Wednesday, August 24, 2016

24/08/2016: UV technology in aquaculture

by Michael Annett, Sales/Business Manager UV Systems, Pentair Aquatic Eco-Systems

When designed, installed and maintained properly, UV systems are extremely robust, reliable and effective. Pentair Aquatic Eco-Systems (PAES) is a leading manufacturer of UV water treatment systems for use in a range of industries.

PAES has particular expertise in designing and supporting UV systems in aquaculture field applications. In addition to new installations, PAES also provides consulting and support for UV systems that are installed in existing aquaculture facilities.

Enclosed UV Reactors

UV treatment has been used successfully for approximately six decades to treat and sanitise water in many critical applications. In this article, we will describe the array of UV system configurations along with their associated lamp technologies, to serve as a high-level guide to important design and operating considerations for UV systems.

UV process discussion Ultraviolet or UV energy is located in the electromagnetic spectrum with a wavelength shorter than that of visible light and longer than x-rays. When UV systems are deployed to treat water, the reactions are instantaneous, taking only a few seconds to occur, without the creation of disinfection by-products. Chemicals are not required and the associated hazards of chemical handling and storage are not present.

UV treatment does not alter colour, odour, taste or pH. As such, UV processes are environmentally safe and are considered ecologically-responsible technology. The science behind UV technology is well-established; and its efficacy is well-proven. UV systems are trusted in a wide range of industries including drinking water production, aquaculture farming and other applications.

UV light is comprised of electromagnetic radiation of wavelengths ranging from 100nm to 400nm:

•             UV-A (long wave UV): 315-400nm
•             UV-B (middle wave UV): 280-315nm
•             UV-C (short wave UV): 200-280nm
•             Vacuum UV: 100-200nm

When a UV system is used to treat water, UV light at the 254nm wavelength penetrates the cell wall of microorganisms that are present in the treatment water. The amount of UV delivered to the organism is called the dose. The UV energy permanently alters the DNA structure of the microorganism in a process called thymine dimerisation.

The microorganism is not destroyed, rather it is ‘inactivated’ and rendered unable to reproduce or infect.

Read the full article HERE.

The Aquaculturists
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