Major Pollutants
What is PCBs?
Poly Chlorinated Biphenyls
What is dehalogenation?
What does BCD stand for?
Base-Catalyzed Decomposition
What is GD?
Glycoate dehalogenation
Where is the case study from ?
New York /New Jersey
Where are Halogenated Compounds used?
Water treatment
Swimming pools chemicals
Plastic pipingwhat are the 2 types of dehalogenation?
BCD
GD
What is it used to remediate ?
Liquid
sludge
soil
sediment
What is used to move from a contaminated halogen to a clean halogen ?
Heat
How did the contaminants enter this area?
Municipal and industrial discharges
urban run-off
landfill sites
accidental spills
What are major contaminants?
PCBs
Dioxins
pesticides
what is chemical dechlorination ?
Reagents are used to remove chlorine from toxic chlorinated compounds.
What are the Advantages of using BCD ?
Less time and space to mobilize (set up and take down )
What is at least 1 disadvantage of GD?
Not suitable for remediation of contaminated material with high clay content ,acidity,organic content
Not designed for large waste volumes >5 % chlorinated compounds in it
space at the site for carrying out these processes
Where can these contaminants be detected ?
Fish and shellfish
What is used in high voltage electrical transformers?
PCBs
What is chemical dehalogenation?
Reductive dehalogenation in which the highly toxic halogen is removed leaving the less toxic substance behind
BCD eliminates the need to _______?
Remove the reactants from treated soil.
What are the 4 advantages of GD
Treatment time is short
moderate energy requirements
low maintenance and operational costs
mobility
How many stages was the treatment plan ?
2 stages
What makes halogenated organic compounds highly toxic?
Low Solubilities and they tend to bioaccumulate
Who presented on Dehalogenation?
Varsha ❤️
What can be easily transported and safely operated?
Components can be easily transported and safely operated
What are the 5 steps in GD
Preparation
reaction
separation
washing
dewatering
What was the range for the amount of soils removed?
99.9997 - 99.99 %