Disinfection Systems

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There are various methods of water disinfection and their selection and use will depend on the application. Commonly, we use one or a combination of the following:

Ozone

Ozone is a powerful, rapidly acting sanitiser. Applications using ozone are related to its strong oxidising potential, its ability to eliminate many problems of odour, taste and discolouration of water supplies; and the fact that, on decomposition, it forms only oxygen. Ozone is a very strong oxidiser, requiring less time and lower concentrations than most other agents such as chlorine, chlorine dioxide and hydrogen peroxide.

  • There is no taste or odour residual after the ozone has decomposed.
  • Flocculation efficiency is increased with ozonation of water prior to filtration.
  • Ozone is essentially pH neutral and prevents scale or corrosion in treated water systems.
  • As Ozone is produced on site; there is no storage of chemicals required and low running costs as no bottled oxygen is required.
  • Ozone injection into treated water systems is automatic requiring minimal operator intervention.
Ultraviolet Light systems

For the past 100 years science has recognized the bactericide effects of the ultraviolet area of the electromagnetic spectrum. The specific wavelengths responsible for this reaction are situated between 240 - 280 nanometers (referred to as nm) with a peak wavelength at 265 nm. They are known as UV-C.

When a micro-organism is exposed to UV-C, the nuclei of the cells are modified, due to photolytic processes. In result, cell division and, by extension, reproduction is prevented. The Ultra Violet source is basically a fused silica quartz tube, typically 15 mm to 25 mm diameter ranging from 100 mm-1200 mm long. The inert gas with which the tube is filled, provides the primary discharge and the necessary action to excite and vaporize the miniscule deposits of mercury within. The low pressure UV lamp is only capable of producing lines at 185 nm and 254 nm.

Chlorine dosing systems

Chlorine is one of the most common disinfectants used in water purification. It is relatively cheap and easy to use and monitor.

Proportional dosing pumps can be used to dose a variety of chemicals into water. These chemicals are mainly used for pH control and disinfection using liquid chlorine.

A packaged system including controller can be used to monitor and dose chemicals to predetermined set points and maintain these levels automatically. In addition, in some areas, our MicroChlor chlorine generation system generates sodium hypochlorite on site mean no dangerous chemicals stored or transported.

Additionally, Ozone or UltraViolet can form the final stage in a multi-stage integrated system, designed and maintained by Continental Water.

 

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