APES Unit 8 Review Exam Questions and Answers
Level of dissolved oxygen(DO) - -depleted by oxygen demanding wastes
-BOD - -Biochemical oxygen demand
-Oxygen sag curve - -The breakdown of degradable wastes by bacteria depletes dissolved
oxygen
this reduces and eliminates populations and organisms with high oxygen requirements
until the stream is cleansed with waste
-In most developed countries, large fish kills and contamination of drinking water may be
caused by all of the following - --malfunctioning sewage treatment plants
- accidental release of toxic industrial chemicals
- deliberate release of toxic industrial chemicals
- pesticides and plant nutrients from agricultural sources
-cultural eutrophication - -the input of plant nutrients to a lake from human activity
-these sources include runoff from farmland, fertilizer, urban areas, feedlots and mining
sites
-cultural eutrophication prevention - --use advanced waste treatment to remove
phosphates nitrates(expensive)
-limit the use of phosphates in household detergents and other cleaning supplies
-employ soil conservation and land-use control to control nutrient runoff
-groundwater contamination sources - --pesticides and fertilizer
-buried gasoline and solvent tanks
-cesspool septic tanks
-polluted air
-hazardous waste injection wells
-sewers
-leaking pipes
-road salt
-coal strip mine runoff
-landfills
-effects of an oil spill depend on - -amount and location
-leading nonpoint source of water pollution - -runoff from fertilizer po
-farmers can reduce fertilizer runoff by - -- using slow-release fertilizers
-keeping cropland covered with vegetation
-planting buffer zones between cultivated lands and water
Level of dissolved oxygen(DO) - -depleted by oxygen demanding wastes
-BOD - -Biochemical oxygen demand
-Oxygen sag curve - -The breakdown of degradable wastes by bacteria depletes dissolved
oxygen
this reduces and eliminates populations and organisms with high oxygen requirements
until the stream is cleansed with waste
-In most developed countries, large fish kills and contamination of drinking water may be
caused by all of the following - --malfunctioning sewage treatment plants
- accidental release of toxic industrial chemicals
- deliberate release of toxic industrial chemicals
- pesticides and plant nutrients from agricultural sources
-cultural eutrophication - -the input of plant nutrients to a lake from human activity
-these sources include runoff from farmland, fertilizer, urban areas, feedlots and mining
sites
-cultural eutrophication prevention - --use advanced waste treatment to remove
phosphates nitrates(expensive)
-limit the use of phosphates in household detergents and other cleaning supplies
-employ soil conservation and land-use control to control nutrient runoff
-groundwater contamination sources - --pesticides and fertilizer
-buried gasoline and solvent tanks
-cesspool septic tanks
-polluted air
-hazardous waste injection wells
-sewers
-leaking pipes
-road salt
-coal strip mine runoff
-landfills
-effects of an oil spill depend on - -amount and location
-leading nonpoint source of water pollution - -runoff from fertilizer po
-farmers can reduce fertilizer runoff by - -- using slow-release fertilizers
-keeping cropland covered with vegetation
-planting buffer zones between cultivated lands and water
