In July 2010, AdEdge Water Technologies was contacted by Engineering Resources to design, manufacture and install a uranium water treatment system for the Arrowbear Park County Water District in the San Bernardino National Forest. The community's water system has a raw water uranium concentration of 118 parts per billion (ppb), well above the U.S. EPA maximum contaminant level (MCL) of 30 ppb.
The AdEdge treatment system features a skid-mounted AD92 ion exchange package unit sized for a maximum design flow of 200 gallons per minuet (gpm). The model, AD92-4260CS-2-AVH, utilizes AD92 media in a two-vessel carbon steel configuration in parallel. The system is equipped with automated control valves and harness, central control panel with programmable logic controller (PLC) and a color user interface screen. System features also include differential pressure switches, control panel and local gauges, flow sensors and totalizers and a central hydraulic panel with sample ports for a complete functioning packaged unit.
The regenerative AD92 ion exchange approach was the preferred and most cost-effective option for the site, and this technology has been designed to provide high-efficiency removal of naturally occurring uranium from groundwater supplies. The system is furnished complete with a regeneration/brine system to regenerate the IX resin periodically on demand. A sodium chloride (brine) solution is used to regenerate the anion resin. The brine module is a separate system composed of a single polyethylene brine tank with valves, flow restrictors and rotometers, which work during the automatic cycle operation, service, backwash, brining, slow rinse and fast rinse cycles. Chlorine is injected into the water for disinfection after the uranium treatment unit into the distribution.
The system started up and commenced in January 2011. The AD92 IX media can selectively remove the negatively charged uranium anion to below the state and federal MCL of 30 ppb. Since the system began operation, the uranium concentration is at a non-detectable level.
Case Study Fast Facts
Client: Arrowbear Park County Water District
Location: Arrowbear Lake, CA
Date: December 2009
Contaminant treated: Uranium
Flow rate: 200 gpm