Water Quality and Treatment Slides

A small city gets its drinking water from the river running through its center. This river is fed by rivers that flow down the mountains nearby.How would excessive rainfall in the mountains most likely affect the turbidity of this local water source?

• A. Heavy rainfall would decrease the turbidity of the river downstream.

• B. Heavy rainfall would increase the turbidity of the river downstream.

• C. Heavy rainfall would increase the turbidity of only rivers upstream.

• D. Heavy rainfall would decrease the turbidity of only rivers upstream.

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Which will occur if humans continue to overload water systems with excess nutrients?

• A. chemosynthesis

• B. eutrophication

• C. nitrification

• D. photosynthesis

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Which process would most likely increase the dissolved oxygen level in a freshwater lake?

• A. algae bloom

• B. lake turnover

• C. photosynthesis

• D. respiration

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Which is the best example of a point source pollution?

• A. runoff from fields

• B. pesticides sprayed into the air

• C. oil spill from a boat in the Atlantic Ocean

• D. smoke from multiple industries in a large city

The Environmental Protection Agency was assigned with which task?

• setting standards and governing the cleanliness of water used by Americans

• setting standards and governing the highways and interstates in the United States

• setting standards and governing the use of national parks and monuments in the United States

• setting standards and governing the civil and commercial air transportation in the United States.

Cholera is a bacterial disease that is spread throughout a community by contaminated water. How can the spread of cholera (bacteria) be prevented?

• by giving healthy people antibiotics before they get sick

• by hand washing with contaminated water before food preparation

• by using Chlorine to treat water before it enters the water supply

• by using waste to fertilize fields instead of releasing it into the water supply

Which human activity has the most negative impact on water quality?

• washing clothes

• recreational boating

• flushing toilets

• agriculture

Which is the most important reason for maintaining clean water?

• Goods cannot be transported easily without water

• Energy cannot be generated without water

• People cannot maintain proper hygiene without water

• Organisms cannot live and grow without water

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Which steps in the water-treatment process use positively charged chemicals to balance negatively charged sediment, leading to the formation of larger particles when these oppositely charged particles combine?

• sedimentation and coagulation

• disinfection and sedimentation

• coagulation and flocculation

• disinfection and flocculation

What does a pH of 7 most likely indicate about the water quality?

• The water is a strong base

• The water is highly acidic

• The water is toxic to drink

• The water is safe to drink