water pollution chapter 22. john todd’s living machine sewage flows into passive solar greenhouse...
TRANSCRIPT
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Water Pollution
Chapter 22
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John Todd’s Living Machine
Sewage flows into passive solar greenhouse or outdoor sites containing rows of large open tanks
1st tanks- algae & microorganisms decompose organic wastes
Water hyacinths, cattails, bulrushes, other aquatic plants use remaining nutrients
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Water runs through artificial marsh (sand, gravel, bulrush plants) that filters out algae & remaining organic wastes
Aquarium tasks- snails & zooplankton consume microorganisms & in turn are consumed by crayfish, tilapia, other fish & can be eaten or sold as bait
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10 days later- 2nd artificial marsh Purified for drinking by exposing to UV
light or passing through ozone generator
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Water Pollution
Any chemical, biological, or physical change in water quality that has a harmful effect on living organisms or makes water unsuitable for desired uses
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Table 22-1Page 492
Table 22-1 Major Categories of Water Pollutants
INFECTIOUS AGENTS
Examples: Bacteria, viruses, protozoa, and parasitic worms
Major Human Sources: Human and animal wastes
Harmful Effects: Disease
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Table 22-1Page 492
Table 22-1 Major Categories of Water Pollutants
OXYGEN-DEMANDING WASTES
Examples: Organic waste such as animal manure and plant debris that can be decomposed by aerobic (oxygen-requiring) bacteria
Major Human Sources: Sewage, animal feedlots, paper mills, and food processing facilities
Harmful Effects: Large populations of bacteria decomposing these wastes can degrade water quality by depleting water of dissolved oxygen. This causes fish and other forms of oxygen-consuming aquatic life to die.
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Table 22-1Page 492
Table 22-1 Major Categories of Water Pollutants
INORGANIC CHEMICALS
Examples: Water-soluble 1) acids, (2) compounds of toxic metals such as lead (Pb),arsenic (As), and selenium Se), and (3) salts such as sodium chloride (NaCl) in ocean water and fluorides (F–) found in some soils
Major Human Sources: Surface runoff, industrial effluents, and household cleansers
Harmful Effects: Can (1) make fresh water unusable for drinking or irrigation, (2) cause skin cancers and crippling spinal and neck damage (F–), (3) damage the nervous system, liver, and kidneys (Pb and As), (4) harm fish and other aquatic life, (5) lowercrop yields, and (6) accelerate corrosion of metals exposed to such water.
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Table 22-1Page 492
Table 22-1 Major Categories of Water Pollutants
ORGANIC CHEMICALS
Examples: Oil, gasoline, plastics, pesticides, cleaning solvents, detergents
Major Human Sources: Industrial effluents, household cleansers, surface runoff fromfarms and yards
Harmful Effects: Can (1) threaten human health by causing nervous system damage (some pesticides), reproductive disorders (some solvents), and some cancers(gasoline, oil, and some solvents) and (2) harm fish and wildlife.
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Table 22-1Page 492
Table 22-1 Major Categories of Water Pollutants
PLANT NUTRIENTS
Examples: Water-soluble compounds containing nitrate (NO3 –), phosphate (PO43–), and
ammonium (NH4+) ions
Major Human Sources: Sewage, manure, and runoff of agricultural and urban fertilizers
Harmful Effects: Can cause excessive growth of algae and other aquatic plants, which die, decay, deplete water of dissolved oxygen, and kill fish. Drinking water with excessive levels of nitrates lowers the oxygen-carrying capacity of the blood and can kill unborn children and infants (“bluebaby syndrome”).
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Table 22-1Page 492
Table 22-1 Major Categories of Water Pollutants
SEDIMENT
Examples: Soil, silt
Major Human Sources: Land erosion
Harmful Effects: Can (1) cloud water and reduce photosynthesis, (2) disrupt aquatic food webs, (3) carry pesticides, bacteria, and other harmful substances, (4) settle out and destroy feeding and spawning grounds of fish, and (5) clog and fill lakes, artificial reservoirs, stream channels, and harbors.
