Michigan School District Removes Arsenic from On-Site Well

Challenge

After the Environmental Protection Agency (EPA) reduced the Maximum Contaminant Level (MCL) for arsenic presence in drinking water from 50 ppb to 10 ppb. The Pinckney School District sought a solution for treatment of arsenic, tested at 20-25 ppb, and to be compliant with the new requirements.

Solution

Evoqua Water Technologies ran an on-site pilot system to demonstrate to the State Department of Environmental Quality (DEQ) that the proposed Arsenic removal solution would perform as stated. During a 90-day period, Evoqua pilot tested with Granular Ferric Hydroxide (GFH™) me​dia​. Using the results gathered, Evoqua technical staff evaluated the same process using ADSORBSIA™ GTO™ media. A determination was made that the DOW product offered a superior cost value and operational advantage for this customer's process needs.

The Evoqua solution features duplex 24" (0.6 m) diameter fiberglass media vessels which contain 10 cubic feet of Dow Chemical Company's ADSORBSIA™ GTO™ media and treat 50 gpm (11.35 m3/h) of process water.

Results

Evoqua relationship with the leading manufacturers of ion exchange medias allows an unbiased selection of the best media for the process. We determine which media will provide the customer with the advantages of cost value versus operating results.

Use of the ADSORBSIA™ GTO™ media allowed a lower Empty Bed Contact Time (EBCT) by comparison with other tested medias, which translated to smaller diameter vessel requirement and cost savings for the customer.

Evoqua Water Technologies also assisted this customer in the water permit application process to the State DEQ.