Soil and groundwater remediation system

• US 4,846,934 A
• Filed: 09/19/1988
• Issued: 07/11/1989
• Est. Priority Date: 09/19/1988
• Status: Expired due to Term

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Carberry, Terrance K.
• Primary Examiner(s): Fisher, Richard V.
• Assistant Examiner(s): Nessler, Cynthia L.
• Application Number:
  US07/246,057
• Time in Patent Office: 295 Days
• Field of Search: 203/87, 203/39, 203/41, 203/95, 203/96, 203/11, 203/22, 203/23, 202/200, 202/186, 202/234, 202/202, 202/204, 202/205, 55/179, 210/747, 210/170, 210/177, 210/181, 210/182, 210/195.1
• US Class Current: 202/177
• CPC Class Codes: B01D 5/0036 Multiple-effect condensation; Fractional condensation
• CPC Class Codes: B01D 5/0045 Vacuum condensation
• CPC Class Codes: B09C 1/005 Extraction of vapours or gases using vacuum or venting
• CPC Class Codes: B09C 2101/00 In situ

Abstract

The invention is a system for removing volatile hydrocarbon contaminates from both water and moisture-ladened air. In detail the invention comprises a steam stripping system for mixing the contaminated water with steam, at below atmospheric pressure, providing clean water for reuse and contaminated steam and vaporized hydrocarbon contaminates. A first condenser receives the contaminated steam and vaporized hydrocarbon contaminates and condenses, at below atmospheric pressure, a portion of the vaporized contaminates and a portion of the contaminated steam into contaminate water. A second condenser thereafter further condenses the steam and hydrocarbon vapor. A gravity separator thereafter receives the contaminated water from the first and second condensers and the uncondensed steam and hydrocarbon contaminates from the second condensor and provides outputs comprising: separated contaminated water for recycling; condensed hydrocarbon contaminates for reprocessing; and passes the uncondensed hydrocarbon contaminates to activated charcoal absorbers. The contaminated moisture-ladened gas is passed through a third condenser which produces contaminated water which is recycled to the steam stripping system and the remaining uncondensed hydrocarbons are passed through the activated charcoal absorbers.

Claims

1. A system for simultaneously removing hydrocarbon contaminates from water and moisture-ladened air comprising:

steam stripping means for stripping the hydrocarbon contaminates from the contaminated water providing heated clean water and a first mixture of hydrocarbon contaminated steam and vaporized hydrocarbon contaminates;

first condenser means for receiving the first mixture and condensing a portion thereof providing a second mixture of contaminated water and condensed hydrocarbon contaminates and the remaining portion of the first mixture comprising hydrocarbon contaminated stream and vaporized hydrocarbon contaminates;

a second condenser means for receiving the remaining portion of the first mixture and condensing a second portion thereof providing condensed contaminated water and condensed hydrocarbon contaminates and a remaining portion of the first mixture substantially comprising uncondensed hydrocarbon contaminates;

gravity separator means for receiving the contaminated water and condensed hydrocarbon contaminates from said first and second condenser means and the uncondensed hydrocarbon contaminates and providing separated condensed contaminated water, condensed hydrocarbon contaminates and uncondensed hydrocarbon contaminates;

third condenser means for receiving hydrocarbon contaminated moisture-ladened air providing contaminated water and uncondensed hydrocarbon contaminates; and

absorber means for receiving and absorbing the uncondensed hydrocarbon contaminates from said third condenser means and said gravity separator means.

2. The system as set forth in claim 1 including vacuum pump means, downstream from said first condenser means, for reducing the pressure within said steam stripping means and said first condenser means to below atmospheric pressure.

3. The system as set forth in claim 2 including:

said steam stripping means including an incoming contaminated water line and an outgoing clean-water line; and

a heat exchanger means connected to said incoming line upstream of said steam stripping means and coupled to said outgoing clean-water line for heating the incoming contaminated water by means of the heated clean water.

4. The system as set forth in claim 3 wherein said first condenser means is coupled to said incoming line upstream of said heat exchanger means for receiving and returning incoming contaminated water and using same to cool the first mixture.

5. The system as set forth in claim 4 wherein said second condenser means is coupled to said outgoing clean-water line after said heat exchanger means and before said heat exchanger means for receiving and returning clean water, respectively, thereto and using same to cool the remaining portion of the first mixture.

6. The system as set forth in claim 5 further comprising a return means coupled to said gravity separator and said third condenser means and said incoming contaminated water line upstream of said eat exchanger means for returning the contaminated water produced by said gravity separator means and said third condenser means to said incoming contaminated water line.

7. The system as set forth in claim 3 wherein a pump is coupled to said outgoing clean water line between said steam stripping means and said heat exchanger means for pumping the clean water through said heat exchanger means.

8. The system as set forth in claim 6 wherein said return means comprises:

a tank for storing condensed hydrocarbon contaminates;

first and second lines coupling said gravity separator means and said third condenser, respectively, to said tank for transferring condensed hydrocarbon contaminates to said tank;

first and second pumps mounted in said first and second lines, respectively, for pumping the condensed hydrocarbon contaminates to said tank;

a third line coupling said tank to said incoming contaminated water line; and

a third pump mounted in said third line for pumping the condensed hydrocarbon contaminates from said tank to said incoming contaminated water line.

9. The system as set forth in claim 8 wherein said absorber means comprising:

at least two absorber beds;

means to back flush the at least two absorber beds with steam for back flushing absorbed hydrocarbons to said second heat exchanger means; and

coupling means for alternately coupling one absorber bed to said means to back flush and said second absorber bed in operation for receiving the uncondensed hydrocarbon contaminates from said third condenser means and said gravity separator means.