Editor-in-Chief Elisabeth Lisican showcases a handful of features to read in the April 2017 issue of Water & Wastes Digest.
AdEdge Technologies Inc. was selected in 2007 by the U.S. Environmental Protection Agency (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, Ind. The Clinton Christian School water system is served by one well with a design flow of 25 gal per minute (gpm). The well provides potable water for the school with a population of 130 students and 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 parts per billion (ppb), above the EPA MCL of 10 ppb.
AdEdge was contracted by the 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 eleventh 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-in.-diameter composite filtration package plumbed in a parallel flow prior to the dual 24-in. 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. More than 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 consistently been < 2 ppb. Approximately 2,500 gal per day is being processed through the system on average. The site’s operator performs the routine sample collection and reporting associated with the EPA’s Demonstration Program requirements with quarterly reporting of the data by EPA’s contractor, Battelle. An EPA summary report is available on the EPA website.