objectives: describe the types, sources, and effects of freshwater pollutants. evaluate the...
DESCRIPTION
Stream Pollution Flow increases stream recovery Flow reduction and overloadTRANSCRIPT
Objectives:
Describe the types, sources, and effects of freshwater pollutants.
Evaluate the solutions to reduce and prevent water pollution.
Question:
How “clean” is the big Sioux?
Stream Pollution
Flow increases stream recovery
Flow reduction and overload
Oxygen Sag Curve Factors influencing recovery
Fig. 19-5 p. 488
Click to view animation.
Stream Pollution
Stream pollution animation.
Pollution of Lakes
Stratification
Little flow
Small volume
Biomagnification
Cultural Eutrophication
Eutrophication – nutrient enrichment
Nitrate and Phosphate effluents
Algae bloom → death → decomposition
High BOD = low DO
Pollution of Lakes Fig. 19-7 p. 491
Lake Pollution Solutions
Prevention: water treatment, ban/limit phosphates, soil conservation
Cleanup: removing/controlling plants, aeration
Groundwater Pollution
Low flow rates Few bacteria
Cold temperatures
Fig. 19-10 p. 494
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
High-risk human health problem
Groundwater Pollution Prevention Monitoring aquifers Leak detection systems Strictly regulating hazardous waste
disposal
Storing hazardous materials above ground Cleanup?
Better Ask Somebody
Survey says. . .
Better Ask Somebody
Survey says. . .
Objectives:
Describe the types, sources, and effects of freshwater pollutants.
Evaluate the solutions to reduce and prevent water pollution.