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1111111111111111111111111111111 HIM UIIs11I_ 1 16III4A1II�� I1III �I��II I1I 1I�II IN <br />United States Patent [19] [11] Patent Number: 596059634 <br />Wilson et al. [45] Date of Patent: Feb. 25, 1997 <br />[541 TREATMENT OF CONTAMINATED <br />GROUNDWATER <br />[75] Inventors: Ryan D. Wilson, Kitchener, Canada; <br />Douglas M. Mackay, Stanford, Calif. <br />[73] Assignee: University of Waterloo, Canada <br />[21] Appl. No.: 426,966 <br />[22] Filed: Apr. 24, 1995 <br />[30] Foreign Application Priority Data <br />Apr. 23, 1994 [GBJ United Kingdom ................... 9408125 <br />[511 Int. C1.6 ........................................................ CO2F 1/00 <br />[52] U.S. Cl... ........................ 210/747; 210/170; 210/220; <br />435/52; 435/128; 166/305.1 <br />[58] Field of Search .................................... 210/610, 747, <br />210/749, 170, 194, 195.2, 220; 435/52, <br />128; 166/305.1 <br />[56] References Cited <br />U.S. PATENT DOCUMENTS <br />3,846,290 11/1974 Raymond ..................... <br />M <br />27 <br />25 <br />210/610 <br />4,401,569 <br />8/1983 <br />Jhaveri et al ........................... <br />21on47 <br />4,478,765 <br />10/1984 <br />Tubbs ...................................... <br />210/170 <br />4,755,304 <br />7/1988 <br />Hallberg et al ......................... <br />210(747 <br />5,006,250 <br />4/1991 <br />Roberts et al . ......................... <br />210/47 <br />5,171,104 <br />12/1992 <br />Bernhardt ................................ <br />210/170 <br />5,302,286 <br />4/1994 <br />Semprini et al ........................ <br />210/170 <br />5,384,048 <br />1/1995 <br />Hazen et al ............................. <br />21on47 <br />5,456,550 <br />10/1995 <br />Devlin ..................................... <br />405/128 <br />Primary Examiner—Christopher Upton <br />Attorney, Agent, or Firm—Anthony Asquith & Co. <br />[571 ABSTRACT <br />The system places traces of nutrients and other treatment <br />substances in the ground, in the path of an on -coming plume <br />of contaminated groundwater. Boreholes placed across the <br />plume contain respective diffusion tubes, the tubes being of <br />e.g LDPE, or dialysis tubing. The remediation substance is <br />circulated (pumped) through the diffusion tubes periodically. <br />The remediation substance diffuses through the LDPE into <br />the water in the borehole, and thence into the plume and is <br />carried into the aquifer. <br />MAKE-UP <br />RESERVOIR <br />STOCK 47 50 <br />TANK <br />moi_-rc <br />PUMP <br />11 Claims, 3 Drawing Sheets <br />SAMPLE <br />POINT <br />CIRCULATION <br />CONTROL UNIT <br />23 <br />0 <br />