5.5 - Detox for Contaminated Land Flashcards
Mainly focused on remediations
What are the 3 classifications of remediation technologies to treat contaimated soil?
Physical
Chemical
Biological
What is an example of Physical Remediation?
Soil Flushing
Soil Flushing
Pumping large volumes of fluid through the soil in order to flush out and collect contaminants
What fluids can be used for soil flushing?
water, acids, bases, solvents, detergents
What concerns are there for soil flushing?
Ensure that flushing fluid does not excape into environment.
What are 3 types of Chemical Remediation?
Stabilization and Solidification
Electrolysis
Chemical Oxidation
Stabilization and Solidification
Stabilzation: convert a contaminant into safe form (eg. precipitate)
Solidification: mixing “safe form” with binding agent and burying it into the ground.
What does the binding agent prevent?
Prevents dissolved ions from moving with groundwater and contaminating other water sources
Electrolysis
➡️Electrical conductors (electrodes) insterted into ground
➡️Voltage applied across them
➡️Positively charged metal ions move and attach onto negatively charged electrode (with moist ground)
➡️Metal builds up on elctrodes and can be safely removed and recycled
Chemical Oxidation
Using chemical reactions to convert contaminants into less hazardous substance
Chemicals are put into the ground via large drills or augers; liquids can be injected into ground via pressure
Benefit(s) of Bioremediation
cost-effective
less disruptive to contaminated area
Drawback(s) of Bioremediation
Takes longer
Bioremediation
using living things/organisms (eg. microbes) to remove pollutants from a contaminated cites
Phytoremediation
using plants to remediate the soil/water
What are hyperaccumulators?
plants which have an unusually high ability to take in and trap metals
eg. sunflowers
