Ozone generators.

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    Ozone was first used by municipalities to improve the organic qualities of water with control of taste, odor and color as well as for its germicidal action. Application of ozone in waste water treatment includes the destruction or removal of: complex organic molecules, cyanides and phenols from chemical waste, etc..

    In addition, subjecting municipal waste waters or combined municipal waste waters or combined municipal industrial waste waters to a final ozone process enables reuse for applications such as wash-water, irrigation, or fire fighting systems. Ozone is also used extensively in industry in oxidation processes and for disinfection purposes. Typical industrial examples are in the P&P industry for pulp bleaching, chemical industry where ozonolysis is necessary for the production of certain substances, and in cooling-tower systems where ozone replaces the less desirable chemical biocides.

    It is an accepted fact that drinking water is disinfected when a residual of 0.4 mg/l of ozone has been maintained for 4 minutes (Typical CT). However, ozone has many additional benefits in the drinking water process:

    • In preozonation, ozone improves clarification and avoids the transformation of organic material to haloforms. It also promotes the destruction of micro-organisms such as algae.
    • Main ozonation treatment specifically breaks down trace contaminants and enhances the biodegradability of organic substances which are then removed in a biological treatment step.
    • Finally, combined treatments involving ozone and activated carbon or ozone and peroxide are currently the most powerful means available to water process engineers for the removal of contaminants and constitute a vital safeguard against accidental contamination.


    Ozone is produced on a commercial-scale by means of silent electrical discharge - the result of a high voltage alternating field acting between two electrodes separated by a dielectric and a narrow gap. The feed gas, usually air or oxygen, flows through the narrow gap across which the discharge occurs. The ozone generator’s electrodes are two concentric tubes, an outer tube made of stainless steel and an inner electrode formed by a layer of metal on the inside of a dielectric.