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Soil Contamination and Remediation

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Pesticides (e.g., DDT, Atrazine)

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Adsorption: using activated carbon or other materials to bind and remove pesticides from the soil.

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Chlorinated Solvents (e.g., TCE, PCE)

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In Situ Chemical Oxidation (ISCO): injecting oxidants to transform solvents into non-hazardous substances.

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Sulfates

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Constructed Wetlands: using artificial wetland systems to promote sulfate reduction through microbial activity.

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Plastics (Microplastics)

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Electrokinetic Remediation: applying an electric current to the soil to move charged particles like microplastics to collection points.

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Volatile Organic Compounds (VOCs)

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Soil Vapor Extraction (SVE): applying a vacuum to the soil to extract VOCs as vapors.

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Petroleum Hydrocarbons (e.g., oil spills)

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Bioremediation: using microorganisms to break down hydrocarbons into less harmful substances.

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Polycyclic Aromatic Hydrocarbons (PAHs)

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Soil Washing: using a washing solution to separate PAHs from soil particles.

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Radioactive Contaminants (e.g., Uranium, Cesium)

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Phytoextraction: using certain plants to absorb radioactive contaminants from the soil.

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Pharmaceuticals

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Advanced Oxidation Processes (AOPs): using processes like UV radiation and ozone to degrade pharmaceuticals into less harmful substances.

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Salt Contamination (e.g., from road deicing)

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Soil Flushing: flushing the soil with water or other solutions to wash out soluble salts.

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Nitrates

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Denitrification: a microbial process that converts nitrates into nitrogen gas, which is then released into the atmosphere.

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Asbestos

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Encapsulation: covering or sealing asbestos-contaminated soil to prevent the release of fibers.

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Heavy Metals (e.g., Lead, Mercury, Arsenic)

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Phytoremediation: using plants to absorb, concentrate, and precipitate heavy metals from the soil.

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Cyanides

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Alkaline Chlorination: treating cyanides with chlorine and alkali to convert them into cyanates, which are less toxic.

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Polychlorinated Biphenyls (PCBs)

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Thermal Desorption: using heat to volatilize PCBs from the soil, followed by condensation and collection of the vapors.

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