Solutions > Disinfection/Oxidation > Ozone

Disinfection: Ozone

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Background

Ozone (O3) Disinfection

Degremont Technologies - Ozonia designs and manufacturers a wide-range of ozone generators from the smallest to the largest in the world including ozone plants with capacities of several hundred kilos per hour.

As a world leader in ozone disinfection treatment, Ozonia designs and manufactures ozone generators incorporating the most sophisticated electronics technology available. Ozonia systems are designed for various water and wastewater treatment application in the municipal and industrial markets. Each system has a variety of technical features developed to simplify installation and allow minimal operator attention and maintenance.

Degremont Technology - Ozonia offers unique professional expertise and decades of experience in ozone generation technology resulting in numerous developments such as IGBT medium frequency power supply unit and IGS™ dielectric technology.

MEMBREL® electrolytic cells for pure water systems extends the range of Degremont Technology-Ozonia products and services. With thousands installations around the world, Degremont Technologies-Ozonia offers unparalleled international experience.


Applications

Overview

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.

The high oxidation potential of ozone, which is 50% higher than chlorine, has prompted many chemical and pharmaceutical companies to use Degremont Technologies-Ozonia ozone equipment in their manufacturing facilities. In partnership with clients, Degremont Technologies-Ozonia applies its knowledge in the field of ozone generation to achieve the best overall conditions (price, delivery, safety aspects) for all types of pilot or industrial plants. Either in its extensive laboratory resources or on the client’s premises, Degremont Technologies-Ozonia is in a position to demonstrate the advantages of a clean oxidation technology.


Municipal

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.

Municipal/Industrial

The use of ozone in waste water treatment is expanding and already includes the destruction or removal of:

  • Complex organic molecules in order to improve biodegradability
  • Pharmaceutically Active Compounds (PAC’s) and endocrine disruptors
  • Color from dye works’ effluent, paper mills, etc.
  • Surfactants, detergents from washing centers
  • Cyanides and phenols from chemical waste
  • Odor elimination from urban waste water plants or industrial flue gas
  • Odors from condensates/ wash-waters, which can then be recycled

 


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 washing, irrigation, or fire fighting systems.


Industrial

Ozonia ozone has become the most economical process for ECF and TCF pulp bleaching, avoiding the production of chlorinated compounds (AOX). Degremont Technologies has committed major research efforts to this issue and is a leader in the field of large-scale optimised systems operating at high concentrations and pressures. Many pulp mills are producing ozone bleached pulp complying with the high standards imposed.

As with the pulp and paper industry, the chemical industry has sought new ways of improving productivity while using environmentally sound processes. Many of our customers started a care program some time ago and have determined that ozone is an excellent solution to their problems.

Product Focus


  • IGS™ dielectrics
  • Optimised mechanical design
  • State of the art IGBT power supply
  • Low harmonic current rejection
  • Low power consumption
  • High ozone concentration
  • Robust industrial quality
  • Compact dimensions
  • User friendly interface
  • Larger units with optional bus
  • Low maintenance

How Does It Work?


Large-scale ozone generation by dielectric barrier discharge

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.