In 2003, AdEdge Water Technologies began working closely with EarthTech, the engineering firm responsible for specifying and selecting water treatment systems for the National World War II Memorial in Washington, D.C. Stormwater and groundwater control and treatment were essential aspects of this project, given the location of the site adjacent to the reflecting pool and other monuments. Based on experience and approach, AdEdge was contracted by Walsh Construction, the general contractor, to provide an integrated groundwater treatment system for this high-profile project.

The needs for treatment arise for shallow groundwater collected by the subsurface drainage system inside a bentonite slurry cut-off wall surrounding the 11-acre site. Primary contaminants for treatment include iron, manganese and arsenic. Water must be extracted and treated to meet NPDES permitted discharge limits before final conveyance to the Potomac River, which is below EPA drinking water maximum contaminant levels. The systems were located 20 feet below the memorial in a secured concrete vault containing other conveyance piping, pumps and support systems for the memorial.

The AdEdge systems consist of two parallel skid-mounted systems rated for 30 gpm, each capable of removing contaminants of concern. Each treatment train includes an AdEdge AD26 iron removal system and an arsenic package unit (APU) for arsenic treatment to attain the stringent discharge limits. Water is pumped from groundwater feed to the dual vessel AD26 system following inline hypochlorite (chlorine) injection. Hypochlorite solution is fed inline through a computer controlled metering and feed system capable of real time chlorine residual measurement and control. Iron and manganese are oxidized and filtered/adsorbed with the proprietary AD26 catalytic media based system. Treated water, free of iron and manganese from the AD26 systems, flowed through the respective APU adsorption system containing GFO media. The media is an NSF 61-certified, granular ferric oxide media specifically engineered for arsenic removal. Attractive features of the system are the small footprint, long media life, simplicity and minimal required operator attention.

Each of the skid-mounted systems is equipped with automatic controls, backwashing features, switches and sample ports for complete functioning packaged units. Instrumentation is provided on a control panel to measure critical operating parameters. Total gallon throughput and flow rate for each unit is measured continuously with a dedicated flow totalizing meter. The AdEdge adsorption system requires no chemicals, regeneration, and does not generate liquid or hazardous waste. Media, when spent, is discarded as nonhazardous solid waste.

The system was placed into operation in June 2004 and is operated by the National Park Service.

About AdEdge Water Technologies
Founded in 2002 and headquartered just north of Atlanta, Georgia, AdEdge Water Technologies specializes in the design, development, fabrication and supply of packaged treatment solutions, specialty medias, innovative technologies and membranes that remove contaminants from process or aqueous streams. AdEdge has extensive experience in the removal of arsenic, iron, manganese, hydrogen, sulfide, fluoride, nitrate and uranium from water. For more information, call 866/823-3343 or visit www.adedgetech.com