ozone into a body of the acidic pressurized feed water, and injection nozzles each controlled by a valve that adjust a flow rate of the ozone strong water discharged from a dissolution column to match a flow rate of the acidic pressurized feed water fed to the dissolution column, thereby maintaining a start-up mode in an upper portion of the dissolution column that favors a high efficiency of ozone mass transfer and a steady-state mode in a lower portion of the dissolution column that favors a high dissolved ozone concentration coexistent in the body of the acidic pressurized liquid, wherein a concentration gradient of dissolved ozone is formed along a height of the body of the acidic pressurized liquid.

A water treatment system includes a container for holding water and a water treatment device secured at an upper portion of the container. The water treating device is configured to filter and disinfect water using ozone. The water treatment device includes a filter element and an ozone distributor wrapped about the filter element in a tortuous configuration.