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प्रश्न
Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.
उत्तर
After the primary treatment, the primary effluent is taken for secondary treatment where it is passed into large aeration tanks and is constantly agitated and air is pumped into it. This leads to the vigorous growth of useful aerobic microbes into flocs. Flocs are masses of bacteria associated with fungal filaments to form mesh like structures. These microbes in the flocs consume the major part of the organic matter in the effluent and reduces the BOD (biological oxygen demand) of the effluent. Less BOD means that the waste water is less polluted.
After this, the effluent is passed into a settling tank where the flocs are allowed to settle and this sediment is called activated sludge. A small part of the activated sludge is pumped back to serve as the inoculum. Inoculum is the small amount of a material containing microbes that can start a new culture. This way same microbial culture is recycled and reused to start a new culture for the treatment.
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संबंधित प्रश्न
Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?
One of the free-living anaerobic nitrogen-fixer is _________.
Which of the following is/are found in discharge from industrial waste?
Identify the type of microorganisms involved in floe formation during sewage treatment.
______ refers to the organic matter which settles down after physical treatment of sewage.
Which of the following process is a part of preliminary treatment of sewage?
The primary treatment of waste water involves the removal of ______.
What would happen if oxygen availability to activated sludge flocs is reduced?
Why do we prefer to call secondary waste water treatment as biological treatment?
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.
