Reversing Water Pollution

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

How is polluted water cleaned?Not easy to reverse the effects of water pollution

It can be very expensive tooThere are 2 common ways to fix pollution…what would they be??________________________________________________________________

What are sources of pollution?

Removing the source:Depends on the _____________________________ of

pollutionCould 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 boundariesWhich types of pollution can you identify from the

picture on the previous slide?

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?

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 _________________________

Air Stripping:Uses ____to remove contaminants that

_________________________Polluted water is ______________into a

tank and then __________ over packing material

Water ___________through the packingmaterial and a _________over the water to help it evaporate

_________ collected at the top of the tank are treated to prevent further pollution

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

Bioremediation:Uses naturally occurring

_____________________ to digest contaminantsContaminants are converted to

_____________________ such ascarbon dioxide

Often used in ________________treatment plants in cities and can be used for ______________

Phytoremediation:________________ are used

to remove pollutantsThe ______of the plant

take up the contaminants at the same time as ____________________

Contaminants are ________ in the roots and leaves

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

Chemical Oxidation: