Wastewater Treatment

What is the first step in the water treatment process?

• coagulation

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

• flocs

• concentation

What word means the solid particles that have settled out during the sedimentation process.

• sediment
• solubility
• settlement
• solidifying

Preliminary treatment

• prevents toxic chemicals.

• removes large objects.

• is unnecessary.

• is useless.

Tags

NGSS.MS-PS1-2

Which substance is used in a sewage treatment system to kill harmful bacteria?

• ammonia

• chlorine

• sand

• soap

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-ESS3-4

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?

• CO₂
• O₂
• H₂
• CO

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

Tags

NGSS.HS-LS2-7

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

Tags

NGSS.MS-LS2-3