In Situ Volatilization (ISV) Remedical System Cost Analysis.
Technical rept. Jun-Aug 87,
WESTON (ROY F) INC WEST CHESTER PA
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In Situ Volatilization ISV is an emerging technology for soil treatment. It is primarily applicable to treatment of Volatile Organic Compound contaminated soils. The ISV system removes VOCs from the soil by mechanically drawing air through the soil pore spaces. VOCs volatilize into the air as the air moves through the soil. The VOC laden air is then collected and discharged or treated, depending on the amount and types of contaminants present. This is accomplished by installing an array of vents in the contaminated portion of the unsaturated vadose zone. The vents are manifolded to air blowers vacuum pumps, creating a negative pressure in the system and drawing air from the soil. Each vent is valved and can be adjusted to the desired flow rate. Using these valves an ISV system has the flexibility to withdraw air from the most contaminated areas, maximizing the mass removal rate, or operating at a lower mass emission rate as required by the emissions treatment system. VOCs are released from the soil matrix into the air being drawn through the vents and through the vacuum pump.
- Civil Engineering