Advertisements
Advertisements
प्रश्न
Answer the following question.
What are 'flocs', formed during secondary treatment of sewage?
Advertisements
उत्तर
Flocs are masses of bacteria embedded in fungal filaments to form a mesh-like structure.
These flocs consume organic matter in wastewater and reduce the B.O.D. levels in the water. The flocs form a part of activated sludge, a small part of which is pumped back into aeration tank to help as inoculums.
APPEARS IN
संबंधित प्रश्न
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?
One of the free-living anaerobic nitrogen-fixer is _________.
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?
Wastewater treatment generates a large quantity of sludge, which can be treated by ______.
Name the states involved in Ganga action plan.
Biochemical Oxygen Demand (BOD) serves as an indirect measure of which water quality parameter?
Which mixture of gases is collectively produced as biogas during anaerobic sludge digestion?
What is the primary composition of municipal sewage by mass?
By what percentage does the decomposition of organic matter by aerobic bacteria in aeration tanks typically lower the BOD during secondary treatment?
