Wastewater Treatment

What is the first step in the water treatment process?

• coagulation

• filtration and removal of debris, sand, grit, etc.

• flocs

• concentation

Preliminary treatment

• prevents toxic chemicals.

• removes large objects to prevent damage to equipment.

• is unnecessary.

• is useless.

What is the purpose of using ultraviolet light on the water?

• To bleach it out
• To "sterilize" any bacteria 
• To remove chlorine
• To kill viruses

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-5

What is the role of bacteria in the water purification process?

• digested organic matter
• add chlorine
• nothing, we don't want them in there
• add nutrients to the sludge

What gas must be maintained at precise levels in the aeration tank to maintain aerobic processes?

• CO₂

• O₂

• H₂

• CO

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

What is the first step of preliminary wastewater treatment, which removes large items such as plastic wrappers and sticks?

• screening - employs the use of a "bar screen"

• sedimentation

• aeration

• disinfection

Which method introduces microorganisms to break down hazardous organic compounds?

• Sanitary landfill

• Incineration

• Discharge to sewers, streams, and rivers

• Chemical treatment

• Biological treatment

Bacteria are beneficial to wastewater treatment because

• they naturally break down organic matter
• they help solid material to settle out of the wastewater
• the nutrients produced are beneficial to the treated water
• they aren't beneficial

In which part of the wastewater treatment process are bacteria introduced to the wastewater to feed on organic particles, such as food and feces? (Select 2 choices)

• sedimentation

• aeration

• disinfection

• primary treatment

• secondary treatment

Tags

NGSS.MS-LS2-3

The material that is removed from the wastewater, sent through the belt press and requires proper treatment and disposal methods is called

• sediment

• sludge

• mixed liquor

• aeration