chapter 5 air and water resources

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Chapter 5 Air and Water Resources. Finding Pollution Solutions Section 3 Notes 5-4. Reducing Air Pollution. Clean Air Act : development of air pollution control technologies Scrubbe r: removes pollutants from air with a stream of water droplets - PowerPoint PPT Presentation


Chapter 4 Air and Water Resources

Finding Pollution SolutionsSection 3Notes 5-4Chapter 5

Air and Water ResourcesReducing Air PollutionClean Air Act: development of air pollution control technologiesScrubber: removes pollutants from air with a stream of water dropletsPollutants fall into a container after being dissolved in the waterFilters: trap particles of soot and ashCatalytic Converter: device on vehiclesReduces carbon monoxide emissions by forming less harmful carbon dioxide and waterReducing Air PollutionCFC substitutes1987 many nations agreed to stop using CFCs by 2000.Refrigerators and air conditioners use less harmful substancesNew ways to create plastic foam without CFCs

Cleaning Up the WaterTo reduce water pollution:Treat wastes so they are less harmfulFind substitutes for pollutants

Sewage TreatmentPrimary Treatment: removes solid materials from wastewaterWater passes through filtersSolids are held in tanks and particles settle outCleaning Up the WaterSecondary Treatment: bacteria break down solid wastesWater is treated with chlorine to kill disease causing organismsArcata, CAWastewater flows into ponds with algaeAlgae breaks down sewageWater moves to marshes with cattails and bulrushes to clean the waterAreas are also for habitats for fish and birdsAlso areas for bike riding and trails for recreation Cleaning Up the WaterOil and GasolineOil spills can be cleaned up with bacteriaBacteria eat the oil and reproduce as long as there is foodThey die off as soon as their food disappearsBig oil spills affect the wildlife before the bacteria can restore the ecosystemGasoline spills are hard to clean upSoil can be removedHowever, if gasoline reaches the groundwatermuch worse!Water has to be pumped out and cleanedThen it can be put back into the groundCleaning Up the WaterIndustrial ChemicalsIndustries can recycle their wastesThey save money and reduce pollutionIndustries can change how they produce their productUse less water or create less harmful wastesFarming ChemicalsFinding alternatives to pesticides and fertilizersDDT (dichloro-diphenyl-trichloroethane)1972 DDT usage was stoppedToday it is labeled as a probable human carcinogen Stays in an organism for a long timeWhat can you do?Little changes can make a big differenceWalk or ride a bikeSave electricity by turning off lights and other devicesCarpoolBuy a more fuel efficient vehicleDont pour chemicals down the drainDont put old medicines in the toilet


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