1. Reversing Water Pollution

2. Water Facts:
______ of the Earth is covered by water but only ________ is _____________________water
One litre of _______________ pollutes about ______ litres of freshwater
It’s estimated that there is _____________________ of freshwater worldwide

3. How is polluted water cleaned?
Not easy to reverse the effects of water pollution
It can be very expensive too
There are 2 common ways to fix pollution…what would they be??
________________________________

4. What are sources of pollution?

5. Removing the source:
Depends on the _____________________________ of pollution
Could be from one of __________ source types:
_______________________
The exact place where pollution occurs can be identified
The exact place where pollution occurs cannot be identified but the region can be identified
This type of pollution occurs across governmental boundaries
Which types of pollution can you identify from the picture on the previous slide?

6. Why not remove the source all of the time?
If removing the source of the pollution gets rid of it… why not do it all of the time??
___________________ __________________
_____________
Others?

7. Removing the contaminants:
This is the second way to clean up water pollution -
_______________techniques are used
Can be used individually or in combination
Most involve ________________________, _________ the water, and then pumping it _________________________

8. Air Stripping:
Uses ____to remove contaminants that _________________________
Polluted water is ______________into a tank and then __________ over packing material
Water ___________through the packing material and a _________over the water to help it evaporate
_________ collected at the top of the tank are treated to prevent further pollution

9. Activated Carbon Filtration:
Polluted water is sent through _______________ _______________________
Chemicals stick to the surface & pores of the ___________________ and clean water flows through
Filters are ___________ or _______________when they are full

10. Bioremediation:
Uses naturally occurring _____________________ to digest contaminants
Contaminants are converted to _____________________ such as carbon dioxide
Often used in ________________ treatment plants in cities and can be used for ______________

11. Phytoremediation: ________________ are used to remove pollutants
The ______of the plant take up the contaminants at the same time as ____________________
Contaminants are ________ in the roots and leaves

12. Chemical Oxidation:
_____________ are used to convert chemicals into _________________________chemicals
_____ are drilled into the ___________source & the oxidants are pumped in
Contaminants are removed ____________and are treated and easily disposed of

13. Chemical Oxidation: