Aerating apparatus for expelling volatile impurities from ground water

Claim 1

An aerating apparatus for expelling volatile impurities from ground water standing under a ground water pressure and from ground through which said ground water flows comprising: an aeration shaft in said ground; a vacuum generator mounted above said aeration shaft to generate a partial vacuum in said aeration shaft in the vicinity of said ground water to be purified; a container including a pressurized receiving chamber mounted on an upper end of said aeration shaft, said vacuum generator forming said partial vacuum being located in said pressure receiving chamber; means for feeding fresh air into said ground water collected in said aeration shaft below a water level of said ground water in said aeration shaft, wherein said means for feeding said fresh air comprises an air receiving space bounded by a screen wall located in said ground water and an air duct connecting said air receiving space with said pressurized receiving chamber and a float valve in said air duct leading to said air receiving space; said fresh air being conductible to said pressurized receiving chamber at a fresh air pressure balancing said ground water pressure so that said volatile impurities expelled from said ground water in said aeration shaft are forced through said vacuum generator and out a second exhaust opening with accompanying air.