Sludge Volume Index in Wastewater Treatment Quiz

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Sludge Volume Index In Wastewater Treatment Quiz

A critical parameter used to evaluate the settling characteristics of activated sludge in wastewater treatment.

Minutes: 10:00

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1. What does SVI stand for in wastewater treatment?

A) Suspended Volume Index

B) Sludge Volume Index

C) Solids Volume Indicator

D) Settling Volume Index

2. What is the unit of Sludge Volume Index (SVI)?

A) m³/g

B) mg/L

C) mL/g

D) kg/m³

3. How is SVI calculated?

A) Settled sludge volume / Total volume

B) MLSS / Settled sludge volume

C) Settled sludge volume (mL/L) / MLSS (g/L)

D) MLSS (mg/L) / Settled sludge volume (mL)

4. What does a high SVI (>150 mL/g) typically indicate?

A) Good settling sludge

B) High solids concentration

C) Sludge bulking

D) Low oxygen levels

5. What is the standard settling time for SVI measurement?

A) 15 minutes

B) 30 minutes

C) 1 hour

D) 10 minutes

6. What is the desirable range for SVI in a healthy activated sludge system?

A) 10–30 mL/g

B) 30–60 mL/g

C) 80–120 mL/g

D) 150–200 mL/g

7. Which factor does NOT directly affect SVI?

A) Temperature

B) Dissolved oxygen

C) pH

D) Nitrate concentration

8. What does MLSS stand for?

A) Mixed Liquid Solids Settle

B) Mixed Liquor Suspended Solids

C) Maximum Limit of Settling Solids

D) Mixed Liquor Solids Stream

9. What could a very low SVI (<50 mL/g) indicate?

A) Sludge bulking

B) Pin floc or sludge flotation

C) Excellent sludge settling

D) Septic conditions

10. A plant has an MLSS of 3,000 mg/L and a settled sludge volume of 300 mL. What is the SVI?

A) 100 mL/g

B) 10 mL/g

C) 300 mL/g

D) 90 mL/g

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