In August 2011, AdEdge Water Technologies was contacted by WATEK Engineering to design, manufacture and start up a nitrate removal system and a softening system for the Northwestern Lancaster County Authority in Manheim, Pennsylvania.
There, the existing water system consisted of one well-feeding water at 225 gallons per minute (gpm) to an elevated storage tank that feeds the distribution system. The raw water has an average nitrate level of 12 mg/L, which is above the U.S. EPA primary maximum contaminant level (MCL) of 10 mg/L.
The resulting AdEdge treatment system fully integrates with other improvements to the Northwestern Lancaster Water Treatment Plant, which includes a membrane filtration system, two clear wells and a new well pump. The system features a skid-mounted ADNO3 anion exchange package unit sized for a maximum design flow of 350 gpm.
The model, APUNO3-5460CS-2-AVH, utilizes ADNO3 ion exchange media in a two-vessel carbon steel configuration in parallel. Each 54-inch diameter treatment vessel contains 55 cubic feet of the media, which is an NSF 61 certified anion exchange resin supplied in the chloride form as moist, tough, uniform spherical beads.
The AdEdge nitrate removal system features a bypass line rated for 100 gpm that blends the treated and untreated water to attain a blended nitrate concentration at the set point of less than 5 mg/L. The system was furnished complete with a regeneration/brine system to regenerate the ADNO3 IX resin once daily to maximize the efficiency in removing nitrates. Regeneration of the treatment system is automated by the programmable logic controller (PLC).
In addition to the nitrate treatment system, AdEdge provided a packaged softening system utilizing ADSOFT IX softening media rated for a maximum design flow of 50 gpm. The model, APUSOFT- 2465CO-2-285, utilizes AdEdge ADSOFT IX media in a two-vessel composite vessel configuration and uses treated water from the nitrate removal system to feed the brine saturator during regeneration and for the membrane filtration system clean-in-place. The systems are 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 systems started up and successfully began operation in May 2012.
Case Study Fast Facts
Client: Northwestern Lancaster County Authority
Facility: Northwestern Lancaster Water Treatment Plant
Engineer: WATEK Engineering
Location: Manheim, Pennsylvania
Date: May 2012
Contaminants treated: Nitrate/Hardness
Flow rate: 225 gpm