QED Environmental Systems, Inc

- Model LNAPL Skimmers - Bladder Pump w/Internal Cycle Control



Genie skimmers are safe, reliable and complete systems for removing floating LNAPL layers from wells. The SPG and SOS AutoGenie Genie skimmers are air-operated selective LNAPL removal systems with a high suction pump and a floating inlet designed to follow the LNAPL layer as the ground water level fluctuates. The SPG version uses a specific gravity float and the SOS version uses a hydrophobic screen to exclude water. All Genie skimmer systems pump the LNAPL using a special bladder pump with high suction capability, positioned above the floating inlet section of the system.

The use of a bladder pump eliminates air contact with the LNAPL fluids, minimizing emulsification and eliminating VOC emissions. The AutoGenie uses an integral pneumatic timer to control the pump fill and discharge times. A complete line of matched accessories is available to help with installation and performance, including in-well tubing, well caps, ON/OFF timers, LNAPL collection tank full shutoffs and other items.

  • Specialized bladder pump is extremely durable, provides high suction to maintain flow and eliminate contact of drive air with pumped fluid.
  • Choice of two types of selective floating inlets.
  • Continuous Automatic cycling.
  • Available in several different lengths and diameters to accommodate specific well conditions.
  • Low air consumption.

The LNAPL enters the skimmer system through the floating inlet, flows down through a flexible tube, then is pulled upward by the pump’s suction action during the fill cycle. 

During the discharge cycle, the bladder is squeezed by the compressed air and the LNAPL is pumped to the collection system at the ground surface. Then, during the fill cycle the compressed air around the bladder is exhausted again and the bladder expands, resuming its original shape. This pulls fluid into the bladder through the check valve at the bottom of the pump.

SPG Inlet
AutoGenie SPG Inlet

The SPG (specific gravity) inlet uses a float with a controlled specific gravity that causes it to float on water but not in the LNAPL. The SPG float has its fluid inlet port positioned near the top so that it is always above water. If the LNAPL layer gets too thin, the SPG inlet will also be above the LNAPL layer and cease recovery of hydrocarbons until more enters the well. To accommodate a range of final LNAPL layer thickness, the SPG float has multiple, variable inlet ports that can be opened or plugged to adjust the level of the inlet port. Why isn’t the SPG always set for the thinnest possible LNAPL layer? The reason is that any float in a small diameter well has a tendency to occasionally stick as liquid levels move up and down, so setting the inlet port too low increases the chance of allowing water to be pumped instead of pumping only LNAPL. So, a trade-off must be made between achieving desired final LNAPL layer thickness and prevention of pumping water.

SOS Inlet

AutoGenie SOS Inlet

The SOS inlet uses a float with an inlet port inside a hydrophobic, or water-rejecting, screen. The hydrophobic screen prevents water from being taken in and pumped to the surface, even if the float occasionally sticks or drags as the liquid level fluctuates. While this is a distinct advantage of the SOS inlet over the SPG type, the SOS inlet screen is more subject to plugging due to potential debris or slimes present in the well. The SOS inlet works best on fresh gasoline and jet fuel spills, and less so on weathered diesel.

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