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.