Ground water remediation

Hilliard Emission Controls, Inc.
3100 Edloe Street Suite 350
Houston, TX 77027
888-621-3132

Soil remediation units

If solvents are spilled into soil, it is sometimes possible to remediate the earth. This is done by drilling a number of shallow wells (10' to 15' deep) in the affected area and then keeping those wells evacuated. An engineer should direct the well installation and placement because correct well placement requires a study of the area hydrology.

Once the shallow wells are placed, a vacuum skid can keep the wells evacuated. The purpose of the skid is to separate the gas and the liquid. The gases may be sent to a flare or other vapor control device and the liquid is usually sent to a treatment station. The recovered solvents may be separated from water and both streams processed apropriately. Sometimes, actually, most of the time it is not easy to separate the water and solvent. They seem to come up as an emulsion, requiring biological waste treatment.

PURGIT built and installed 2 separators and a ground flare in July 2003 at a Houston, TX facility. These separators are for a soil remediation project. The blowers on the separator skids move about 150 scfm of gas and 60 gpm of liquid from shallow wells. The nature of the recovered ground water and solvent has changed over the months the units have been on line. In the beginning there was a high percentage of solvent and littler water, and now there is a high percentage of water and very little solvent. The exhaust gas from the separators is enriched with propane and burned in a gas flare.

We can build and install these units.

One of the 2 gas separators	Another view of the installation
Second installation	Drawing of the separator tank

This blower creates a vacuum to keep the shallow wells

evacuated and move vapors and liquids to the separator

Shallow well with separator in the background

Flare, water trap, shallow well

Flare / pilot control station with flare and water separator in the background.