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Soil Contamination and Remediation
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Pesticides (e.g., DDT, Atrazine)
Adsorption: using activated carbon or other materials to bind and remove pesticides from the soil.
Chlorinated Solvents (e.g., TCE, PCE)
In Situ Chemical Oxidation (ISCO): injecting oxidants to transform solvents into non-hazardous substances.
Sulfates
Constructed Wetlands: using artificial wetland systems to promote sulfate reduction through microbial activity.
Plastics (Microplastics)
Electrokinetic Remediation: applying an electric current to the soil to move charged particles like microplastics to collection points.
Volatile Organic Compounds (VOCs)
Soil Vapor Extraction (SVE): applying a vacuum to the soil to extract VOCs as vapors.
Petroleum Hydrocarbons (e.g., oil spills)
Bioremediation: using microorganisms to break down hydrocarbons into less harmful substances.
Polycyclic Aromatic Hydrocarbons (PAHs)
Soil Washing: using a washing solution to separate PAHs from soil particles.
Radioactive Contaminants (e.g., Uranium, Cesium)
Phytoextraction: using certain plants to absorb radioactive contaminants from the soil.
Pharmaceuticals
Advanced Oxidation Processes (AOPs): using processes like UV radiation and ozone to degrade pharmaceuticals into less harmful substances.
Salt Contamination (e.g., from road deicing)
Soil Flushing: flushing the soil with water or other solutions to wash out soluble salts.
Nitrates
Denitrification: a microbial process that converts nitrates into nitrogen gas, which is then released into the atmosphere.
Asbestos
Encapsulation: covering or sealing asbestos-contaminated soil to prevent the release of fibers.
Heavy Metals (e.g., Lead, Mercury, Arsenic)
Phytoremediation: using plants to absorb, concentrate, and precipitate heavy metals from the soil.
Cyanides
Alkaline Chlorination: treating cyanides with chlorine and alkali to convert them into cyanates, which are less toxic.
Polychlorinated Biphenyls (PCBs)
Thermal Desorption: using heat to volatilize PCBs from the soil, followed by condensation and collection of the vapors.
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