| 摘要 |
A series of horizontally extending drainage pipes forming a grid system are located at or below the level of a plume of liquid contamination. The drainage recovery pipes skim off the surface of the water table, along with the plume of contamination. This minimizes the time required for removal of water that needs to be pumped from the ground and cleaned. Once the contaminant is pumped from the ground, it is delivered to a conventional treatment system where it is cleaned and then the cleaned water is returned back to the ground water table. This cleaned water is reintroduced over the grid system and is drawn through the soil to flush out any remaining contaminants in the soil. Once the treated water reaches the water table, the liquid contaminants are usually less dense than water and rise towards the surface of the water table. The contaminants are then removed by the grid system for treatment.
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