EDS Pumps
Pumps & Water Treatment Newsletter
September
2010
Did you Know?lemonade
Frozen water is 9% lighter than water, which is why ice floats on water.
In This Issue
TIPS FOR MAINTAINING YOUR WELL
WATER TREATMENT NEWS
ASK AN EXPERT
TIPS FOR MAINTAINING YOUR WELL
Use a Secure Well Cap -
well cap to prevent direct and unintended entry into the well of any water or undesirable substances at the surface of the ground, including floodwater, ponded water, and contaminants.
Read more
WATER TREATMENT
Bacteria: PRIMARY HEALTH CONCERN
BACTERIA CELLWhat are Total, Fecal and E. coli bacteria?
Coliform bacteria are described and grouped, based on their common origin or characteristics, as either Total or Fecal Coliform. The Total group includes Fecal Coliform bacteria such as Escherichia coli (E .coli), as well as other types of Coliform bacteria that are naturally found in the soil. Fecal Coliform bacteria exist in the intestines of warm blooded animals and humans, and are found in bodily waste, animal droppings, and naturally in soil. Most of the Fecal Coliform in fecal material (feces) is comprised of E. coli, and the serotype E. coli 0157:H7 is known to cause serious human illness. READ MORE

UV TREATMENT IS AN EXCELLENT WAY TO TREAT BACTERIA.
Although 100% destruction of microorganisms cannot be guaranteed, it is possible to achieve 99.99% reduction in certain applications and with proper maintenance.

SEE OUR ARTICLE ASK AN EXPERT FOR MORE ON UV TREATMENT

ASK AN EXPERT
UV Treatment
Dave Mellis CWS V
DAVE MELLIS OWNER

This month we have talked a bit about Ultra Violet as a disinfecting agent for drinking water. Ultra violet has a number of advantages over traditional disinfectants such as chlorine or chloramines however like anything else it must be applied properly. We see a number of customers who want to treat their water with a UV device because it is so simple to install, easy to maintain and relatively cheap to purchase but without doing the proper checks and tests, you could be buying a lot of problems.

Ultra violet light or UV, is suitable for residential, commercial and industrial markets. Surface water from lakes, rivers or shallow wells is typically exposed to more sources of contamination than deeper wells. And they are also subject to wider fluctuations in water quality due to runoff and seasonal effects. These water sources are also a source of waterborne diseases caused by pathogenic bacteria and viruses. These microbes can be easily inactivated by UV.

The mechanism of UV disinfection is the same for all UV systems. Microbial inactivation is caused by the damaging effect of UV light on the microbes DNA. In the case of pathogens, the resulting damage prevents the microbe from multiplying thus destroying their ability to infect and cause disease such as cholera, typhus and other gastro-intestinal diseases commonly associated with contaminated water sources.

UV has the ability to inactivate bacteria, viruses and protozoa. However each type of organism requires a specific "dose" for inactivation and typically viruses require higher UV doses than bacteria and protozoa. UV dose is the product of light intensity and exposure time, the time the water resides in the UV reaction chamber.

The UV dose is usually given in units of microWatt seconds per square centimeter. For most residences a range of 16,000-30,000 mW/cm is acceptable and will inactivate 99.99% of all bacteria, protozoa and viruses including cryptosporidium and giardia (Beaver fever).

Key factors which impact the performance of a UV system are water quality, pretreatment and UV design.

UV is highly effective when the water is low in iron, manganese, hardness and has a high UV transmittance. UV transmittance is commonly referred to as UVT and refers to the waters ability to transmit UV light. Various organic and inorganic compounds that may or may not be visible can absorb UV and decrease the amount of UV energy for disinfecting. All water should be tested for UVT before it should be considered as a disinfection method. Typically most water with a UVT of 75% or higher is required. Your water treatment professional can usually perform this test with the proper analyzer.

A comprehensive water test is an absolute necessity for sizing a UV system. As mentioned, water quality is paramount for the successful operation of a UV system. As elevated levels of minerals such as iron or hardness can form a film on the UV sleeve reducing the UV dosage below the "kill zone". Again, your water treatment professional can test for these parameters and make any recommendations should pretreatment be needed. In addition, all UV manufactures require a minimum 5 micron sediment filter before the UV system and will also recommend a carbon filter to reduce undesirable tastes, odors and organic compounds.

You can read more about UV on our website at edspumps.com

Drop into our store for a free UVT test!

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