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Table 22-1Page 492
Table 22-1 Major Categories of Water Pollutants
RADIOACTIVE MATERIALS
Examples: Radioactive isotopes of iodine, radon, uranium, cesium, and thorium
Major Human Sources: Nuclear and coal-burning power plants, mining and processing of uranium and other ores, nuclear weapons production, natural sources
Harmful Effects: Genetic mutations, miscarriages, birth defects, and certain cancers
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Table 22-1Page 492
Table 22-1 Major Categories of Water Pollutants
HEAT (THERMAL POLLUTION)
Examples: Excessive heat
Major Human Sources: Water cooling of electric power plants and some types of industrial plants. Almost half of all water withdrawn in the United States each year isfor cooling electric power plants.
Harmful Effects: Lowers dissolved oxygen levels and makes aquatic organisms more vulnerable to disease, parasites, and toxic chemicals. When a power plant first opens or shuts down for repair, fish and other organisms adapted to a particular temperature range can be killed by the abrupt change in water temperature—known as thermal shock.
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Coliform Bacteria Count
Presence indicates that water has been exposed to human or animal waste (contains disease causing agents)
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Dissolved Oxygen
Related to the amount of oxygen-demanding wastes (broken down by oxygen-requiring bacteria & plant nutrients)
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Biological Indicators
Analyze aquatic plants (cattails) or bottom-dwellers (mussels) or filter feeders
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Point Source Pollution
Discharge of pollutants at specific locations through drain pipes, ditches, or sewer lines into surface water Factories Underground mines Sewage treatment plants Oil tankers
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Easy to identify, monitor, & regulate – due to specific location
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Nonpoint Source Pollution
Large or dispersed land areas that discharge pollutants into environment over a large area Acid deposition Runoff from croplands, feedlots for
livestock, logged forests, urban streets, lawns, golf courses, parking lots
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Safe Drinking Water
+ 74-95% of people have access to clean drinking water
- 1.4 billion people do NOT
- 9,300 die daily due to infectious diseases spread by contaminated water or lack of water for adequate hygiene
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Developing Countries
26% of people do not have access to clean drinking water
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Decreased Quality of Surface Water
Intense downpours = more chemicals, plant nutrients, & microorganisms
Massive flooding = spread of disease carrying pathogens into water treatment facilities & wells
Overflow of lagoons & sewer lines = raw sewage into rivers & streams
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Drought = reduced river water to dilute waste
Spread of disease due to lack of water to keep clean
Warm temperatures = lower dissolved oxygen levels = higher growth rates of bateria
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Pollution of Streams
Overloaded with pollutants Drought Damming or water diversion Oxygen sag curve – depletion of DO
by bacteria = reduced populations of organisms with high oxygen requirements
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Clean ZoneDecomposition
Zone
Septic ZoneRecovery
Zone
Clean Zone
Normal clean water organisms(trout, perch, bass,
mayfly, stonefly)
Trash fish(carp, gar,leeches)
Fish absent, fungi,sludge worms,bacteria
(anaerobic)
Trash fish(carp, gar,leeches)
Normal clean water organisms(trout, perch, bass,
mayfly, stonefly)
8 ppmDissolved oxygen (ppm)
Biological oxygendemand
8 ppmTypes of
organisms
Figure 22-5Page 496
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Limiting Factors
Volume of degradable waste Stream volume Flow rate Temperature pH level
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Controlling Stream Pollution in Developed Countries
+ Increased number & quality of water-water treatment plants
+ Industries are required to reduce or eliminate point-source pollution
- Accidental or deliberate release of toxic, inorganic, & organic chemicals causes fish kills & contaminates drinking water
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- Sewage treatment plants malfunction
- Nonpoint runoff of pesticides & excess plant nutrients from cropland & animal feedlots
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Controlling Stream Pollution in Developing Countries
- Discharge of untreated sewage & industrial waste
- Only 10% of Chinese city sewage is treated
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Ganges River Cremated bodies are returned to river
(to increase chances for heaven) Bodies are burned in open air wood
fires Some bodies are dumped into river
only partially burned (decreases DO & adds bacteria & viruses)
Government adding sewage treatment plants & electric crematoriums
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Diluting Lake Pollution
Less effective Stratified layers with little vertical
