UV Disinfection systems
Ultraviolet drinking water Disinfection is recognized as effective by the US EPA, World Health Organization and other leading health organizations.
The UVDynamics model UVD320E is applicable to point of entry installation in homes and cottages. The UVD320E has only basic visual and audio alarm indicators and is ideal for general disinfection applications. The compact mounting footprint of the UVD320E facilitates installation where space is limited. The UVDynamics model UVD320E was designed using sophisticated computer modeling software and then verified by independent third-party testing using accepted biodosimetry methods by GAP EnviroMicrobial Services.
HOW LONG HAS UV WATER DISINFECTION BEEN IN USE
The first recorded use of UV water disinfection was in 1906 with a municipal installation in Anon, France. Residential application of the process was given renewed interest during the 1950’s and has been growing at a rapid rate ever since. The technological problems and uncertainties faced by the early pioneers have all been resolved and today’s UV equipment is not only competitively priced, but offers low maintenance and low operating cost compared to other disinfection methods. It is the disinfection method of choice for most residential applications.
WHO SHOULD USE UV WATER DISINFECTION
Anyone who receives their water from a private well or surface water needs to disinfect. In many areas, we can no longer assume the safety of our water source with the ever-increasing effects of agriculture and industry.
HOW DOES UV DISINFECT WATER
When disease-causing microorganisms are exposed to UV light their DNA is disrupted, disabling the microorganism’s ability to replicate and cause illness.
WHAT IS UV DOSE
UV dose is the function of both the intensity of the UV radiation and the length of time the water is exposed to the UV radiation. UV dose is expressed in millijoules(mj)/centimeter squared (cm2)
WHAT UV DOSE DO I REQUIRE
UV disinfection equipment is being manufactured to a number of different dose standards and it is important to know the dose being used when flow rates are specified. The oldest standard still in use is the US Department of Health standard which recommends a dose of 16mj/cm2. This dose is still considered acceptable for applications where the UV disinfection device is used to treat for nuisance organisms that colonize filters and water softeners when used with municipal water sources. For many years the industry used a standard of 30mj/cm2 for primary disinfection. More recently leading authorities (including the US EPA and NSF) have adopted a dose of 40mj/cm2 for primary water disinfection. We highly recommend the 40mj/cm2 for all installations where the water source is a private well or surface water and a dose of 30mj/cm2 for all applications with municipal water supply.
CAN I DO MY OWN INSTALLATION
Where local regulations allow and you have basic plumbing skills UVDynamicsTM equipment can be DIY installed. Please review the downloadable PDF format installation instructions for more detailed information.
WHAT ARE THE OPERATING COSTS OF A UV DISINFECTION SYSTEM
The UV system uses about as much electrical energy as a 40watt light bulb.
DOES THE UNIT NEED TO BE ON CONTINUOUSLY
Yes, The UV lamp needs to operate for several minutes to reach full UV output. Excessive on/off cycling of the UV lamp will greatly reduce its life expectancy. Additionally, by having the unit on continuously the chance that untreated water will be consumed is minimized.
WHERE DO I INSTALL THE UV DISINFECTION UNIT
UV disinfection equipment should always be the last stage of any water treatment system and should be installed so that both the cold water distribution system and the hot water heater receive disinfected water.
CAN I INSTALL A BYPASS VALVE
Yes, if desired a bypass valve can be installed.
I AM INSTALLING THE UNIT IN A COTTAGE
UV disinfection is becoming very popular for cottages and summer residences. If your UV system is not going to be in use for several months, you can shut it down during absences. Provided you disconnect the UV disinfection system from the AC power source and completely drain the disinfection chamber in areas where freezing temperatures are possible, the lamp should last for the full 9000hrs. When used in this manner the quartz sleeve should be cleaned annually and the UV lamp should be replaced after two years regardless of hours of use. We do not recommend disconnecting the unit from the AC power source in situations where the cottage will be used on a regular basis e.g. every weekend.
I HAVE MUNICIPAL WATER – DO I NEED UV DISINFECTION
The majority of municipal water providers do an excellent job of providing a safe, reliable supply of water to their customers. If you have any reason to feel that your water provider is not in this group you may wish to install a UV disinfection system to provide additional water supply security for yourself and your family. If you are using a whole house point of entry activated carbon filter to reduce chlorine and other contaminants, then the use of a UV water disinfection device after the activated carbon filter is highly recommended as micro-organisms are known to colonize in these filter media. It is for this reason that many of the available countertop and pitcher filter devices recommend frequent media changes in their user instructions.
IS WATER PRE-TREATMENT REQUIRED
The UV disinfection is a physical process and the microorganisms need to be exposed to a minimum level of UV energy for effective disinfection. To ensure low maintenance reliable operation, the water to be treated must not contain any elements which significantly reduce the UV transmission of the water or elements which will form a deposit on the quartz sleeve which will lower the amount of UV light energy in the disinfection chamber. Water, which meets the following minimum guidelines, generally requires only an annual maintenance interval, consisting of lamp replacement and cleaning of the quartz sleeve.
Turbidity < 1 NTU
Suspended Solids < 10mg/L
Total Iron < 0.3 mg/L
Manganese < 0.05 mg/L
Hardness < 7 gpg
If you are unsure as to whether your water source meets the required minimum standards, we suggest you have a sample of the water analyzed by a local water testing laboratory. We highly recommend, as a minimum, the installation of a 5 micron pre-filter before all UV disinfection equipment. If your water needs pretreatment in addition to the 5 micron prefilter we would suggest you consult with a local water treatment dealer who is familiar with water conditions in your area.
HOW LONG DOES THE UV LAMP LAST
The UV output of the UV lamp decreases slowly with age and has a useful life of 9000 hours. Beyond 9000 hours the lamp output starts to degrade rapidly and disinfection performance will be suspect. UV Dynamics disinfection units are designed to provide the specified dose at the end of the useful lamp life. The integral lamp change reminder alarm will inform you of the necessity of changing the lamp. Operating the lamp beyond 9000 hrs will result in ever reducing disinfection performance.
DO I NEED TO REGULARLY TEST MY WATER
Yes, even with a UV disinfection unit installed regular water testing is still required to verify the safety of your entire water distribution system.