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प्रश्न
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.
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उत्तर
- It will adversely affect the secondary treatment or biological treatment of sewage.
- When the aeration tank is not functional, the air will not be pumped into it.
- This will not allow the vigorous growth of useful aerobic microbes into flocs (masses of bacteria associated with fungal filaments to form mesh-like structures).
- Thus, the major part of the organic matter in the effluent will not be consumed by these bacteria.
- The BOD (biochemical oxygen demand) of the effluent will not be reduced. BOD refers to the amount of oxygen that would be consumed if all the organic matter in one litre of water were oxidised by bacteria.
- The greater the BOD of wastewater, the more its polluting potential. Thus, the effluent will remain polluted with a high amount of organic matter and high BOD.
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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?
One of the free-living anaerobic nitrogen-fixer is _________.
What happens during the course of sewage decomposition?
During tertiary treatment, the bacterial floes sediment in the sedimentation tank, this sediment is called ____________.
Which of the following process is a part of preliminary treatment of sewage?
BOD of waste water is estimated by measuring the amount of ______.
What would happen if a large volume of untreated sewage is discharged into a river?
Biochemical Oxygen Demand (BOD) may not be good index for pollution for water bodies receiving effluents from ______.
Which of the following statement is correct for Sewage Treatment Plants (STPs)?
Removal of suspended, floating, coarse and solid particles in sewage treatment is called ______.