mixing Little flow – water is replaced every 1-
100 years (unlike days to weeks for streams)
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Eutrophication
Physical, chemical, & biological changes that take place after receiving inputs of plant nutrients (nitrates & phosphates) from natural erosion & runoff
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Cultural Eutrophication
Over nourishment of aquatic ecosystems with plant nutrients due to human activities (agriculture, urbanization, & discharge from industrial plants & sewage treatment plants
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Eutrophication Prevention
Use advances (& expensive) waste treatment systems to remove nitrates & phosphates from waste water
Ban (or limit) use of phosphate in household detergents & other cleaning agents
Soil conservation & land-use control to reduce nutrient runoff
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Eutrophication Cleanup
Mechanically remove excess weeds Control plant growth with herbicides &
algaecides Pump air through lakes & reservoirs to
avoid oxygen depletion
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Lake Washington
Water was diverted into Puget Sound Puget sound has rapid exchange rate
with Pacific Ocean Lake was NOT filled with weeds &
sediment Preventative action
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The Great Lakes
+ Decreased algal blooms
+ Increased DO levels
+ Increased commercial fishing catches
+ New or upgraded sewage treatment plants
+ Better treatment of industrial wastes
+ Ban of phosphate containing cleansers
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- August- low DO levels – kills fish & microorganisms
- ¾ of shoreline is NOT clean enough for swimming
- Nonpoint pollution is still high
- Highly polluted sediments in hot spots
- 80% drop in EPA funded cleanup
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Groundwater Contamination
Leaking from industrial waste ponds (no liners)
Leaking of underground tanks (gasoline, diesel fuel, home heating oil, & toxic solvents)
Leaching of nitrate fertilizers Soils & rock may contain arsenic High levels of naturally occurring
fluoride
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Serious Problems because
Removal can be difficult & costly Slow water movement Pollutants can get easily into drinking
water & irrigation water
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As a Result
High fluoride levels= crippling spine & neck damage & variety of dental problems
High nitrate levels= cancers & “blue baby syndrome” (blood lacks the ability to carry sufficient oxygen)
High arsenic level= cancer (skin, bladder, lung)
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Figure 22-10Page 503
Pump nanoparticles of inorganic compounds to remove pollutants (may be the cheapest, easiest, and most effective method but is still being developed)
Find substitutes for toxic chemicalsKeep toxic chemicals out of the environment
Install monitoring wells nearlandfills and underground tanks
Require leak detectors on underground tanks
Ban hazardous waste disposalin landfills and injection wells
Inject microorganisms to clean up contamination (less expensive but still costly)
Store harmful liquids in aboveground tanks with leak detection and collection systems
Prevention Cleanup
Pump to surface, clean, and return to aquifer (very expensive)
Solutions
Groundwater Pollution
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Ocean Pollution
Coastal areas- dumping of sewage & industrial waste, agricultural waste, algal blooms, oxygen-depleted zones (excessive fertilizers & animal wastes)
40% of world population lives with 100km (62mi) of coast
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Ocean Pollution from Rivers
Plant nutrients from river systems – causes algal blooms (red, brown, green) – releases waterborne & airborne toxins that damage fisheries, kills fish-eating birds, reduces tourism, & poisons seafood
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Chesapeake Bay
Waste from point & nonpoint sources Shallow bay Sewage treatment & industrial plants Runoff from urban, suburban, &
agricultural land Deposition from atmosphere
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Integrated Coastal Management Land-using regulations for agricultural &
urban runoff Ban phosphate detergents Upgrade sewage treatment plants Better monitoring of industrial discharge
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Types of Ocean Pollution
Dredge spoils- materials (toxic metals) scraped from bottoms of harbors & rivers to clear shipping channels
Sewage sludge- gooey mixture of toxic chemicals, infectious agents, & settled solids removed from wastewater at sewage treatment plant
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Ocean Oil Pollution
Waste oil dumped on ground, poured down drain, spilled, or leaked onto land or into sewers by cities, industries, & people changing motor oil
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Oil & Ocean Ecosystem
Kills aquatic organisms (especially larval forms)
Coats bird feather & marine mammal fur (destroys natural insulation & buoyancy)
Smothers bottom-dwellers Kills coral reef Economic impact on coastal residents
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Mechanical Cleanup
