Question:
Which one of the following is an objective of Primary waste water treatment?
Which one of the following is an objective of Primary waste water treatment?
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Remember that primary treatment is a physical gravity-separation process, whereas secondary treatment is a biochemical/microbial process.
Updated On: Jul 10, 2026
- Removal of settleable organic and inorganic solids by sedimentation.
- Removal of coarse solids.
- Removal of large objects.
- Removal of organic matter by biological treatment.
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Wastewater treatment is divided into preliminary, primary, secondary, and tertiary stages.
Step 2: Detailed Explanation:
- Preliminary treatment: Focuses on physical screening to remove large objects (C) and coarse solids (B).
- Primary treatment: Involves physical settling, where gravity removes settleable organic and inorganic suspended solids in primary clarifiers or sedimentation tanks (A).
- Secondary treatment: Uses biological processes (D) (like activated sludge) to degrade dissolved organic matter.
Step 3: Final Answer:
Therefore, the objective of primary wastewater treatment is the removal of settleable organic and inorganic solids by sedimentation.
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