Pollution & Clean-up
Think Tank What do you think is happening in this picture? Take 2 minutes to write down your answer on the top or back of your notes.
2 Types of Pollution Point Source Pollution › Pollution from one specific source Nonpoint Source Pollution › Pollution from a widely spread source
Sources of Pollution Human Waste › Heavy rain overflows sewers › Septic tanks leak › Animal waste runoff from farms
Sources of Pollution Industrial Wastes › Toxic chemicals and strong acids released directly from factories › Toxic waste storage barrels leak › Exhaust from burning coal and oil resulting in acid rain › Heated water released by factories
Sources of Pollution Chemical Runoff › Pesticide and fertilizer runoff from farms › Oil runoff from roads
Cleaning it up Plants & Bacteria › Naturally filter out and break down waste
Cleaning it up Wetlands › Filter waste and neutralize pH
Cleaning it up Filtration › Passing water through screens to remove larger particles
Cleaning it up Coagulation › A chemical is added to cause particles in water to form sticky globs, easier to remove
Cleaning it up Chlorination › Chlorine is added to kill diseases
Cleaning it up Aeration › Air is forced through purified water to reduce odors and tastes
Cleaning it up Sedimentation › Gravity causes particles to settle to bottom of container