Floating booms = contain oil spills from reaching sensitive areas
Skimmer boats = vacuum up oil into collections barges
Absorbent devices = large mesh pillow filled with feathers or hair to soak up oil on beaches
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Chemical Methods
Coagulating agents = cause floating oil to clump together
Dispersing agents = break up oil slicks Fire = can burn off floating oil, but
crude oil is hard to ignite & produces air pollution
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Cleanup Limitations
Can only recover 15% of oil
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Reduced Tanker Oil Spills
Double hulls (by 2015) Trust fund for cleanups Banning of single hull tankersh
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Figure 22-14Page 508 Prevention Cleanup
Ban dumping of wastes and sewage by maritime and cruise ships in coastal waters
Reduce input of toxic pollutants
Separate sewage and storm lines
Regulate coastal development
Recycle used oil
Require double hulls for oil tankers
Require at least secondary treatment of coastal sewage
Use wetlands, solar-aquatic, orother methods to treat sewage
Sprinkle nanoparticles over an oil or sewage spill to dissolve the oil or sewage without creating harmful byproducts(still under development)
Protect sensitive areas from development, oil drilling, and oil shipping
Ban ocean dumping of sludge and hazardous dredged material
Improve oil-spill cleanup capabilities
SolutionsCoastal Water Pollution
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Reducing Nonpoint Source Pollution
Prevent soil erosion by keeping cropland covered with vegetation
Use slow-release fertilizer Apply pesticides only when needed Use buffer zone around animal
feedlots, animal waste sites, & cultivated fields
Use biological controls
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Clean Water Act
Standards for allowed levels of key water pollutants & required polluters to get permits for discharge
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Water Quality Act
Control pollution of surface water
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EPA Discharge Trading Policy
Uses market forces to reduce water pollution
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Septic Tanks
Underground tank for treating wastewater from a home in rural & suburban areas
Bacteria decomposes organic waste Sludge settles to bottom Effluent flows out of tank into ground
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Primary Sewage Treatment
Mechanical sewage treatment where large solids are filtered out by screens & suspended solids settle out as sludge in sedimentation tank
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Secondary Sewage Treatment
2nd step- aerobic bacteria decomposes 90% of degradable, oxygen-demanding organic wastes
Sewage & bacteria is brought together in trickling filters or in activated sludge process
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Householdwastewater
Perforated pipe
Distribution box (optional)
Septic tank with manhole (for cleanout)
Drainfield Vent pipe
Nonperforated pipe
Gravel orcrushedstone
Figure 22-15Page 510
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Raw sewagefrom sewers
Bar screenGritchamber Settling tank Aeration tank Settling tank
Chlorinedisinfection tank
Sludge
Sludge digester
Activated sludge
Air pump
(kills bacteria)
To river, lake,or ocean
Sludge drying bed
Disposed of in landfill orocean or applied to cropland,pasture, or rangeland
Primary Secondary
Figure 22-16 Page 511
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Sludge
Slimy mixture of bacteria-laden solids & toxic chemicals & metals from industrial & household waste
Used to make compost for soil conditioning
Biosolids- used to fertilize farmlands, forests, golf courses, cemeteries, parkland, highway medians, & degraded land
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Sludge as Fertilizer
Must remove harmful bacteria, other pathogens, & toxic chemicals
Removal is expensive & rarely done
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Toxic / Hazardous Waste
Preventing it from reaching sewage treatment plant: Require industries & businesses to
remove toxic & hazardous wastes from waste water
Switch to waterless composting toilet systems
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Wetlands
Sewage goes into sedimentation tanks (solids settle out as sludge)
Liquid is pumped into oxidation ponds where bacteria breaks down remaining wastes
Water released 1 month later into artificial marsh (plants & bacteria carry out further filtration & cleansing)
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Wastewater Garden
Small, low-tech inexpensive artificial wetland
Removes 99.9% of fecal coliform bacteria
Removes 80% of nitrates & phosphates from incoming sewage
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(1) Raw sewage drains by gravity into the first pool and flows through a long perforated PVC pipe into a bed of limestone gravel.
(3) Wastewater flows through another perforated pipe into a second pool, where the same process is repeated.
(2) Microbes in the limestone gravel break down the sewage into chemicals that can be absorbed by the plant roots, and the gravel absorbs phosphorus.
