In 2009 AdEdge Water Technologies was selected by the U.S. EPA and the host site in Round 2a of the Arsenic Demonstration Program to implement a turnkey arsenic treatment system for Conneaut Lake Park (CLP) in Conneaut Lake, PA.
The CLP water system is served by two wells with a design flow of 250 gallons per minute (gpm). The wells provide potable water for a community with over 100 connections and a variable seasonal population. The system receives water on the good side of the storage tower with an arsenic level of 28 parts per billion (ppb), well above the U.S. EPA maximum contaminant level (MCL) of 10 ppb, as well as elevated levels of iron. From the 250-gpm well, water is treated by AdEdge treatment system, which is configured in parallel.
AdEdge was contracted to provide and manage all aspects of the project, including permitting with the local Department of Environmental Protection (DEP), design, fabrication, installation and startup activities. The system was AdEdge’s 12th full-scale EPA Arsenic Demonstration Project. AdEdge proposed and installed a treatment system designed to reduce arsenic concentrations to below the arsenic treatment standard of 10 ppb. The model, AD26-5460CS-S-3-AVH, utilizes coagulation/filtration technology deploying AD26 manganese dioxide media.
Since one of the wells has low natural iron content, the design included a ferric chloride injection module and a 100% backwash recycle system capable of filtering particulates and reclaiming all of the periodic backwash water for treatment and use. The packaged system features triplex 54-inch diameter carbon steel adsorption vessels mounted on a painted epoxy coated carbon steel skid, pre-piped and integrated. The system is placed after a pre-chlorination and ferric chloride module for oxidation of arsenic (III) to arsenic (V), and coagulation of iron and arsenic. The treatment system is equipped with automated control valves and harness, central control panel with programmable logic controller (PLC) and a color user interface screen. The system also features a hydraulic panel with local gauges and sample ports for a complete functioning packaged unit.
Since the full-time operation began in December 2009, the system has effectively reduced arsenic levels consistently to below 2 ppb, well below the MCL. Approximately 30,000 gallons per day (gpd) is being processed through the system on average. The site’s operator performs the routine sample collection and reporting associated with the U.S. EPA’s Demonstration Program requirements, with quarterly reporting of the data by EPA’s contractor Battelle.
Case Study Fast Facts
Client: Conneaut Lake Park
Location: Conneaut Lake, Pennsylvania
Date: December 2009
Contaminants treated: Arsenic, iron, manganese
Flow rate: 250 gpm