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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.
Explain the different steps involved during primary treatment phase of sewage.
Explain the process of secondary treatment given to the primary effluent up to the point it shows significant change in the level of biological oxygen demand (BOD) it.
Explain the function of “anaerobic sludge digester” in a sewage treatment plant.
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?
What is primary treatment of sewage?
Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?
Removal of large pieces of floating debris, oily substances, etc. during sewage treatment is called _______________.
Why is this sewage water treatment essential?
Name the chamber in which the suspended objects are filtered and removed during sewage treatment?
Small part of activated sludge is passed back into primary sedimentation tank.
If the above statement is correct then rewrite as it is and in case it is incorrect then reframe it.
Rearrange the names of tanks used in sewage treatment as per the flow of the procedure.
- Settling tank
- Grit Chamber
- Aeration tanks
- Primary sedimentation tank.
After which of the following process effluents from anaerobic sludge digesters are released in natural water bodies?
In the process of biogas production which of the following anaerobic bacteria are used?
Small part of activated sludge is passed back into ______ and major part is pumped into large tanks called ______.
Why do we prefer to call secondary waste water treatment as biological treatment?
Study the given diagram of the Sewage Treatment Plant (S.T.P.) and answer the question that follows:
- Which one of the two 'S.T.P.' (A) or (B) will be more effective in treating the human excreta in municipal waste?
- Write the steps followed in carrying the treatment of the sewage in step (Z), once the BOD of sewage is reduced significantly till it is passed on to the "anaerobic sludge digesters".
Given below is the flowchart of sewage treatment. Identify A, B, C, D and E and select the correct option.
After a significant reduction in the BOD of wastewater, it is passed into a settling tank where bacterial flocs are allowed to sediment. This sediment is called ______.
Removal of suspended, floating, coarse and solid particles in sewage treatment is called ______.
What is the major component of municipal wastewater (sewage)?
During primary sewage treatment, floating debris is separated by which physical process?
In a sewage treatment plant, grit comprising soil and small pebbles is removed during which stage and process?
Which action plans were initiated by the Ministry of Environment and Forests to construct sewage treatment plants and protect major Indian rivers from pollution?
Approximately what percentage of suspended solids is removed during primary sedimentation in a sewage treatment plant?
