UV Water Disinfection In Fish Farms And Hatcheries

To protect fish farms and hatcheries from outbreaks of water-borne diseases, water treatment specialist Aquionics Limited has developed a high intensity UV disinfection system. Capable of treating up to 185,000 gallons/hour of both fresh or sea water with at least a 99.99% kill rate, the UV system can be used to treat both incoming and recirculation water, allowing flexibility in the choice of site and a rapid payback for farmers.

UV disinfection system for aquaculture

Increased water extraction and lowered water quality can result in increased outbreaks of viral and bacterial fish diseases. Due to the intensive nature of fish farming, fish stock is also highly susceptible to infection from natural fish populations in the water feeding the farm. To break the infection cycle between fish farms and natural fish populations, a disinfection system is needed to treat water entering and circulating within fish farms.

UV is ideally suited for these applications as it uses no chemicals and does not create by-products which would harm the fish stock, or other aquatic life, on discharge. Unlike other treatment methods, UV avoids the expense of complex monitoring systems involved in adding and removing chemicals before the water reaches the fish. In addition, it does not alter the pH of the water. Indeed, UV is the most economical disinfection technique that can be used in fish aquaculture. Applications include treatment of water in hatcheries, shell-fish purging tanks and fry rearing tanks, and recirculation water in marine parks and aquaria.

Maintenance of the system is restricted to the replacement of the UV lamp every 12 months, a simple operation that can be carried out by on-site staff. An automatic or manual wiper can be fitted over the quartz sleeve which surrounds the UV lamp to prevent the build-up of any deposits, ensuring maximum levels of irradiation at all times.

A significant feature of the Aquionics system is the new Photon control panel which displays a range of useful functions such as flow rate, UV dose and intensity. It is capable of logging up to one year’s performance data, which can be downloaded to a PC through an RS232 port. Linked into a central computer, the control panel can also be operated remotely, and allows the system to operate around the clock.

To date Aquionics has installed over 300 aquaculture systems in 14 countries around the world. Applications include water treatment in hatcheries, fish farms (salmon, sea bream and sea bass) shellfish depuration tanks and fry rearing tanks as well as treating re-circulation water in marine parks and aquaria.

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Greenhouse Operator Chooses Aquionics UV To Disinfect Cultivation Water

Aquionics UV technology has been selected by NZ Hothouse, a leading New Zealand provider of fresh produce, to disinfect the water used for soil-less plant cultivation in its glasshouses.

UV system for treating greenhouse water

Located near Auckland on North Island, NZ Hothouse has almost 50 acres of glasshouses on two sites growing tomatoes, capsicums and cucumbers for distribution both nationally and internationally.

The source of the water is a combination of rain water and borehole water, which is stored in large outside holding ponds. The main microbial challenge organisms in the water include fungi such as Pythium, Phytophthora and Fusarium, bacteria such as Clavibacter, and viruses such as tomato bronze (wilt) virus and tomato mosaic virus.

No conventional microbiological checks are carried out, but NZ Hothouse uses what it calls ‘bait tests’ with very young plants to see if they fall victim to any of these water-borne pathogens.

Two Aquionics PMD200 medium pressure systems are installed – one for each site – treating up to 18,000 gallons of water per hour. UV treatment is ideal for this application as it is a completely clean technology that introduces no chemicals or unwanted disinfection by-products into the water and does not alter its pH.

The UV systems feature an automatic wiper which prevents the build-up of deposits on the quartz tube, ensuring optimum UV dose at all times. Photon control panels provide the operators with data on flow rate, UV dose and intensity and can log up to one year’s performance data, which is downloadable to a PC via an RS323 port. The control panel can also be operated remotely, allowing the system to run 24 hours a day. Maintenance of the unit is restricted to the replacement of a lamp every 12 months, a simple operation that can be carried out by on-site staff.

All Aquionics UV disinfection systems are easy to install, with minimum disruption to the plant. They need very little maintenance, the only requirement being replacement of the UV lamps and servicing of the wiper systems every 12 months, depending on use.

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