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Air stripping for water decontamination

| By Chemical Engineering

QED Environmental Systems

QED Environmental Systems

The E-Z Tray air stripper (photo) is a sliding-tray, stainless-steel air stripper used for removing volatile organic compounds (VOCs) from contaminated groundwater and waste streams. E-Z Tray’s design achieves high removal efficiencies in an easy-to-maintain process unit that is readily accessible for process monitoring and inspection, even while in operation. The stripper is not prone to fouling and can be cleaned by one person with a simple pressure wash. It also offers a wide turndown range. As contaminated groundwater enters through the top of the E-Z Tray air stripper, millions of air bubbles are forced by blower pressure up through the perforated trays. This creates a turbulent froth zone with an extremely high air-to-liquid surface area for mass transfer of VOCs from liquid to air. Using the froth instead of a conventional tower packing delivers high VOC-removal efficiencies, even under fouling conditions. — QED Environmental Systems, Ann Arbor, Mich.