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 too There are 2 common ways to fix pollution…what would they be?? ________________________________

What are sources of pollution?

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?

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 packing material 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 contaminants Contaminants are converted to _____________________ such as carbon dioxide Often used in ________________ treatment plants in cities and can be used for ______________

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

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: