What is Far UVC
This Norwegian Institute of Marine Research trial was done with UVC that concluded following (We have demonstrated that sufficient doses of UVC irradiation can dramatically reduce production of infective stages from salmon lice egg strings). The test was carried out in PVC tanks with 16% reflectivity.
The limit for an efficient UV lamp is 40% energy output, lamp energy below this is considered as defective. Reflectivity is measured from 40% lamp energy and up and materials with 30% only have 4 reflections.
Our Biotunnel is lined with highly optic reflective sheets with 98% reflectivity that gives 45 to 50 highly scattering reflections, this makes it 10 times more efficient than polished aluminum sheets with 70% reflectivity and 14 times more efficient compared to PVC tanks. In addition the 222nm Far UVC require 5-10 times less radiation compared to 254nm UVC and significantly shorter irradiation time.
The highly scattering UV light fills the Biotunnel completely without any shadow areas resulting that all passing fish will be treated completely without any untreated parts. Both salmons and trouts have UV receptors that can see the unvisible UV light and will be drawn to it. The units can be on 24/7 and do not do any damage to fish eyes or skin. It will take longer time for all fishes to pass through the tunnel but the treatment will be far better. Pancreatic disease (PD) and infectious salmon anemia (ILA) will also be eliminated. With UV reflectors made of Electropolished Super Duplex, adult sea lice will also be deactivated.
The maximum permissible Far-UVC exposure according to current EU regulations is 30 mJ/cm² in 8 hours. Despite the fact that this norm is established for the entire UV spectrum of radiation, it is quite sufficient for disinfection.
Size and power
Tunnel size is 1200mm internal diameter and a 6 meter unit with 4 tunnels weight is around 1.400kg, the tunnel walls have floating elements and is balanced according to depth.
Power usage for a 6 meter unit with tunnels is 12VDC 640 Watt.