초록 ▼

The system places traces of nutrients and other treatment substances in the ground, in the path of an on-coming plume of contaminated groundwater. Boreholes placed across the plume contain respective diffusion tubes, the tubes being of e.g LDPE, or dialysis tubing. The remediation substance is circu

The system places traces of nutrients and other treatment substances in the ground, in the path of an on-coming plume of contaminated groundwater. Boreholes placed across the plume contain respective diffusion tubes, the tubes being of e.g LDPE, or dialysis tubing. The remediation substance is circulated (pumped) through the diffusion tubes periodically. The remediation substance diffuses through the LDPE into the water in the borehole, and thence into the plume and is carried into the aquifer.

대표청구항 ▼

Procedure for placing small quantities of a substance into groundwater moving through an aquifer, comprising the steps of; in a borehole in the material of the aquifer, placing a diffusion tube down from the ground surface into the depth of the borehole; the borehole being of the kind into which gro

Procedure for placing small quantities of a substance into groundwater moving through an aquifer, comprising the steps of; in a borehole in the material of the aquifer, placing a diffusion tube down from the ground surface into the depth of the borehole; the borehole being of the kind into which groundwater can enter from the aquifer, can pass through, and can re-enter the aquifer, laterally; providing a source of the substance in fluid form; the diffusion tube is made of a material of the kind through which the fluid substance is capable of diffusing molecularly; placing the diffusion tube in the borehole, whereby the diffusion tube is located in the groundwater in the borehole; the diffusion tube having an entry end and an exit end, and forming means for passing fluid through the diffusion tube, from the entry end to the exit end thereof; the diffusion tube being substantially imperforate, and being thereby closed to the escape of fluid out of the diffusion tube, other than by molecular diffusion through the material of the tube, between the entry end and the exit end thereof; providing a circulation means, comprising a means for pressurising the fluid substance, and for conducting the fluid substance to the entry end of the diffusion tube, conducting the fluid substance through the diffusion tube from end to end thereof, and for collecting the fluid substance emerging from the exit end of the diffusion tube, and for circulating the fluid substance and returning same to the entry end; and circulating the fluid substance through the diffusion tube.