Friday, May 7, 2010

AdEdge Treatment System Solves Arsenic Issue for Indiana School

AdEdge was selected in 2007 by the U.S. EPA and the host site in the Round 2a Arsenic Demonstration Program to implement a turnkey arsenic treatment for the Clinton Christian School in Goshen, IN. The Clinton Christian School water system is served by one well with a design flow of 25 gpm. The well provides potable water for the school with a population of 130 students / staff members. The treatment system receives water on the well side of the storage tanks with an elevated iron level of 0.81 mg/L, high manganese of 0.10 mg/l and an arsenic level of 29 ppb, above the EPA MCL of 10 ppb. AdEdge was contracted by U.S. EPA to provide and manage all aspects of the project including permitting with IDEM, design, and fabrication, installation, and startup activities. The system was AdEdge’s 11th full scale EPA demonstration project.

AdEdge proposed and installed a hybrid style treatment system designed to reduce iron, manganese and arsenic concurrently to below primary and secondary MCLs. The system utilizes an AD26 Oxidation/Filtration pretreatment technology followed by granular ferric oxide adsorption deploying Bayoxide® E33 GFO media. The design also includes a backwash management system capable of removing residual chlorine from the periodic backwash water to comply with the site’s NPDES discharge permit. The packaged modular system features a triplex 13-inch diameter composite filtration package plumbed in a parallel flow prior to the dual 24-inch composite module containing AdEdge Bayoxide® E33 adsorption media. The system is placed after a pre-chlorination module for oxidation of iron and manganese, as well as arsenic (III) species. The modular treatment system is equipped with automatic controls, backwashing features, switches, gauges, flow meters, and sample ports for a complete functioning unit.

Since full time operation began in February, 2008, the system has effectively reduced iron, manganese, and arsenic well below primary and secondary MCLs. Over 95% of iron and manganese and 85% arsenic reduction is being accomplished with the AD26 pretreatment technology. Arsenic in the final treated water following adsorption has consistantly been < 2 ppb. Approximately 2,500 gallons per day 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. A EPA summary report is publically available on the EPA website.

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