420 Soil and SW remediation

420 Soil and SW remediation
Verified Questions &
Answers
Excavation and Disposal/Treatment – ANSWERS
 Landfill
 Asphalt batching
 Solidification/Stabilization
 Vitrification
 Thermal desorption
 Incineration

In situ Techniques – ANSWERS
 Capping
 In situ Vitrification
 Soil Vapor Extraction
 Bioremediation
 Phytoremediation

Excavation with Landfill Disposal – ANSWERS
 Must test to see if classified as hazardous waste
 If so, must be disposed of in Hazardous Waste Landfill
 Double liner
 Expensive

Excavation with Solidification / Stabilization – ANSWERS
 May be used to reduce leachability or toxicity of contaminants before disposal
 Particularly good for metals
 Solidification - turning waste into an encased block
 Mixing with cement
 Stabilization - adding material to change chemical properties of waste
 Adding lime or absorbent

Vitrification (after excavation or in situ) – ANSWERS
 Turning to glass
 Good for radioactive waste
 Expensive
 Waste is mixed with sand-like borosilicate glass and heated to 2100 °F
 Can be done in situ using powerful electrodes

Excavation with Asphalt Batching – ANSWERS
 Use contaminated soil as aggregate in production of asphalt