Advertisements
Advertisements
Question
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.
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Explain the function of “anaerobic sludge digester” in a sewage treatment plant.
Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.
Removal of large pieces of floating debris, oily substances, etc. during sewage treatment is called _______________.
Name the tank to which the sewage water is passed after the preliminary treatment?
Due to which of the following reason/s sewage water cannot be discharged directly into river?
In a sewage treatment plant, all of the following processes belong to secondary treatment except:
Activated sludge should have the ability to settle quickly so that it can ______.
After a significant reduction in the BOD of wastewater, it is passed into a settling tank where bacterial flocs are allowed to sediment. This sediment is called ______.
Explain the steps involved in preliminary treatment of sewage.
Removal of suspended, floating, coarse and solid particles in sewage treatment is called ______.
