Question
Choose the correct order of sequence for modern sewage treatment :
A. Primary sedimentation
B. Screening
C. Grit removal
D. Sludge Disposal
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
B, C, A, D
Sewage Treatment Sequence Explained
Understanding the sequence of modern sewage treatment is crucial. The process generally involves removing solids progressively, from largest to smallest, before handling the resulting sludge.
- Screening (B): This is the initial step where large objects like rags, grit, and other debris are removed from the raw sewage using screens or bar racks.
- Grit Removal (C): Following screening, grit chambers are used to remove heavier inorganic materials such as sand, gravel, and eggshells, which could otherwise damage pumps and clog pipes.
- Primary Sedimentation (A): In this stage, sewage flows slowly through large tanks (primary clarifiers) allowing settleable organic solids to settle to the bottom as sludge, and lighter materials like oil and grease to float to the surface.
- Sludge Disposal (D): The sludge collected from sedimentation tanks (and subsequent treatment stages) requires proper treatment and disposal, which is the final phase concerning the removed solids.
Therefore, the correct order for these stages in modern sewage treatment is Screening (B), followed by Grit Removal (C), then Primary Sedimentation (A), and finally Sludge Disposal (D).
This sequence is represented by B, C, A, D.
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