In November 2009, AdEdge Water Technologies, LLC was contacted by Great West Engineering to provide an arsenic and iron removal system for the Gore Hill County Water Treatment Plant Wells #1 and #2 in Great Falls, Montana. The existing water system consisted of multiple wells feeding into a centralized distribution system with a maximum capacity of 150 gpm. The raw water for Plant #1 has an average arsenic level of 18 ppb and an iron level of 1.39 mg/L, well above the EPA MCLs of 10 ppb and 0.3 mg/L respectively. Plant #2 has an average arsenic level of 21 ppb and an average iron level of 4.51 mg/L, also well above the EPA MCLs of 10 ppb and 0.3 mg/L.
Each AdEdge treatment system features a skid-mounted AD26 oxidation and filtration package unit sized for a maximum design flow of 150 gpm. Gore Hill Plant #1 features the model APU26-4260CS-2-AVH and utilizes AdEdge AD26 media in a two vessel configuration. Gore Hill Plant #2 features the model APU26-4260CS-3-AVH and utilizes AdEdge AD26 media in a three vessel configuration. Each 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. A continuous feed of sodium hypochlorite is fed prior to the treatment system to optimize the removal of arsenic and iron. Each 42-inch diameter treatment vessel contains 28 cubic feet of AdEdge AD26 oxidation/filtration media.