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Title: Method for phosphate-accelerated bioremediation

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 fluid 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. 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.
Inventors:
 [1];  [2];  [2];  [3];  [3];  [4]
  1. (Aiken, SC)
  2. (Augusta, GA)
  3. (Knoxville, TN)
  4. (Seattle, WA)
Issue Date:
OSTI Identifier:
870230
Assignee:
United States of America as represented by United States (Washington, DC) SRS
Patent Number(s):
US 5480549
Contract Number:
AC09-89SR18035
Research Org:
WESTINGHOUSE SAVANNAH RIVER CO
Country of Publication:
United States
Language:
English
Subject:
method; phosphate-accelerated; bioremediation; apparatus; supplying; vapor-phase; nutrient; contaminated; soil; situ; housing; adapted; containing; quantity; liquid; conduit; fluid; communication; interior; means; causing; gas; flow; contacting; portion; evaporates; mixes; mixture; vapor; delivered; site; via; injection; extraction; configured; partial; pressure; vaporized; desired; heated; increase; concentration; preferably; volatile; substantially; nontoxic; nonflammable; organic; phosphate; environmental; temperatures; triethyl; tributyl; housing adapted; contaminated soil; tributyl phosphate; vapor pressure; fluid communication; partial pressure; organic phosphate; situ bioremediation; contaminated site; vapor-phase nutrient; environmental temperature; phosphate-accelerated bioremediation; liquid nutrient; /210/166/405/

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