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Transcript of Water Pollution
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Water PollutionWater Pollution
G. Tyler Miller’sLiving in the Environment
13th Edition
Chapter 19
G. Tyler Miller’sLiving in the Environment
13th Edition
Chapter 19
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What is water pollution?What is water pollution?
Any chemical, biological, or Any chemical, biological, or physical change in water physical change in water quality that has a quality that has a harmfulharmful effect on living organisms or effect on living organisms or makes water makes water unsuitableunsuitable for for desired uses.desired uses.
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Major CategoriesMajor Categories
1.1. Infectious AgentsInfectious Agents
2.2. Oxygen-Demanding WastesOxygen-Demanding Wastes
3.3. Inorganic ChemicalsInorganic Chemicals
4.4. Organic ChemicalsOrganic Chemicals
5.5. Plant NutrientsPlant Nutrients
6.6. SedimentSediment
7.7. Radioactive MaterialRadioactive Material
8.8. Heat (Thermal Pollution)Heat (Thermal Pollution)
Review Table 19.1!!
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Common Diseases Transmitted Through Contaminated Drinking Water
Common Diseases Transmitted Through Contaminated Drinking Water
Type of Organism Disease
Bacteria Typhoid fever
Cholera
Bacterial Dysentery
Enteritis
Viruses Infectious hepatitis
Parasitic Protozoa Amoebic Dysentery
Giardiasis
Parasitic Worms Shistosomiasis
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Effects of Yuck WaterEffects of Yuck Water• Premature death of 3.4 million
people worldwide each year• Diarrhea alone kills 2.1 million
people
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How do we measure water quality?How do we measure water quality?
Fecal Coliform Test
Drinking Drinking waterwater
0 colonies 0 colonies per 100 mlper 100 ml
Swimming Swimming waterwater 200 200
colonies colonies per 100 mlper 100 ml
Presence or Absence of Harmful Pollutants
Concentration of Harmful Pollutants
HUMAN CONSUMPTION
RECREATION
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How do we measure water quality?How do we measure water quality?• Measuring the level of Measuring the level of DDissolved Oxygen issolved Oxygen
(DO)(DO)Fig. 19-3 p. 485Fig. 19-3 p. 485
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How do we measure water quality?How do we measure water quality?• Using Using DO + BOD measurementsDO + BOD measurements
• UsingUsing chemical analysis chemical analysis– Presence/Absence and concentrationPresence/Absence and concentration
• Using Using indicator speciesindicator species– macroinvertebratesmacroinvertebrates
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Sources of Water PollutionSources of Water Pollution
• Point SourcesPoint Sources– Discharge of pollutants at specific
locations through pipes, ditches, or sewers into bodies of surface water.•Easier to control
• Non-Point SourcesNon-Point Sources– pollutants cannot be traced to any pollutants cannot be traced to any
single source of discharge, diffuse single source of discharge, diffuse sourcessources•Difficult to controlDifficult to control
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Point and Nonpoint SourcesPoint and Nonpoint Sources
NONPOINT SOURCESNONPOINT SOURCES
Urban streets
Suburban development
Wastewater treatment plant
Rural homes
Cropland
Factory
Animal feedlot
POINT POINT SOURCESSOURCES
Fig. 19-4p. 486
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Pollution of StreamsPollution of Streams DO + BOD Relationships DO + BOD Relationships
Fig. 19-5 p. 488
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Oxygen Sag CurveOxygen Sag Curve
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Pollution of LakesPollution of Lakes• Slow turnover
– Flushing and changing of water temp
• Thermal stratification– Little vertical mixing
• Biological Magnification• Increase in the concentration of chemicals in
organisms at successively higher trophic levels of a food chain
• Eutrophication• Natural nutrient enrichment of lakes
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Water0.000002 ppm
Phytoplankton0.0025 ppm
Zooplankton0.123 ppm
Rainbow smelt1.04 ppm
Lake trout4.83 ppm
Herring gull124 ppm
Herring gull eggs124 ppm
Biomagnification
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1. Eutrophication – enrichment of a body of water by inorganic plant and algal nutrients Creates an environmental problems as:
excess nutrients enter water systemincreases photosynthetic productivity numbers of algae and cyanobacteria increase water become cloudy (turbid) from population increasepopulations die off and sink to bottombecome food for decomposers decomposers BOD but DO in waters fish die offother species take root in nutrient rich sediments and begin to fill in waters
Lake said to be eutrophic! Cultural or artificial eutrophication can occur as nutrient levels are increased from sewage or agricultural runoff into waterways!
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Pollution of LakesPollution of Lakes Cultural Eutrophication Cultural Eutrophication
Fig. 19-7 p. 491Fig. 19-7 p. 491
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Oligotrophic WatersOligotrophic Waters Oligotrophic waters – have minimal levels of nutrients, unenriched, clear waters, small populations of aquatic organisms
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Reducing Surface Water PollutionReducing Surface Water Pollution
Nonpoint SourcesNonpoint Sources Point SourcesPoint Sources
Reduce runoff Reduce runoff
Buffer zone vegetation
Buffer zone vegetation
Reduce soil erosion Reduce soil erosion
Clean Water Act Clean Water Act
Water Quality Act Water Quality Act
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POLLUTION OF GROUNDWATERPOLLUTION OF GROUNDWATER
• It can take hundreds to thousand of years for contaminated groundwater to cleanse itself of degradable wastes.
– Nondegradable wastes (toxic lead, arsenic, fluoride) are there permanently.
– Slowly degradable wastes (such as DDT) are there for decades.
