AWWA CEO David LaFrance thanks water professionals nationwide for keeping water safe for drinking
Dec. 16, 2014, marked the 40th anniversary of the Safe Drinking Water Act (SDWA), which today includes regulations for more than 90 contaminants. American Water Works Assn. (AWWA) CEO David LaFrance issued the following statement to mark the occasion.
New Gardena, Calif., location provides more space and the ability to stock a larger inventory
ResinTech Inc. relocated its West Coast facility to the South Bay section of Los Angeles in Gardena, Calif.
The resin removes hexavalent chromium from groundwater
ResinTech Inc. received the Water Quality Assn.’s Gold Seal of approval for its chromate-selective resin, ResinTech SIR-700. ResinTech SIR-700 now meets NSF/ANSI-61: Drinking Water System Components — Health Effects for use in all potable water applications.
CGS is a light-colored, high-capacity, gel-type, sulfonated, strongly acidic, polystyrene cation resin supplied in sodium form as moist, tough, uniform, spherical beads. It is intended for use in all water softening applications, including beverages, potable water and food processing. Its high capacity and DVB content provide long life.
Water softener resin is extremely porous, which is beneficial because it allows for more surface area to capture calcium and other metals in source water. Surprisingly, 99% of ion exchange actually happens in the interior of the bead. Resin beads, ranging in size from 16 to 50 mesh, are abused daily during the backwash process and by contaminants in the source water. Resin could last much longer in these hostile environments with a few fairly inexpensive solutions.
Cleaning options to reduce resin fouling
The most common question from customers of water treatment systems utilizing adsorbent media is, “How long will the media/system perform?” The most common answer may be a number of months or years but should be more elaborative than a mere number. The most honest answer is, “It depends on the water chemistry.”
New test improves prediction of system and media performance
Ion exchange resins used in softening, anion or deionization applications are designed to remove certain ionized substances from water. The resin beads typically range in size from 16 to 50 mesh (1.2 to 0.3 mm) and although they are designed for the removal of dissolved ions, they can become a very effective filter media.
In some specialty applications (e.g., condensate polishing) resins are used as much for their filtration properties as for their ion exchange characteristics. For the most part, however, it is a good idea to keep the resin bed free of suspended particles.
Cleaning and prevention to avoid fouling
Purolite’s potable range of products addresses applications ranging from arsenic, perchlorate and nitrate to advanced multicontaminant removal. These products are available in several customized grades to meet the demands of customers.