(4) Treated water flowing from the second pool is nearly free of bacteria and plant nutrients. Treated water can be recycled for irrigation and flushing toilets.
45 centimeterlayer of limestonegravel coated with
decomposing bacteriaFirst concrete pool Second concrete pool
Sewage
Wetland typeplants
Wetland typeplants
Treatedwater
Figure 22-18 Page 513
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U.S. Reduction of Water Pollution
+ Increased to 94% of community water systems met federal health standards
+ Fishable/swimmable areas increased to 60%
+ Topsoil loss cut by 1 billion tons
+ Sewage treatment plants increased service to 74%
+ Annual wetland loss decreased to 80%
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- 45% of lakes & 40% of streams were too polluted for fishing or swimming
- Only 19% of streams, 43% of lakes, & 36% of estuaries have been tested for water quality
- 70% of rivers are polluted by animal waste from hog, poultry, & cattle feedlots & meat processing facilities
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- Fish caught in 25% of lakes are unsafe to eat due to pesticides, mercury, or other toxic substances
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Strengthening CWA
Increased funding & authority to control nonpoint sources of pollution
Upgrade computer system for monitoring compliance with the law
Strengthening programs to prevent & control toxic water pollution
More integrated watershed & air shed planning to protect groundwater & surface water from contamination
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Opposition
CWA is too restrictive & costly Curb on right of landowner to fill in
wetlands Landowners want compensation for
property value losses
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Water Purification
Stored in reservoir for several days (increases DO level & suspended matter settles)
Water is pumped to purification plant for filtration & chlorination
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Vulnerability to Terrorist Attacks
Fear of added chemicals or biological agents
Hard to protect due to large numbers of reservoirs, vast network of purification plants & distribution systems, & accessibility of water systems through fire hydrants & service connections
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Purification in Developing Countries
Exposing water in clear plastic bottle to intense sunlight (heat & UV will kill infectious microbes in 3 hrs)
Strips of cloth for filtering cholera-producing bacteria
Add small amount of chlorine-disinfectant solution to plastic or clay storage containers with narrow mouth, cap, & spigot
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Protecting Drinking Water
54 countries have standards for safe drinking water
Safe Water Drinking Act- requires EPA to establish national drinking water standards (maximum contaminant levels) for pollutants with adverse effects on human health
Private wells are exempt
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Success of Efforts
Most of the 54 countries are in North America & Europe
CWA laws do not exist or are not enforces in developing countries
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Strengthening U.S. SDWA
Combine water treatment systems that serve fewer than 3,300 people
Strengthen & enforce public notification requirements about violations of standards
Banning all toxic lead in pipes, faucets, & fixtures
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Weakening SWDA
Eliminate national tests of drinking water & public notification requirements about violations of standards
Give water systems permanent right to violate standards if it cannot afford to comply
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Eliminate requirement that water systems remove cancer-causing contaminants
Reduce EPA budget for enforcing CWA
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Bottled Water
240-10,000X more expensive than tap water
¼ of bottled water is tap water Bacteria contaminates 1/3 Various potentially harmful organic
chemicals contaminate 1/5 1.5 million tons (bottles) trashed
globally
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Manufacturing plastic water bottles releases toxic gases & liquids (greenhouse gases)
+++ Some tap water is too polluted to drink
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Figure 22-19Page 516
Solutions
Water Pollution
•Prevent groundwater contamination
•Greatly reduce nonpoint runoff
•Reuse treated wastewater for irrigation
•Find substitutes for toxic pollutants
•Work with nature to treat sewage
•Practice four R's of resource use (refuse,
reduce, recycle, reuse)
•Reduce resource waste
•Reduce air pollution
•Reduce poverty
•Reduce birth rates
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Figure 22-20Page 516
What Can You Do?
Water Pollution
•Fertilize your garden and yard plants with manure or compost instead of commercial inorganic fertilizer.
•Minimize your use of pesticides.•Never apply fertilizer or pesticides near a body of water.
•Grow or buy organic foods.
•Compost your food wastes.
•Do not use water fresheners in toilets.•Do not flush unwanted medicines down the toilet.
•Do not pour pesticides, paints, solvents, oil, antifreeze, or other products containing harmful chemicals down the drain or onto the ground.