A thermal desorption system for remediating contaminated material in a zero oxygen environment by heating a gas and flowing the heated gas through a core heating conduit traversing the interior of a material compartment of a bin filled with contaminated material, redirecting the flow of heated gas from the core heating conduit to a space between the exterior of the bin and the interior of a bin housing insulator encapsulating the bin to provide dual indirect heating to the contaminated material within the bin, directing off gases of contaminated vapors released by desorption from the material to an exhaust header through a plurality of vapor outlets, and condensing the offgas in the exhaust header.

A thermal desorption system for remediating contaminated material in a zero oxygen environment by heating a gas and flowing the heated gas through a core heating conduit traversing the interior of a material compartment of a bin filled with contaminated material, redirecting the flow of heated gas from the core heating conduit to a space between the exterior of the bin and the interior of a bin housing insulator encapsulating the bin to provide dual indirect heating to the contaminated material within the bin, directing off gases of contaminated vapors released by desorption from the material to an exhaust header through a plurality of vapor outlets, and condensing the offgas in the exhaust header.

Method for cleaning a material contaminated with an organic pollutant by heat treatment, where energy for heating the material is provided by direct heat treatment of the material in a hammermill. An organic polar additive with a boiling temperature above 100 C. is added to and mixed with the material prior to the direct heat treatment. A use of the organic polar additive is described as well.

The disclosure provides a soil-groundwater joint remediation device and a method. The soil-groundwater joint remediation device is disposed in an area to be remediated and includes an injection structure, an extraction structure, and a control structure. The injection structure is disposed in an injection well defined in the area to be remediated. The injection structure includes a hot air injection member, an oxidant injection member, and a micro-bubble injection member. The extraction structure is disposed in an injection well defined in the area to be remediated and spaced from the injection structure. The extraction structure includes a liquid phase extraction member and a gas phase extraction member. The control structure controls the liquid phase extraction member and the gas phase extraction member to perform an extraction operation.

The disclosure provides a soil-groundwater joint remediation device and a method. The soil-groundwater joint remediation device is disposed in an area to be remediated and includes an injection structure, an extraction structure, and a control structure. The injection structure is disposed in an injection well defined in the area to be remediated. The injection structure includes a hot air injection member, an oxidant injection member, and a micro-bubble injection member. The extraction structure is disposed in an injection well defined in the area to be remediated and spaced from the injection structure. The extraction structure includes a liquid phase extraction member and a gas phase extraction member. The control structure controls the liquid phase extraction member and the gas phase extraction member to perform an extraction operation.

The present invention provides a remediation method for degradation of cadmium in soil. The specific steps are as follows: step 1, determining the content of cadmium in the soil; step 2, crushing and sieving soil from a soil surface, and weighing; step 3, wetting the soil, and removing part of cadmium in the soil to obtain semi-remediated soil; step 4, mixing the semi-remediated soil with a remediation agent, and allowing to stand to obtain improved soil; and step 5, planting Bidens pilosa in the improved soil, and when a growing season is finished, uprooting, and ashing to obtain finished soil. The present invention utilizes anode and cathodes and a remediation agent to treat the cadmium contaminated soil, and plants Bidens pilosa in the soil to achieve a joint effect of electrodynamic remediation, chemical remediation, microbial remediation and phytoremediation to remediate the cadmium contaminated soil.

The present invention relates to an apparatus for treating waste containing mercury and a method for recovering high purity elemental mercury using the apparatus. More specifically, the present invention may provide a method that can more economically and stably recover high purity elemental mercury from waste containing mercury using an apparatus for recovering mercury from waste containing mercury, the apparatus comprising: a thermal desorption unit; a dust control unit; and a condensation and recovery unit, which are connected in series. The present invention has an advantage in that, compared to a conventional simple heat treatment-condensation method, a high recovery rate of mercury is achieved and high purity mercury can be obtained.

The present invention relates to an apparatus for treating waste containing mercury and a method for recovering high purity elemental mercury using the apparatus. More specifically, the present invention may provide a method that can more economically and stably recover high purity elemental mercury from waste containing mercury using an apparatus for recovering mercury from waste containing mercury, the apparatus comprising: a thermal desorption unit; a dust control unit; and a condensation and recovery unit, which are connected in series. The present invention has an advantage in that, compared to a conventional simple heat treatment-condensation method, a high recovery rate of mercury is achieved and high purity mercury can be obtained.

In-situ vitrification of hazardous waste occurs within human-made caverns. The human-made caverns may be located at distal (terminal) ends of substantially vertical wellbores and the human-made caverns may be located within deep geological rock formations, that are located at least two thousand feet below the Earth's surface. The hazardous waste that is vitrified into glass within such human-made caverns may be radioactive. The vitrification within a given human-made cavern is accomplished by at least one heater that operates according to a predetermined heating and cooling profile. During vitrification the heater may be reciprocated up and down to introduce currents into the waste liquid for uniform temperature dispersion. The heater may be removable, reusable, single use, and/or disposable. Cold caps and/or insulating blankets may be used over a given layer of vitrified waste product within the given human-made cavern. Heater weights, mixing vanes, and/or downhole sealing packer may also be used.

A contaminated medium (such as soil and/or groundwater) contaminated with petrogenic and/or other organic contaminants such as petroleum hydrocarbons, light non-aqueous phase liquids (NAPLs), dense non-aqueous phase liquids (DNAPLs), persistent organic pollutants (i.e. sulfolane), chlorinated compounds, and volatile organic compounds, can be mixed with enhanced stimulators and be thermally remediated. The enhanced stimulators are heat induced to undergo exothermic reactions, which initiate a series of in-situ chemical reactions to such as to produce hydrogen gas. The hydrogen gas causes hydrocracking of heavy hydrocarbons to produce light hydrocarbons which can be recovered such as for future use.