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Contaminated Soil Treatment
Clean Earth provides various treatment options for non-hazardous and hazardous soil contamination. The combination of our various technologies, locations, and experienced team will result in a soil treatment and recycling or disposal plan that works specifically for your project site.
Thermal desorption is an environmental remediation technology that is used to treat material with a broad range of hydrocarbon contamination. This process involves heating soil in a rotating dryer to remove or separate the contaminants from the soil. This process is often referred to as “low temp” thermal desorption to differentiate it from high temperature incineration. This method is primarily used to treat soil with high levels of contaminants, such as MGP soil, by heating it in a rotating dryer to destroy contaminants.
Low Temperature Thermal Desorption (LTTD) technology utilizes heat to physically separate contaminants from soil and media. LTTD units are designed to heat contaminated soils in the rotary kiln (primary treatment unit) to temperatures sufficient to volatilize the contaminants and desorb (physically separate) from the soil or media. The vaporized hydrocarbons are treated in a secondary treatment unit – afterburner/thermal oxidizer – where the hydrocarbons are destroyed prior to discharge to the atmosphere. Pre-processing of soil is often necessary when using thermal desorption and can include screening and blending. The oversized materials may be sized and introduced back into the feed material or decontaminated for beneficial use.
Treated soils are rehydrated to control fugitive emissions, stockpiled for analysis, and recycled as alternate daily cover (landfill) or cap/cover material on a Beneficial Use (BU) site.
Bioremediation is a treatment process that provides a cost effective and environmentally conscious recycling solution for non-hazardous contaminated soils. Through a process called bioaugmentation, microorganisms are introduced into the contaminated environment as a granular product, with a proper nutrient mix to stimulate and foster their growth while breaking down the contaminants in the soil.
The process degrades organic contaminants, such as petroleum hydrocarbons, in the soil by the application of cultured microorganisms selected for their ability to metabolize the petroleum products.
Soil that is lightly contaminated with petroleum hydrocarbons is inoculated with engineered bacteria and nutrients that combine to completely break down soil contaminants in 7 to 14 days. Bioremediation is typically used on soil with lower levels of contaminants. The resulting treated soil is recycled as fill material or landfill capping or cover.
Chemical fixation is a soil remediation process used to treat hydrocarbon contaminated soil and/or metal contaminated soil. This process involves stabilizing contaminated material by mixing it with other earthen material, and then treating the blended material with certain chemical additives to formulate a particular material. This treatment binds the petroleum contaminants and prevents leaching. Chemcial fixation is best used for light to medium hydrocarbon contamination and/or contaminated soil impacted by metals.
Physical treatment of soil includes special sizing and segregation processes to remove unsuitable materials from incoming soils. The resulting soils generate an engineered material suitable for beneficial reuse as fill material or landfill capping or cover.