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Groundwater Pollution: SourcesGroundwater Pollution: Sources
Coal strip mine runoff
Pumping well
Waste lagoon
Accidental spills
Groundwater flow
Confined aquifer
Discharge
Leakage from faulty casing
Hazardous waste injection wellPesticides
Gasoline station
Buried gasoline and solvent tank
Sewer
Cesspool septic tank
De-icing road salt
Unconfined freshwater aquifer
Confined freshwater aquifer
Water pumping well Landfill
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Fig. 21-8, p. 502
Aquifer
Water well
Migrating vapor phase
Contaminant plume moveswith the groundwater
Free gasolinedissolves ingroundwater(dissolved phase)
Groundwaterflow
Watertable
Gasolineleakage plume(liquid phase)
Leakingtank
Bedrock
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Groundwater Pollution PreventionGroundwater Pollution Prevention
•Monitoring aquifers•Leak detection systems•Strictly regulating hazardous
waste disposal•Storing hazardous waste
materials above ground
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Water Break
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Sewage TreatmentSewage Treatment
• Septic tanks and various levels of sewage treatment can reduce point-source water pollution.
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Sewage TreatmentSewage Treatment• Raw sewage reaching a municipal
sewage treatment plant typically undergoes:
– Primary sewage treatment: a physical process that uses screens and a grit tank to remove large floating objects and allows settling.
– Secondary sewage treatment: a biological process in which aerobic bacteria remove as much as 90% of dissolved and biodegradable, oxygen demanding organic wastes.
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Sewage TreatmentSewage Treatment
• Primary and Secondary sewage treatment.
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Fig. 21-16, p. 511
Raw sewagefrom sewers
Activated sludge
Disposed of in landfill or ocean or applied to cropland,pasture, or rangeland
Primary Secondary
Grit chamberBar screen Settling tank Aeration tank Settling tankChlorinedisinfection tank
Sludge drying bed
Sludge digester
Air pump
To river, lake,or ocean
(kills bacteria)
Sludge
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Primary TreatmentPrimary Treatment
PRIMARY removes suspended/floating particle screening and settling
Material removed called primary sludge
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Secondary Treatment Secondary Treatment
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Secondary TreatmentSecondary TreatmentSECONDARY microorganisms decompose suspended organic material
trickling filters = water flows through aerated rock beds with bacteria to degrade organic materialactivated sludge process = aerated and circulated water with bacteria is allowed to settle out creating secondary sludgeNOW FREE OF SEWAGE!
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Sewage TreatmentSewage Treatment• Advanced or tertiary sewage
treatment:– Uses series of chemical and physical
processes to remove specific pollutants left (especially nitrates and phosphates).
• Water is chlorinated to remove coloration and to kill disease-carrying bacteria and some viruses (disinfect).
• TERTIARY bio/chem/phy process that removes dissolved minerals (N & P), metals, viruses, organic cmpds
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Sludge Disposal OptionsSludge Disposal Options• Anaerobic digestion (need space and
time)• Convert to Fertilizer (Town of Cary) • Incineration (Carbon dioxide emissions
– ash disposal harmful)• Ocean Dumping – BAN in 1988/1991• Landfill Disposal
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Technological Approach: Advanced Sewage Treatment
Technological Approach: Advanced Sewage Treatment
Removes specific pollutants Removes specific pollutants
Fig. 19-18p. 505
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DRINKING WATER QUALITYDRINKING WATER QUALITY• Centralized water treatment plants
and watershed protection– can provide safe drinking water for city
dwellers in developed countries.
• Simpler and cheaper ways can be used to purify drinking water for developing countries.– Exposing water to heat and the sun’s UV rays
for 3 hours can kill infectious microbes.
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2 million plastic bottles,dumped every 5 minutes.2 million plastic bottles,
dumped every 5 minutes.
Is Bottled Water the Answer?
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Is Bottled Water the Answer?Is Bottled Water the Answer?• Some bottled water is not as pure as tap
water and costs much more.
• 1.4 million metric tons of plastic bottles are thrown away.
• Fossil fuels are used to make plastic bottles.– The oil used to produce plastic bottles in the U.S.
each year would fuel 100,000 cars.
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Safe Drinking Water Act (1974)Safe Drinking Water Act (1974)
- set uniform standards for drinking water across US
- states had various standards prior to this date • EPA determined MCLs (maximum
contaminant levels)• EPA oversees program• Amended 1986 & 1996 • 1996 Amendment required disclosure to
citizens of contaminants in water
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CLEAN WATER ACT (1977)CLEAN WATER ACT (1977)Amended 1981 & 1987-formerly known as Water Pollution Control ActTWO MAIN GOALS•eliminate discharge of pollutants•attain water quality for safe fishing and swimming
– CWA effective at improving water quality at point sources – Point source discharges must obtain NPDES permits
•(National Pollutant Discharge Elimination System) to release untreated wastewater into waterways • •Nonpoint Source discharges very difficult to control •1987 NPDES permit needed for nonpoint source discharges•CWA not as effective at monitoring these discharges due to lack of cooperation/coordination between govt, citizens, and industry •
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CLEAN WATER ACTCLEAN WATER ACT– CWA effective at improving water quality at point sources – Point source discharges must obtain NPDES permits
• (National Pollutant Discharge Elimination System) to release untreated wastewater into waterways
• Nonpoint Source discharges very difficult to control • 1987 NPDES permit needed for nonpoint source
discharges• CWA not as effective at monitoring these discharges
due to lack of cooperation/coordination between govt, citizens, and industry
•
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CLEAN WATER ACTCLEAN WATER ACT
• 1987 NPDES permit needed for nonpoint source discharges
• CWA not as effective at monitoring these discharges due to lack of cooperation/coordination between govt, citizens, and industry