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Environmental Technology Listing
Title of Listing:
Hrubout (TM) - In-Situ
Category:
Treatment Technologies
Subcategory:
 *Soil, All Listings
Media:
Soil
Contaminants:
VOCs and SVOCs
Web Site:
Email:
psww68c@prodigy.com
Technology Description:

THERMALLY ENHANCED RECOVERY - IN SITU
          The HRUBOUT (TM) process (U.S. Patent No. 5,011,329) is a mobile thermal treatment batch process that removes volatile and semivolatile organic compounds from contaminated soils. In the in situ process, heated air is injected into the soil below the zone of contamination, evaporating the soil moisture and removing the VOCs and SVOCs. Once the water is evaporated, the soil porosity and permeability is increased, allowing for increases in pressure and temperature. Low-volatility hydrocarbons can then be removed by slow oxidation at higher temperatures.

          HRUBOUT (TM) is available in three embodiments: in situ, ex situ and a containerized version. In the in situ method, injection wells are drilled in pre-determined distribution patterns to a depth below the contaminated zone. The wells are equipped with steel casing, perforated at the base and cemented in the hole. Heated, compressed air is introduced at temperatures up to 1,200 degrees Fahrenheit and pressure is slowly increased. As the vapors reach the surface, which is covered with an impermeable cover, a vacuum directs the vent gases to an oxidizer, where they are destroyed at 1,500 degrees Fahrenheit with a 0.6-second retention time. Large areas can be remediated sequentially until the entire area has been treated. It eliminates the need to excavate, transport, and landfill soils. There is no residual waste.

          Hrubetz also offers a similar technology for ex situ applications. This technology is listed under Thermal Desorption.

          The ex situ soil pile process involves a horizontal piping grid overlain with a mound of soil and remediates approximately 1,100 cubic yards per batch. The mound is covered with an impermeable membrane and is treated in the same manner with heated, compressed air.

          The containerized method remediates approximately 25 cubic yards per batch and is processed similarly, except that the soil is enclosed in an insulated container. It is especially adaptable for use at refineries or processing plants that yield daily quantities of contaminated soils or sludges as a by product.

          The HRUBOUT (TM) process is capable of treating a broad variety of organic halogenated or nonhalogenated volatiles, as well as semivolatiles, at any concentration range, which includes but is not limited to solvents, gasoline, jet fuel, diesel, crude oil, lube oils, and creosotes. The technology allows for application to all types of soils from sand to clay.

          The equipment is very versatile, mobile, and relatively compact. The unit requires electricity which can be supplied by either a generator or a three-phase power hook-up to an existing power source. The burner and oxidizer are fueled by either natural gas or propane. The units can operate twenty-four hours a day, are completely weatherproofed, and require minimal manpower. VOC destruction rate is a minimum of 99.5 percent.
Performance Status/
Limitations:

Performance Status:

          Early research and development led to the development of the first prototype commercial unit in August, 1990. The unit was subjected to nearly three months of continuous operation at a test site. Results confirmed bench tests which indicated that soil could be heated to temperatures that would volatilize -- and in the case of the more inert hydrocarbons, oxidize -- common hydrocarbon-derived contaminants. Field tests of various injection methods and operating techniques have continued to the present date.

          On April 30, 1991, U. S. Patent No. 5,011,329 was issued covering the in situ process. Subsequent U.S. Patent numbers 5,251,700, 5,261,765 and 5,325,795 covers the soil pile and container processes.

          The process was approved by the Texas Water Commission in December, 1991. For nonhazardous wastes in Texas, only a Standard Exemption 68 is required from the Texas Air Control Board for air emissions.

          Limitations:

          A shallow water table inhibits the in situ process for soil remediation. In this instance, sparging treatment would be employed, or the water table would be lowered by pumping.
Topics
Technologies, Treatment/Remediation
Additional Topics/Tags/Keywords
Thermal Treatment, In-Situ, Soil

Organization:
HRUBETZ ENVIRONMENTAL SERVICES, INC.
Address:
5949 Sherry Lane
Suite 525
Phone:
DescriptionNumber
City:
Dallas
1.
Primary (214) 363-7833
State/Province/Territory:
TX
2.
Zip/Postal Code:
75225
3.
Country:
United States
4.
Fax:(214) 691-8545
Branch Locations: