Question
Arrange the following sludge treatment unit operations and processes in chronological order :
A. Conditioning
B. Dewatering
C. Concentration
D. Digestion
E. Incineration
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
C, D, A, B, E
Sludge Treatment Process Chronology
The chronological order of sludge treatment unit operations involves sequential steps to reduce sludge volume, stabilize solids, and prepare for final disposal. Analyzing the typical sequence:
- Concentration (C): This initial step, often involving thickening, aims to reduce the sludge volume by removing a portion of the liquid.
- Digestion (D): Following concentration, digestion processes (like anaerobic or aerobic digestion) stabilize the organic matter in the sludge, reducing solids and pathogens.
- Conditioning (A): Sludge is often conditioned using chemicals or heat treatment to alter its physical state, making it easier to dewater. This step prepares the sludge for mechanical water removal.
- Dewatering (B): Mechanical processes such as centrifugation, belt filtration, or vacuum filtration are employed to remove more water from the conditioned sludge.
- Incineration (E): This is a final disposal method where sludge is burned at high temperatures, significantly reducing its volume and destroying harmful organisms. It typically follows dewatering.
Therefore, the correct chronological order is Concentration, Digestion, Conditioning, Dewatering, and Incineration.
Correct Order Breakdown
- C. Concentration
- D. Digestion
- A. Conditioning
- B. Dewatering
- E. Incineration
This corresponds to the sequence C, D, A, B, E.
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