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Soil vapor extraction (SVE) is a physical treatment process for in situ remediation of volatile contaminants in vadose zone (unsaturated) soils (EPA, 2012). SVE (also referred to as in situ soil venting or vacuum extraction) is based on mass transfer of contaminant from the solid (sorbed) and liquid (aqueous or non-aqueous) phases into the gas phase, with subsequent collection of the gas phase ...
Air sparging is a subsurface contaminant remediation technique that involves the injection of pressurized air into contaminated ground water [1] [10] [11] causing hydrocarbons to change state from dissolved to vapor state. [12] The air is then sent to the vacuum extraction systems to remove the contaminants.
Dual-phase vacuum extraction (DPVE), also known as multi-phase extraction, is a technology that uses a high-vacuum system to remove both contaminated groundwater and soil vapor. In DPVE systems, a high-vacuum extraction well is installed with its screened section in the zone of contaminated soils and groundwater.
In-situ technologies include but are not limited to: solidification and stabilization, soil vapor extraction, permeable reactive barriers, monitored natural attenuation, bioremediation-phytoremediation, chemical oxidation, steam-enhanced extraction and in situ thermal desorption and have been used extensively in the USA. [11]
ET-DSP electrodes are placed into the contaminated zone and are designed so that conventional three-phase power can be used to heat the soil. The distance between electrodes and their location is determined from the heat transfer mechanisms associated with vapor extraction, electrical heating, and fluid movement in the contaminated zone.
A second round of soil vapor extraction from the contaminated site occurred in 2017 after years of planning and setup. [3] A SVE system was used to extract toxic vapor from soil on the site in a $10 million dollar operation. [4] By 2018 all equipment had been removed by the EPA.
According to the MAGS Manual, written by HSA and adopted by the Florida Department of Environmental Protection, MAGS is performed "by utilizing a typical regenerative blower fitted to a temporary soil vapor extraction well, [such that]a large volume of soil can be assessed with a limited number of samples. While lacking the resolution of ...
Volatilized contaminants are captured by a subsurface vapor recovery system and conveyed to the surface along with recovered air and steam. Similar to Soil vapor extraction, the air, steam and volatilized contaminants are then treated at the surface to separate water, air and the contaminants. Treatment of the various streams depends on local ...