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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.
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
Name the tank to which the sewage water is passed after the preliminary 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.
Which of the following is/are found in discharge from industrial waste?
Into which of the following the sewage water is pumped after preliminary treatment?
Identify the type of microorganisms involved in floe formation during sewage treatment.
Study the following statements regarding tertiary treatment of sewage and choose the correct option.
i. It produces methane gas.
ii. The effluents formed from these plants undergo chlorination.
iii. BOD is significantly increased at this step.
iv. It includes screening and passage of effluent through grit chamber.
After which of the following treatment BOD of the effluent is significantly reduced?
In the process of sewage treatment, the activated sludge is digested by ______
What would happen if a large volume of untreated sewage is discharged into a river?
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 ______.
