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प्रश्न
Distinguish between the roles of flocs and anaerobic sludge digesters in sewage treatments.
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उत्तर
Flocs contain aerobic microbes that grow in aeration tank during secondary treatment of effluent and consume a major part of the organic matter of the effluent.
In anaerobic sludge digester, anaerobic type of bacteria grow and digest the rest of the organic compounds and produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide (biogas).
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संबंधित प्रश्न
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?
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 treatment BOD of the effluent is significantly reduced?
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.
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.
Biochemical Oxygen Demand (BOD) may not be good index for pollution for water bodies receiving effluents from ______.
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 ______.
