Refrigerated Condensation for SVE and Off-Gas Treatment

Sustainable Remediation!
Recover, Reuse or Recycle through condensation of VOCs in off-gas streams.

Introducing 'C3' Technology from:
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The C3 Technology developed by G.E.O. is a combination of cryogenic-cooling and compression
processes with a proprietary regenerative adsorption technology that efficiently recovers volatile organic compounds (VOCs) from the off-gas vapour stream of soil vapour extraction (SVE) or dual phase
extraction (DPE) systems. The chemical is recovered as a non-aqueous phase liquid (NAPL) that is
temporarily containerized in appropriate vessels for recycling, reuse or proper disposal. Generally, greater
than 99.8% of the VOCs are recovered from the vapour stream. Dependent upon local regulations, final
off-gas effluent may need to be polished with granular activated carbon (GAC).

Process Flow- Soil Vapour Extraction & 'C3' Off-Gas Treatment

Process Description

Contaminated vapour is extracted from the soil by a vacuum blower and delivered to the air compressor

Entrained liquids from extraction wells are separated at the water knockout tank. Separated liquids are securely drummed and transported off-site or treated with GAC before discharged to sewer or stormwater in accordance with all regulatory requirements.

Process air is compressed to approximately 150 pound per square inch (psi) by the compressor.

Water vapour is removed from the process stream at the air-to-air heat exchangers as it is cooled to ambient temperature.

The vapour stream is further cooled to approximately -40° C in the refrigerated heat exchangers, where the chemical constituents (VOC's) are condensed and separated from the vapour stream.

The vapour stream is then passed through a regenerative adsorber, which removes any fugitive VOCs and directs it back to the inlet stream.

System effluent vapour stream typically with VOC concentration of less than <10 parts per million by volume (ppmv) is finally polished through granular activated carbon (GAC) prior to discharge to atmosphere.

System Capacities and Power Requirements

GEO currently manufactures standard systems of 100, 200, 300, and 500 SCFM capacity.

Flow Rate	100 SCFM	200 SCFM	300 SCFM	500 SCFM
Power Requirements	415 VAC 3-phase 100Amp and 240 VAC 70 AMP	415 VAC 3-phase 200Amp and 240 VAC 70 AMP	415 VAC 3-phase 300Amp and 240 VAC 70 AMP	415 VAC 3-phase 400Amp and 240 VAC 70 AMP
Power Usage	45 KVA	75KVA	105KVA	170KVA
Carbon (GAC) Polish	Two 200 Ltr Drums	Two 200Kg Drums	Two 200Kg Drums	Two 500Kg Drums

For larger air flow requirements, G.E.O. provides custom systems of up to 1,000 SCFM or can combine C3 Technology with zeolite rotary concentrator wheels for dilute streams up to 7,000 SCFM depending on compound of concern.