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प्रश्न
Explain the function of “anaerobic sludge digester” in a sewage treatment plant.
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उत्तर
An anaerobic sludge digester is a large tank where the anaerobic bacteria digest the bacteria and fungi in the sludge and produce a mixture of gases such as methane, H2S and CO2.
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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?
Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.
Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?
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?
Which of the following occurs during tertiary treatment?
Which of the following is/are found in discharge from industrial waste?
Identify the INCORRECT statement with respect to sewage treatment.
Study the following statements regarding tertiary treatment of sewage and choose the correct option.
i. It produces methane gas.
ii. The effluents formed from these plants undergo chlorination.
iii. BOD is significantly increased at this step.
iv. It includes screening and passage of effluent through grit chamber.
The primary treatment of waste water involves the removal of ______.
