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Aerating a Water Treatment Plant

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Questions and Answers

What is the purpose of aerating a water treatment plant?

To accelerate the settling of grit in the water

To add oxygen to the water as organic matter decays (correct)

To release dissolved gases like hydrogen sulfide

To increase the concentration of volatile gases in the water

How does aeration help in water treatment?

By causing grit to dissolve in the water

By increasing the concentration of dissolved carbon dioxide

By promoting the settling of 'grit' (correct)

By preventing the release of volatile gases

What is the role of scrubbing action in aeration?

Add hydrogen sulfide to the water solution

Remove dissolved gases like carbon dioxide from water (correct)

Promote the growth of organic compounds

Increase the odor of the water

How is oxidation used in water treatment?

Adding electrons to impurities like iron and manganese Signup and view all the answers

What happens to heavy floc particles during sedimentation in a water treatment plant?

They settle to the bottom of tanks Signup and view all the answers

Why is sludge collected at the bottom of sedimentation tanks?

To be piped to drying lagoons Signup and view all the answers

What is the main function of the mechanical sludge scraping devices in circular and rectangular tanks?

To remove settled wet sludge Signup and view all the answers

In which type of tank is the main sludge removal from the top of the sludge basket?

Radial flow tank Signup and view all the answers

What is the purpose of removing lighter materials such as grease, oils, plastics, and soap from sludge?

To separate organic matter Signup and view all the answers

Which method is used to remove bacteria, reduce turbidity, and remove most solid particles from liquid sewage?

Filtration Signup and view all the answers

What does a circular radial-flow tank typically consist of?

Inlet zone, settling zone, outlet zone, and sludge zone Signup and view all the answers

What is the main function of filtering liquid sewage through sand by gravity in sewage treatment?

To remove organic matter Signup and view all the answers