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प्रश्न
What is the key difference between primary and secondary sewage treatment?
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उत्तर
| Sr. No. |
Aspect |
Primary Sewage Treatment | Secondary Sewage Treatment |
| 1. | Nature of Process | Primary sewage treatment is a purely physical process of wastewater purification. | Secondary sewage treatment is a biological process driven by living microorganisms. |
| 2. | Target Material | This treatment focuses on removing floating debris and solid particles, such as grit. | This treatment focuses on degrading the dissolved organic matter in the water. |
| 3. | Mechanism | It achieves purification through sequential filtration and gravitational sedimentation. | It achieves purification using aerobic microbes that form mesh-like structures called flocs. |
| 4. | Impact on BOD | This stage causes little to no reduction in the Biochemical Oxygen Demand of sewage. | This stage significantly reduces the Biochemical Oxygen Demand of the effluent. |
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संबंधित प्रश्न
Explain the role of microbes in sewage treatment.
Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20 mg/L, 8 mg/L and 400 mg/L, respectively. Which sample of the water is most polluted? Can you assign the correct label to each, assuming the river water is relatively clean?
Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.
One of the free-living anaerobic nitrogen-fixer is _________.
Why is this sewage water treatment essential?
Name the chamber in which the suspended objects are filtered and removed during sewage treatment?
Name the tank to which the sewage water is passed after the preliminary treatment?
Which of the following is TRUE about primary treatment?
Which of the following occurs during secondary treatment?
Identify the type of microorganisms involved in floe formation during sewage treatment.
After which of the following treatment BOD of the effluent is significantly reduced?
Which of the following is TRUE regarding 'Flocs'?
Which of the following is put into Anaerobic sludge disaster for further sewage treatment?
Methanogenic bacteria are not found in ______.
In a sewage treatment plant, all of the following processes belong to secondary treatment except:
In which of the following step large and small particles are removed from sewage through sequential filtration and sedimentation?
The primary treatment of waste water involves the removal of ______.
What would happen if oxygen availability to activated sludge flocs is reduced?
Why do we prefer to call secondary waste water treatment as biological treatment?
Why are flocs important in biological treatment of waste water?
Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.
What would happen if a large volume of untreated sewage is discharged into a river?
Given below is the flowchart of sewage treatment. Identify A, B, C, D and E and select the correct option.
The aeration tank of a sewage treatment plant is not functioning properly. Explain in detail the impact of this on the treatment of sewage and BOD of the effluent.
Removal of suspended, floating, coarse and solid particles in sewage treatment is called ______.
