UV Disinfection in Aquaculture

How Does Ultraviolet Work?
Ultraviolet energy causes permanent inactivation of micro-organisms by disrupting DNA so that they are no longer able to maintain metabolism or reproduce. The maximum effectiveness occurs at between 240nm and 280nm, with the most effective wavelength typically at 254nm. The Sukrut UV Spektrotherm HP lamp produces this wavelength in abundance. All bacteria, spores, viruses and protozoa (including Cryptosporidium and Giardia oocysts) are permanently inactivated by UV.

Stressed animal stock is more vulnerable to infection from a host of pathogenic species. UV can assist with the elimination of these pathogens.

Application for UV

  • Tank Water
  • Feed Water
  • Process Water
  • Odour Abatement
  • Effluent Disinfection

Most Efficient

  • Bacteria, viruses, moulds, spores are all inactivated by UV. Treatment is effectively monitored and fully automatic
  • Permanent accurate treatment records can be produced, so all treatment can be traced and applied dose demonstrated
  • No contact tank is required
  • UV is effective against all fish, seal, penguin and whale pathogens and will de-activate all water borne pathogens
  • Several fish pathogens eg. VHS, IPN, IPA, UDN, PKD, FURUNCULOSIS AND Vibrio are destroyed at a UV dose of 600-900 J/m

Superior to Alternatives

  • Chlorine and ozone are becoming less acceptable because of harmful by-products and handling problems
  • UV is an environmentally friendly way to eliminate bacteria etc, without chemicals
  • UV is the most cost-effective method of water disinfection, requiring minimal servicing
  • UV is simple and automatic. The only consumable is electricity
  • No contact tanks are needed with UV so space requirement is modest.
  • UV is a simple and inexpensive plant, which fits into existing buildings
  • Low capital, operational and maintenance costs

Controls
Treatment is achieved by UV dose. This is computed from the UV intensity measured by the monitors, the water flow rate and the built-in measured transmittance.
Power to the Spektrotherm lamps can be varied to ensure that the desired dose is obtained at all times, while keeping running costs to a minimum.
Entire system can be controlled locally or remotely, providing continuous and precise management information to the central control System will automatically switch to standby unit when required UV dose and lamp intensity can be data logged.

Water Quality

  • UV disinfection can be designed for almost any water, and is therefore not restricted to high quality borehole or surface waters
  • An optional automated wiping system is used for keeping the quartz surface free of deposits so that UV effectiveness is maximized
  • A built-in Transmittance Monitor measures changes in water quality and is used for control of dose level and maintenance of the unit

UV Systems
Selection of the appropriate UV model for each application should be decided in conjunction with a Sukrut UV specialist, who will also advise on the installation and dose.