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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.
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
What is primary treatment of sewage?
Removal of large pieces of floating debris, oily substances, etc. during sewage treatment is called _______________.
What are flocs with respect to sewage 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.
Small part of activated sludge is passed back into ______ and major part is pumped into large tanks called ______.
Identify the type of microorganisms involved in floe formation during sewage treatment.
The primary treatment of waste water involves the removal of ______.
Activated sludge should have the ability to settle quickly so that it can ______.
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".
Explain the steps involved in preliminary treatment of sewage.
