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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
Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?
In the process of biogas production which of the following anaerobic bacteria are used?
Which of the following occurs during secondary treatment?
Identify the INCORRECT statement with respect to sewage treatment.
What happens during the course of sewage decomposition?
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.
Wastewater treatment generates a large quantity of sludge, which can be treated by ______.
What would happen if oxygen availability to activated sludge flocs is reduced?
In what way anaerobic sludge digestion is important in sewage treatments?
Explain the steps involved in preliminary treatment of sewage.
