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प्रश्न
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.
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उत्तर
The effluent from the primary treatment is passed to aeration tanks where air is pumped into it. The useful aerobic microbes grow into flocs (masses of bacteria associated with fungal filaments) and consume the major part of the organic matter in the effluent which reduces BOD of the effluent. The effluent is then passed into a settling tank where bacterial flocs are allowed to sediment. This sediment is called activated sludge.
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संबंधित प्रश्न
Answer the following question.
What are 'flocs', formed during secondary treatment of sewage?
Name the tank to which the sewage water is passed after the preliminary treatment?
______ refers to the organic matter which settles down after physical treatment of sewage.
Nitrogen fixation by organisms requires conditions that are:
Which of the following is put into Anaerobic sludge disaster for further sewage treatment?
In which of the following step large and small particles are removed from sewage through sequential filtration and sedimentation?
Wastewater treatment generates a large quantity of sludge, which can be treated by ______.
Why do we prefer to call secondary waste water treatment as biological treatment?
Why is aerobic degradation more important than anaerobic degradation for the treatment of large volumes of waste waters rich in organic matter. Discuss.
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".
