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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
Explain the function of “anaerobic sludge digester” in a sewage treatment plant.
Explain the process of sewage water treatment before it can be discharged into natural water bodies.
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?
Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.
Which of the following process is a part of preliminary treatment of sewage?
BOD of waste water is estimated by measuring the amount of ______.
Why is aerobic degradation more important than anaerobic degradation for the treatment of large volumes of waste waters rich in organic matter. Discuss.
Removal of suspended, floating, coarse and solid particles in sewage treatment is called ______.
Biochemical Oxygen Demand (BOD) serves as an indirect measure of which water quality parameter?
Which bacterium is an example of a methanogen commonly found in anaerobic sludge during sewage treatment?
