Reversing Water Pollution Water Facts of the Earth

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 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: