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Radio Frequency Heating for Soil Remediation.

Stephen L Price¹, Raymond S Kasevich¹, Mark A Johnson²

¹a KAI Technologies, Inc. , Portsmouth , New Hampshire , USA.

Journal of the Air & Waste Management Association (1995)

|January 14, 2017

Summary

Radio frequency heating (RFH) significantly boosts site remediation efficiency. This technology accelerates contaminant removal by heating soil, enhancing soil vapor extraction performance by up to 50%.

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Area of Science:

Environmental Engineering
Geotechnical Engineering
Chemical Engineering

Background:

Site remediation technologies often face challenges with slow contaminant removal rates.
Heating subsurface materials can alter contaminant, soil, and groundwater properties, improving remediation.
Radio frequency heating (RFH) offers a method for controlled subsurface heating to enhance remediation.

Purpose of the Study:

To evaluate the effectiveness of RFH in accelerating contaminant removal.
To demonstrate the synergistic effect of RFH with Soil Vapor Extraction (SVE).
To assess RFH performance in both laboratory and field settings.

Main Methods:

Bench-scale study using PCE-contaminated soil heated to 90°C.
Field demonstration at a former gasoline station using an integrated RFH/SVE system.
Monitoring soil temperature changes and contaminant reduction over time.

Main Results:

RFH increased PCE removal rate by a factor of 8 in bench-scale tests.
Field application raised soil temperature from 8°C to 100°C near the applicator.
Integrated RFH/SVE system achieved a 50% reduction in gasoline range organics (GRO) within 2-3 months.

Conclusions:

RFH is a cost-effective technology for enhancing site remediation.
RFH significantly accelerates contaminant removal, particularly when integrated with SVE.
RFH shows promise for improving bioremediation and product recovery processes.