The treatment system has consistently removed nitrate levels below the treatment goal
In September 2012, AdEdge Water Technologies LLC was awarded a contract managed by BG Consultants for the equipment pre-selection of a nitrate removal treatment system for the city of Green, Kan. The scope of the contract included the design, manufacture and startup of the treatment system. The city of Green is a small community of approximately 125 residents located in northeast Kansas. Water testing revealed a sustained nitrate level of 12 mg/L as N. The U.S. Environmental Protection Agency has set the maximum contaminant level at 10 mg/L NO3-N in drinking water. The town receives water from four wells, which alternate in operation.
The AdEdge treatment system was designed to treat 40 gal per minute and to remove up to a maximum of 25 mg/L of NO3-N (as required by the contract). The treatment system was packaged in a compact, skid-mounted unit, model APUIX-NO3-2472CO-3-290, utilizing three vessels arranged in parallel, each loaded with AdEdge ADIX-NO3 nitrate-selective anion exchange resin. Two of the vessels are always maintained in service, while the third vessel is offline in regeneration or in standby. The resin is supplied in the chloride form as moist, tough, uniform spherical beads and is NSF 61 certified.
System features include:
- Continuous on-line nitrate measurement on blended effluent;
- Modulating valve on bypass line provides a consistent blended effluent nitrate concentration not exceeding 7 mg/L as N, helping to extend regeneration frequency and improving efficiency;
- The ADIX-NO3 resin is regenerated with a brine solution; the wastewater is taken to sanitary sewer;
- System control provided by programmable logic controller (PLC) and human machine interface screen. PLC provides control of well pumps, chlorine dosing pumps, bypass valve and automatic regeneration operations;
- Remote monitoring including access to HMI screens, alarm notification via e-mail and SMS; and
- Differential pressure monitoring, local pressure gauges, flow sensors and a central hydraulic panel.
The system was started up in June 2014. The treatment system has consistently removed nitrate levels below the treatment goal of 10 mg/L as N since it began operation.
Richard J. Cavagnaro is marketing coordinator for AdEdge Water Technologies LLC. Cavagnaro can be reached at [email protected] or 678.835.0052.