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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 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 process of sewage water treatment before it can be discharged into natural water bodies.
Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?
One of the free-living anaerobic nitrogen-fixer is _________.
Name the chamber in which the suspended objects are filtered and removed during sewage treatment?
What are flocs with respect to sewage treatment?
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.
Which of the following is TRUE about primary treatment?
After which of the following process effluents from anaerobic sludge digesters are released in natural water bodies?
Small part of activated sludge is passed back into ______ and major part is pumped into large tanks called ______.
Which of the following occurs during secondary treatment?
Into which of the following the sewage water is pumped after preliminary treatment?
What happens during the course of sewage decomposition?
Nitrogen fixation by organisms requires conditions that are:
In a sewage treatment plant, all of the following processes belong to secondary treatment except:
Wastewater treatment generates a large quantity of sludge, which can be treated by ______.
The primary treatment of waste water involves the removal of ______.
Name the states involved in Ganga action plan.
What is the group of bacteria found in both the rumen of cattle and shidge of sewage treatment?
Why is aerobic degradation more important than anaerobic degradation for the treatment of large volumes of waste waters rich in organic matter. Discuss.
Discuss about the major programs that the Ministry of Environment and Forests, Government of India, has initiated for saving major Indian rivers from pollution.
What would happen if a large volume of untreated sewage is discharged into a river?
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".
Biochemical Oxygen Demand (BOD) may not be good index for pollution for water bodies receiving effluents from ______.
