Apparatus for passive removal of subsurface contaminants

Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization

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Details

405131, 405258, 166266, 166370, 166372, 588249, B09B 300

Patent

active

056412452

ABSTRACT:
An apparatus is provided which passively removes contaminated gases from a subsurface. The apparatus includes a riser pipe extending into a subsurface which has an exterior end in fluid communication with a valve. When well pressure is greater than atmospheric pressure, the valve opens to release contaminants into the atmosphere, and when well pressure is less than atmospheric pressure, the valve closes to prevent flow of air into the well. The valve assembly of the invention comprises a lightweight ball which is lifted from its valve seat with a slight pressure drop between the well and the atmosphere.

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