To treat its arsenic and iron problem the Gore Hill County Water Treatment Plant turned to AdEdge Water Technologies. Here's how they achieved undetectable levels of the contaminants.

In November 2009, AdEdge Water Technologies 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 uses AdEdge AD26 media in a two-vessel configuration. Gore Hill Plant #2 features the model APU26-4260CS-3-AVH and uses 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 before 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.

In addition to the arsenic and iron treatment systems, AdEdge is providing a recycle backwash system for each site. The backwash recycle system reclaims 100 percent of the backwash wastewater and removes the captured arsenic and iron as a semisolid sludge that can be disposed of in a nonhazardous landfill. Backwashing of the treatment systems occurs two or three times a week depending on the incoming levels of iron and water usage.

Related: Guest Blog: Q&A: How Does Arsenic Affect Our Water Systems?

The system was started up and commenced in April 2011. Since the system began operation, iron levels are at nondetectable levels and arsenic levels have lowered from 18 ppb and 21 ppb to nondetectable levels.

Fast Facts

  • Client: Gore Hill, Montana
  • Date: April 2011
  • Contaminant: Arsenic/Iron
  • Flow Rate: 150 gpm

About AdEdge Water Technologies
Headquartered just north of Atlanta, Georgia, AdEdge Water Technologies specializes in the design, development, manufacturing and supply of innovative water treatment solutions that remove contaminants from process or aqueous streams. AdEdge offers a full range of conventional and innovative treatment technologies to achieve trough standards including adsorption, coagulation, ion exchange, biofiltration and membrane-based solutions. For more information, visit

Related: Guest Blog: Q&A: How Customized Treatment Systems Can Solve Your Arsenic Problem

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