Groundwater remediation at Le Sodole called for a fast reduction of free product with as little water collected as possible. Single-use polypropylene (PP) membranes take up a lot of water, produce absorbent waste and need frequent replacement. Bailers are less selective when the free-product layer is thin, bring up more water to manage and take more labor.
The oil-soaked sock (1) is wrung by hand (2) and the recovered product collects in the funnel (3).
The oil-soaked sock (1) is wrung by hand (2) and the recovered product collects in the funnel (3).
A reusable FoamFlex sock picked up the floating product, and a wringing unit returned the oil to a container so the sock could go back in.
A FoamFlex absorbent sock, held in a protective cage, was lowered into the piezometer until it touched the floating product.
The sock was pulled out and wrung in the wringing unit, and the recovered product, mainly oil, ran into a container.
The same sock went back into the well for further passes until the free product was gone, and was then reused.
PZ27, with less than 8 cm of free product: 100% removed in 3 passes of 3 minutes each, about 9 minutes. PZ32, with less than 2 cm: 100% removed in 2 passes of 3 minutes each, about 6 minutes.
PZ30, with more than 50 cm: 48% reduction, even though the well recharged quickly and continuously. The method worked with both thick and very thin layers of free product.
A single sock was wrung up to 15 times at PZ30, and solid and liquid waste generation was strongly reduced. In laboratory tests against PP membranes and bailers, FoamFlex took up about 2 times more net oil than PP (7.0 against 3.5 g/g, water excluded), about 87% less water (5.8 ml against 43.6 ml after immersion), needed about 73% less labor than the bailer and produced about 98.6% less solid waste than PP.
FoamFlex absorbent sock in a protective cage and the T1 manual wringing unit.
Compact and safe wringer for FoamFlex membranes in piezometers: extended reuse and clean liquid handling.
Stainless steel cage in three sizes for the secure housing of FoamFlex membranes in 2'', 3'' and 4'' piezometers.
FoamFlex absorbent membrane for piezometers, available in three sizes: oil-selective, effective, and reusable.
A FoamFlex absorbent sock in a cage is lowered into the piezometer, takes up the floating hydrocarbons selectively and is then wrung in a wringing unit. The recovered product was mainly oil, with very little water.
Yes. At PZ32, with less than 2 cm of free product, 100% was removed in 2 passes of 3 minutes each. It also worked with less than 8 cm at PZ27 and, with a 48% reduction, at more than 50 cm with fast recharge at PZ30.
Yes. A single sock was wrung up to 15 times in the field at PZ30. Each wringing returns the recovered product to a container and the sock goes back into the well, which means less disposable absorbent waste than with single-use PP membranes.
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