Water Treatment

What is the first step in the water treatment process?

• coagulation
• filtration
• 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 was the name of the brown wastewater solution in the aeration tank?

• sludge
• effluent
• mixed liquor
• sewage

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

• sedimentation

• aeration

• disinfection

List the following steps of Water purification in the correct order

Step P: Water is passed through a screen to remove debris.

Step Q: Pathogenic organisms are killed by chlorination, UV, or ozone.

Step R: Suspended particles clump and settle out.

Step S: A flocking agent, such as alum, is added to the water.

• P, Q, R, S

• S, P, R, Q

• P, S, R, Q

• R, P, S, Q

• S, R, P, Q