Water Purification & Pollution. How Water Treatment Works https://www.youtube.com/watch?v=t uYB8nMFxQA https://www.youtube.com/watch?v=t uYB8nMFxQA.

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Presentation transcript:

Water Purification & Pollution

How Water Treatment Works uYB8nMFxQA uYB8nMFxQA

During our lab, what 4 steps in the water treatment process did we use? Aeration Coagulation Sedimentation Filtration

Aeration Gas bubbles escape Oxygen is added

Coagulation Alum is added –sticks to solid particles so that they clump together and separate from water – “floc”

Sedimentation Gravity pulls the floc to the bottom in settling basins

Filtration Remaining water is filtered through sand, pebbles

What is the 5 th step? Adding disinfectants to water to purify it and kill any organisms

How long does cardboard take to break down? 2 weeks

How long does it take photodegradable packaging to break down? 6 weeks

How long does it take newspaper to break down? 6 weeks

How long does it take styrofoam to break down? 80 years

How long does it take for aluminum to break down? 200 years

How long does it take plastic packaging to break down? 400 years

How long does it take glass to break down? Takes so long that we do not know fully

CHALLENGE WATER POLLUTION SCENARIOS: How do these activities lead to water pollution? 6 th Grade

Allowing Animals to graze directly next to a stream

1) Wastes pass disease-carrying bacteria 2) prevents soil from eroding, so that water does not travel faster and further 2) Loss of riparian vegetation Plantlife that exists along a waterway Benefit: absorb pollutants before they exit downstream

Fields left empty after harvesting crops

1) soil is looser, filled with fertilizers and pesticides, so it erodes more quickly, carrying them further

PowerPlants returning water that is not polluted into a river after using it to cool down machines

Warm water (even if not polluted) causes many organisms to die

Having fun on a motorboat with friends

*Oil and gas to keep it moving Harms wildlife Hard to get out of water *Litter can easily get into the water (marine dumping)

Driving a car down a highway

Oil and gas spills  road is impermeable, surface runoff carries it to nearby ponds/lakes/rivers Litter

Putting salt on the road after a snow day to make it less slippery

Rain carries salt to freshwater sources Can change the LAKE TURNOVER process Damages plants

Using cleaning products labeled “environmentally friendly” and “biodegradable”

Remove oxygen from the water

Using laundry detergents with phosphates in them

Phosphates are food to algae Cause Eutrophication

Mercury is emitted into the air by burning coal for fuel

Atmospheric Deposition: pollutes air, creating acid rain mercury poisoning