Ultra-Violet Sterilisation

U.V. is a proven means of addressing microbiologically contaminated waters. This simple and safe technology is suitable for small flow rates i.e. domestic applications and large flows for commercial and industrial uses.

These units produce ultraviolet light of 254 (nm), by converting electrical energy through the use of a low pressure mercury vapour lamps. (Commonly called U.V. Bulbs or U.V. Lamps.) These lamps are similar in design to standard fluorescent lamps with a few exceptions. The U.V. lamp is manufactured with Quartz glass which allows for the transmitting of 90% of radiated energy. Fluorescent lamps also contain a thin coating of phosphor inside the lamp which converts the U.V. to visible light.

Microorganisms encompass a wide variety of unique structures and can be grouped into five basic groups.

• Bacteria
• Virus
• Fungi
• Protozoa
• Algae

FACTORS AFFECTING U.V.

Suspended solids:

This can cause a shielding problem in which a microbe may pass through the unit without having any direct U.V. penetration. This problem can be reduced by mechanical filtration down to at least five microns.

Iron/Manganese:

Iron will cause staining of the Quartz sleeve with levels as low as 0.03 ppm and levels of manganese should not exceed 0.05 ppm. This staining will inhibit the transmittion of U.V. light through the water in the chamber. If these problems exist then pretreatment will be required.

Calcium/Magnesium:

These will cause scale to form on the quartz sleeve and will be magnified during times of low or no flow. This scale will inhibit the transmittion of U.V. light through the water in the chamber. If these problems are present they can be easily remedied by the use of an ion exchange softener.

Other absorbing compounds:

Compounds such as humic and fumic acids as well as tannins will reduce the amount of U.V. energy available to penetrate through the water and alter the DNA of the molecule.

BENEFITS

• Environmentally friendly, no dangerous chemicals to handle or store and no danger of overdosing.
• Low running costs when compared to chemical treatment.
• Immediate treatment, no need for retention times and holding tanks.
• No chemicals added to the water, no change in taste, odour, pH, or conductivity.
• Easy installation.

INSTALLATION

DATA SHEETS

Standard features include:

• Audable Ballast with LED lamp out indicator.
• High output low pressure mercury vapour lamps with high isolation pin design.
• Compact design with 304 or 316 stainless steel reactor chamber, polished for laboratory and medical use.
• Easy servicing - no need to turn off water flow to change U.V. lamp.
• Open end quartz sleeve and aluminum gland nuts for optimum operating temperature and sealing efficiency
• Mounting clamp included.
• Seven year warranty on reactor chamber.