Stormwater Management, Inc.

DownSpout StormFilter™ filter systems help galvanizing facility cut zinc by 87 percent

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Courtesy of Stormwater Management, Inc.

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Since 1967, San Diego Galvanizing has been hot-dipping structural steel, pipe and railings in zinc . Product applications include commercial and residential uses ranging from shipyards, bridges and highways, to residential utilities.

The galvanizing process requires dipping parts into a galvanizing kettle that holds 110 tons of molten zinc. A fan draws about 80 percent of the zinc chloride and ammonium chloride fumes coming off the galvanizing bath into a 3-foot diameter duct inlet where most of the zinc is removed by a wet scrubber. Some fugitive emissions containing zinc escape onto the roof where they settle, or are swept out of the air in stormwater runoff.

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