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प्रश्न
Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.
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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
Distinguish between the roles of flocs and anaerobic sludge digesters in sewage treatments.
Name the tank to which the sewage water is passed after the preliminary treatment?
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.
Which of the following process is a part of preliminary treatment of sewage?
Which of the following is TRUE regarding 'Flocs'?
During sewage, treatment biogas is produced wits which include:
Wastewater treatment generates a large quantity of sludge, which can be treated by ______.
Name the states involved in Ganga action plan.
Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.
