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! IIIfI IIItIIII I I[III IN] oil 11111111111111111 IN <br />US005605634A <br />United States Patent [19] [I1) Patent Number: 5,6059634 <br />Wilson et al. [45] Date of Patent: Feb. 25, 1997 <br />[54] <br />TREATMENT OF CONTAMINATED <br />4,401.569 811983 lhaveri et al........................... 210/747 <br />GROUNDWATER <br />4,478,765 10/1984 Tubbs .. .. ..........._._... 2I0/170 <br />4,755,304 711988 Hallberg et al . ........... ....,...... 2100147 <br />[75) <br />Inventors: Ryan D. Wilson. Kitchener, Canada; <br />5,006,250 411991 Roberts et at .......................... 2100747 <br />Douglas M. Mackay, Stanford, Calif. <br />5,171,104 12!1992 Bemhardt................................ 2101170 <br />5,302,286 411994 Semprini el al ........................ 2101170 <br />[73) <br />Assignee: University of Waterloo, Canada <br />5,384,048 1/1995 Hazen et al ............................. 2101747 <br />5,456,550 10/1995 Devlin ..................................... 4051128 <br />[21] <br />Appl. No,: 426,966 <br />Primary .Examiner—Chriistopher Upton <br />[22] <br />Filed: Apr. 24, 1995 _ <br />Altomey, Agent, or Firm—Anthony Asquith & Co. <br />[30] <br />Foreign Application Priority Data <br />[57) ABSTRACT <br />Apr. 23, 1994 [GB] United Kingdom ................... 9408125 <br />The system places traces of nutrients and other treatment <br />[51 ] <br />Int, C1.6 ........................................................ CO2F 1/00 <br />substances in the ground, in the path of an on -coming plume <br />[52] <br />U.S. Cl. .......................... 210(147; 2I0/170; 210/220; <br />of contaminated groundwater. Boreholes placed across the <br />435/52; 435/128; 1660305.1 <br />plume contain respective diffusion tubes, the tubes being of <br />[58] <br />Feld of Search .............. _....... .............. 210/610,7.47, <br />a.g LDPE, or dialysis tubing. The remediation substance is <br />21 CV749, 170, 194, 195.2, 220; 435152, <br />circulated (pumped) through the diffusion tubes periodically. <br />128; 166/305.1 <br />The remediation substance diffuses through the LDPE into <br />the water in the borehole, and thence into the plume and is <br />[56] <br />References Cited <br />carried into the aquifer. <br />U.S. PATENT DOCUMENTS <br />3,846,290 [1/1974 Raymond ................................ 2101610 <br />11 Claims, 3 Drawing Sheets <br />MAKE-UP <br />RESERVOIR <br />STOCK 47 50 <br />TANK <br />SAMPLE <br />- 45 42 POINT <br />- 27 ' <br />25 38 .......... <br />20 "V29 <br />