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Remediation Technologies Screening Matrix, Version 4.0 4.20 Solar Detoxification
(Ex Situ Soil Remediation Technology)
  Description Synonyms Applicability Limitations Site Information Points of Contact
Data Needs Performance Cost References Vendor Info. Health & Safety
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Technology>>Soil, Sediment, Bedrock and Sludge

>>3.5 Ex Situ Physical/Chemical Treatment

      >>4.20 Solar Detoxification
Introduction>> Solar detoxification is a process that destroys contaminants by photochemical and thermal reactions using the ultraviolet energy in sunlight.

Description:

Figure 4-20: Typical Solar Detoxification System In this process, vacuum extraction is used to remove contaminants from soils. After condensation, contaminants are mixed with a semiconductor catalyst such (e.g., titanium dioxide), and fed through a reactor which is illuminated by sunlight. Ultraviolet light activates the catalyst, which results in the formation of reactive chemicals known as "radicals". These radicals are powerful oxidizers that break down the contaminants into non-toxic by-products such as carbon dioxide and water.

A big advantage of solar detoxification over conventional treatment processes such as those using granular activated carbon or air stripping is that it completely destroys the toxic compounds in the water instead of simply removing or displacing them. The solar process also has no atmospheric emissions.

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Synonyms:

NA

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Applicability:

The target contaminant group for solar detoxification is VOCs, SVOCs, solvents, pesticides, and dyes. The process may also remove some heavy metals from water.

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Limitations:

Factors that may limit the applicability and effectiveness of solar detoxification include:
  • It can only be effectively used during the daytime with normal intensity of sunlight.
  • Biological fouling or physical fouling with suspended solids or precipitated irons would limit its effectiveness.

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Data Needs:

A detailed discussion of data elements is provided in Subsection 2.2.1 (Data Requirements for Soil, Sediment, and Sludge).

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Performance Data:

DOE has demonstrated the use of solar energy to remediate contaminated soil at pilot scale. The process has been successfully tested by decontaminating ground water at a former naval air facility. A 4-month field test was conducted on the grounds of Lawrence Livermore National Laboratory (LLNL). The ground water contamination there dates back to World War II, when the facility was a naval air base. Trichloroethylene (TCE) and other volatile organic compounds that were used to clean engine parts now contaminate the ground water. The field test was a huge success, proving the detoxification process works. The process brought the contaminants to levels well below the 5 parts per billion (ppb) EPA standard.

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Cost:

NA

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References:

SERDP, 1993. Solar Detoxification of Explosives in Water, Technology Information Profile by EnviroSense and SERDP for DOE. Reference No. 890.

USAEC, 1997. "Solar Detoxification of Soil" in Innovative Technology Demonstration, Evaluation and Transfer Activities, FY 96 Annual Report, Report No. SFIM-AEC-ET-CR-97013, pp. 99-100.

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Site Information:

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Points of Contact:

General FRTR Agency Contacts

Technology Specific Web Sites:

Government Web Sites

Non Government Web Sites

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Vendor Information:

A list of vendors offering Ex Situ Physical/Chemical Soil Treatment is available from the Vendor Information System for Innovative Treatment Technologies (VISITT) developed by U.S. Environmental Protection Agency (EPA).

Government Disclaimer

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Health and Safety:

Hazard Analysis

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Introduction Contaminants Treatments/Profiles References Appendices Navigation