The galvanizing facility at Emerald Galvanizing, Inc. consists of approximately 8,700 square feet of paved area with an approximately 4,300 square foot building. The stormwater collects at one catch basin and discharges directly into Lake Union Ship Canal which flows into the Puget Sound. The galvanizing site had been struggling to meet the action level benchmarks set in place for zinc by the facility’s Washington Industrial Stormwater General Permit. Though similar to other galvanizers, the zinc benchmark was the most difficult to achieve. Eager to find a solution that would get their stormwater to the benchmarks, Emerald Galvanizing sought the assistance of StormwateRx LLC.
StormwateRx assisted the facility with a design to divert the building roof runoff to a reuse tank for use as process water. The rest of the site sheet fl ows to one central catch basin. Here the stormwater is pumped to an above ground StormwateRx Aquip® 50SBE with Purus™ Metals Polishing option. In this application, the Aquip delivers fi ltered water to the Purus polishing system.
The Aquip 50SBE at Emerald Galvanizing uses a combination of buffering, inert, and sorptive media for the removal of suspended solids and heavy metals. It then pumps to the Purus system for enhanced dissolved metals removal.
From the data collected, the results meet and exceed the stated goal to get the site runoff below benchmark levels. Since installation of Purus the site was inspected by the Department of Ecology and found to be in compliance in all areas inspected, including benchmarks.
Contact StormwateRx to find out how the Purus can help you meet your stormwater quality requirements.