Submersible UVc unit
Waterproof UV tube light that can be submerged in water. Kill micro organisms and increase water visibility.
Submersible UV-S75 unit
- Task: Kill micro organisms and increase water visibility.
- Description: Waterproof UV tube light that can be submerged in water.
- Benefits: Keep pathogen concentrations low and increase visibility.
- Models: UV-S75 (Submersible, 75 Watt)
- Material: Quartz glass mantle, polymer body
- Shape: 750 mm long tube with plastic handle
- Extra: Includes UV protection glasses and gloves to handle UV tube light
UVc light in the wave length range of 240-280 nm has the property to damage organic molecules and, more specifically the DNA and RNA of microorganisms. If the dose is high enough it can disrupt reproduction of microorganisms or even kill them and is commonly used to disinfect water.
UVc light is invisible for the human eye. It must be handled with care because the light can burn human skin and cause so-called “welding eyes”, or photokeratitis.
In aquaculture UVc is used to keep concentrations of pathogenic bacteria and viruses in the water low. Larger organisms like fungus, molt or yeast can be killed as well, but this requires much higher doses. At the same time it can increase visibility in the water by breaking down organic colorants, such as humic acids. UVc is also effective for ozone destruction.
The UVc output of a UV light reduces over time. General recommendation is to replace the tube light or bulb every 8000-9000 hours. At this time a low pressure bulb as shown in Fig.1 still has 85% of the original UVc output.
In watertreatment a common target dose of UVc light is 30 mJ/cm2. This dose is sufficient to achieve a 99.9% kill of bacteria, molts and virusses. A 75 Watt submersible unit as shown above is capable of handling a water flow of 10 m3/hr.