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What is the primary purpose of passing effluent into a settling tank after reducing BOD?
  • a)
    To aerate the water
  • b)
    To allow bacterial flocs to sediment
  • c)
    To cool the water
  • d)
    To add chemicals for disinfection
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
What is the primary purpose of passing effluent into a settling tank a...
The primary purpose of passing effluent into a settling tank is to allow bacterial flocs to sediment, which helps in further purification of the sewage.
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What is the primary purpose of passing effluent into a settling tank a...
Understanding Settling Tanks and BOD Reduction
After reducing Biological Oxygen Demand (BOD) in effluent treatment, the primary purpose of using a settling tank is to facilitate the sedimentation of bacterial flocs. This process is essential for effective wastewater management.
Why Use a Settling Tank?
- Sedimentation Process:
- The settling tank allows for gravity-based separation of solid particles from the liquid effluent.
- The reduced BOD effluent contains bacterial flocs, which are aggregates of bacteria and organic material. These flocs are heavier and can settle when given enough time.
- Removal of Suspended Solids:
- By allowing the effluent to sit in the tank, suspended solids can settle at the bottom.
- This improves the clarity of the water, making subsequent treatment processes more effective.
Benefits of Sedimentation
- Enhanced Efficiency:
- Removing solid particles reduces the load on further treatment processes, such as filtration or disinfection.
- Improved Water Quality:
- Sedimentation leads to cleaner effluent, which is crucial for protecting aquatic ecosystems and complying with environmental regulations.
Conclusion
In summary, the primary purpose of passing effluent into a settling tank after BOD reduction is to allow bacterial flocs to sediment. This process not only removes suspended solids but also enhances the overall efficiency of wastewater treatment, leading to improved water quality.
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