The Problem
Under the direction of Burns & McDonnell, a nationally known engineering/consulting firm, the city of Willmar, MN conducted a pilot study to determine whether an engineered packed tower could successfully remove 1.96 ppm concentrations of iron from potable water.
Why LANPAC® Was Chosen
According to Willmar’s Superintendent of Water Supply, Bart Murphy, results from their three-month feasibility study proved that iron could be removed effectively and economically utilizing a vertical tower packed with 2.3″ LANPAC®.
Meeting the Requirements
In the burns & McDonnell system, a filtration unit downstream collected the iron oxide that precipitated out of the well water.
LANPAC® successfully reduced iron concentrations to 0.04 ppm without plugging during the entire 90-day test.
Based on initial encouraging results, according to Willmar’s Bart Murphy, four ten-foot diameter packed columns using LANPAC® will be installed to treat a total water flow of 5,000 gpm.
LANPAC® features plugging-resistant engineering. Its patented geometry distributes liquid more evenly and completely than other packings.
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WILLMAR PILOT PACKED COLUMNTEST SPECIFICATIONS:
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| Column Diameter | 18 inches |
| Water Flow | 20 gpm |
| Water Temp. | 48° F |
| Air Flow | 100 cfm |
| Packing Height | 10 feet |
| Iron Content (Inlet) | 1.96 ppm |
| Iron Content (Outlet) | 0.04 ppm |
