Question:
The ratio of primary to secondary sludge is generally
The ratio of primary to secondary sludge is generally
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Primary sludge: 60-70% of total suspended solids removed.
Secondary sludge: Biological solids from aeration tank.
Sludge processing: Thickening, digestion, dewatering, disposal.
Secondary sludge: Biological solids from aeration tank.
Sludge processing: Thickening, digestion, dewatering, disposal.
Updated On: Aug 25, 2026
- 1:1
- 2:1
- 2:1:1
- 2:2:1
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
This question tests knowledge of wastewater treatment and sludge production.
Step 2: Detailed Explanation:
Primary sludge: Settled solids from primary sedimentation tanks.
Secondary sludge: Biological solids from secondary treatment (activated sludge process).
The ratio of primary to secondary sludge is generally 1:1.
This is a typical ratio in municipal wastewater treatment plants.
Other ratios:
- 2:1 (B): Not typical.
- 2:1:1 (C): Not applicable.
- 2:2:1 (D): Not applicable.
Thus, the primary to secondary sludge ratio is 1:1.
Step 3: Final Answer:
Thus, the ratio of primary to secondary sludge is generally 1:1.
[0.5cm]
This question tests knowledge of wastewater treatment and sludge production.
Step 2: Detailed Explanation:
Primary sludge: Settled solids from primary sedimentation tanks.
Secondary sludge: Biological solids from secondary treatment (activated sludge process).
The ratio of primary to secondary sludge is generally 1:1.
This is a typical ratio in municipal wastewater treatment plants.
Other ratios:
- 2:1 (B): Not typical.
- 2:1:1 (C): Not applicable.
- 2:2:1 (D): Not applicable.
Thus, the primary to secondary sludge ratio is 1:1.
Step 3: Final Answer:
Thus, the ratio of primary to secondary sludge is generally 1:1.
[0.5cm]
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