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Energy Specialties International (ESI)
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  5. ESI - Model IGF - Quadair Induced Gas ...

ESI - Model IGF -Quadair Induced Gas Flotation Unit

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The ESI Quadair Induced Gas Flotation Unit is designed and engineered to remove oil emulsions, suspended solids and organic materials from wastewater. The Quadair requires minimal operating power, uses less floor space and has low installation and maintenance costs. Standard Quadair units are available (see sizing table) & ESI can design special models to meet specific needs. The ESI Quadair Induced Gas Flotation Unit is designed and engineered to remove oil emulsions, suspended solids and organic materials from wastewater.

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The Quadair IGF is designed to break emulsions by means of flotation and purifies wastewater using a multi-compartment system that conserves space and keeps costs down.

  • Cylindrical Configuration Four Cells
  • Over and under Welded Internal Baffles
  • Single, Dual or Multiple Eductors per Cell with Needle Valve
  • Dual Reject Troughs with Three Skimming Options
  • Inlet and Effluent Sample Points
  • Internal and External Painting System
  • Dual Recirculation Pumps with Associated Valves and Piping
  • Controlled and Instrumented per Specifications
The ESI Quadair IGF is divided into six compartments, an inlet distribution compartment (1), four flotation compartments (or cells) (2), (3), (4), (5) and a clean water outlet compartment (6). Each compartment is separated by a pair of over/under baffle plates (7) which prevent short circuiting.

A centrifugal pump (8) recirculates the clean water through a header to an eductor (9) in each flotation cell. Recirculation rate is 50%-125% of the total throughput. The ESI’s Quadair IGF can be equipped with one (1) recirculation pump or with an additional standby pump.

A gas blanket (10) (1-2 oz/sq2) is maintained above the water level to help saturate the liquid. As the recycled water passes through the venturi-type eductor, it creates a slight vacuum pulling gas into the eductor nozzle. Gas flows through a ½” line into a stainless needle valve controlling the amount of gas entering the flotation cell. By controlling the gas induced, the proper bubble size and pattern for efficient lifting of suspended solids and oils is achieved.

Oil and suspended solids create a froth on the liquid surface where they are continuously removed by means of adjustable v-notch weirs, rotating wiper blades or rotating pipe skimmers. The average skim rate ranges from 1-3% of the total liquid throughput and the residence time is approximately 5 minutes. All Quadair IGF`s meet API`s RP 14C and can usually achieve 90-97% efficiency due to the combined features of the baffle configuration, recirculation rate, eductor design and gas volume adjustment.