ESD 1212 (UNIT 2 & UNIT 3)

_____ is designed to carry wastewater containing fecal matter from the toilet to the sewer.

• Soil pipe

• Waste pipe

• Vent pipe

Which of the following is the source of gray water?

• Water from toilets

• Water from kitchen sinks

What is scum in a septic tank?

• Heavy organic matter settled at the bottom

• Grease, oils, and light solids floating on top

What is sludge in a septic tank?

• Heavy organic matter settled at the bottom

• Grease, oils, and light solids floating on top

All the following are the physical unit operations, EXCEPT:

• Screening

• Sedimentation

• Filtration

• Disinfection

What is common a coagulant used in wastewater treatment?

• Aluminum sulfate

• Sodium chloride

• Chlorine gas

• Carbon dioxide

What is the primary function of adding chlorine in wastewater treatment?

• To increase pH

• To neutralize acidity

• To disinfect wastewater

• To destabilize colloidal particles

The zone where the untreated wastewater enters the sedimentation tank is called:

• inlet zone

• outlet zone

• sludge zone

• settling zone