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Waste Final Quiz

Modules 10 and 11

What is the final cover? 30 cm thick cover soil
What should the final cover provide? Protection from extreme weather, withstand corrosion, provide structural stability, resist settlement, resist reactions, and resist disruptions by plantlife
Layers of the cap (bottom to top) Final Lift, Subcase, Barrier Layer (geomembrane), Drainage Layer (sand/gravel), Protective Layer, Surface Layer
Sub base details Low to medium field capacity Follows contour of land May include gas collection
Barrier Level details Geomembrane Prevents water infiltration and gas from leaving
Drainage Layer Details Low field capacity Directs percolated moisture away from the landfill
Protective layer details High field capacity soil
Surface layer details High field capacity and supports growth of plants
How do you plant trees in the cap? The hole must be at least twice the size of root depth
T or F 90% of landfill settlement will occur in the first five years post closure. True
Why is landfill settlement inversely proportional to compaction? -decomposition, gas loss, leachate generation decreases -overburden pressure
Hazardous waste regulations in AB AEPEA AER Public Health Act Federal Atomic Energy Control Act Transportation of Dangerous Goods Act
Two ways of classifying hazardous waste in AB? By the AEPEA Waste Managers Guide or by AER Directive 058
Four questions in determining wastes 1. Is it a waste 2. Is it exempt 3. Is it hazardous 4. Can it be landfilled
What even is a substance Anything that can be dispersed or transformed
Why might a waste be exempt under the waste regulation? -Not hazardous -Regulated by another act -Too hazardous
Why might a waste be hazardous? - Discarded chemicals -Unique waste stream -Has specific characteristics
Characteristics of a hazardous waste -Too liquidy, under pH 2, over pH 12, flashpoint less than 61C, spontaneously combusts -Oral LD50 below 5000ppm -Dermal LD50 below 1000ppm -Inhalation LD50 below 10 000ppm -More than 50ppm PCB
TCLP meaning Toxicity Characteristic Leaching Procedure
DOW meaning Dangerous Oilfield Wastes
T or F DOW is the same as hazardous waste Basically true
Stabilization vs solidification Stabilization decreases solubility, solidification converts waste to a solid
What is waste fixation Stabilization and solidification
What is sorption? Sponging off the liquid
What are pozzolan processes? Using volcanic ash to convert to an inert solid waste
What is thermoplastic encapsulation? Radioactive waste dispersed in a heated matrix like asphalt
What is vitrification? Combine waste with molten glass, which is costly and used for highly toxic waste
What should the destruction removal efficiency be if using incineration? 99.999%
Example of solid waste incinerator Rotary kiln incinerator
Example of wet waste incinerator Liquid injection incineration
Concept of deep well injection Dispose hazardous waste into a deep confined aquifer
Disposal well details -Fill the annular space with a noncorrosive liquid to detect leaks - Packing between casings
Issues with deep well disposal -What if it leaks -Wastes water that could be recovered
Created by: swilson67
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