Liquid purification or separation – Automatic control – Thermal
Patent
1995-12-28
1998-05-19
Wyse, Thomas G.
Liquid purification or separation
Automatic control
Thermal
210170, 210251, 166 68, 405128, C02F 334, E21B 4322
Patent
active
057531099
ABSTRACT:
An apparatus and method for supplying a vapor-phase nutrient to contaminated soil for in situ bioremediation. The apparatus includes a housing adapted for containing a quantity of the liquid nutrient, a conduit in communication with the interior of the housing, means for causing a gas to flow through the conduit, and means for contacting the gas with the liquid so that a portion thereof evaporates and mixes with the gas. The mixture of gas and nutrient vapor is delivered to the contaminated site via a system of injection and extraction wells configured to the site and provides for the use of a passive delivery system. The mixture has a partial pressure of vaporized nutrient that is no greater than the vapor pressure of the liquid. If desired, the nutrient and/or the gas may be heated to increase the vapor pressure and the nutrient concentration of the mixture. Preferably, the nutrient is a volatile, substantially nontoxic and nonflammable organic phosphate that is a liquid at environmental temperatures, such as triethyl phosphate or tributyl phosphate.
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Borthen James W.
Hazen Terry C.
Lombard Kenneth H.
Looney Brian B.
Pfiffner Susan M.
Dixon Harold M.
Gottlieb Paul A.
Moser William R.
The United States of America as represented by the United States
Wyse Thomas G.
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