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प्रश्न
What is primary treatment of sewage?
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उत्तर
Filtration and sedimentation [Physical process] to remove floating debris and heavy particles respectively are primary treatment of sewage.
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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?
Answer the following question.
Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process.
Name the chamber in which the suspended objects are filtered and removed during sewage treatment?
Due to which of the following reason/s sewage water cannot be discharged directly into river?
Small part of activated sludge is passed back into ______ and major part is pumped into large tanks called ______.
Wastewater treatment generates a large quantity of sludge, which can be treated by ______.
BOD of waste water is estimated by measuring the amount of ______.
What is the group of bacteria found in both the rumen of cattle and shidge of sewage treatment?
Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.
Which one is wrongly matched?
