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प्रश्न
What is sewage?
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उत्तर
Sewage is a collective term for municipal wastewater, which includes both liquid and solid wastes produced in cities and towns and transported via sewers. Chemically, sewage consists of approximately 99% water and 1% solid waste, which may be organic or inorganic in nature. Sewage typically contains bacteria (e.g., coliforms, streptococci, clostridia, lactobacilli), microfungi, protozoa and microalgae.
संबंधित प्रश्न
Explain the different steps involved during primary treatment phase of sewage.
Explain the function of “anaerobic sludge digester” in a sewage treatment plant.
Distinguish between the roles of flocs and anaerobic sludge digesters in sewage treatments.
What is the key difference between primary and secondary sewage treatment?
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?
What is primary treatment of sewage?
Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?
Answer the following question.
Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process.
One of the free-living anaerobic nitrogen-fixer is _________.
The purpose of biological treatment of waste water is to ______.
Due to which of the following reason/s sewage water cannot be discharged directly into river?
After which of the following process effluents from anaerobic sludge digesters are released in natural water bodies?
Which of the following is/are found in discharge from industrial waste?
Which of the following occurs during secondary treatment?
Into which of the following the sewage water is pumped after preliminary treatment?
Activated sludge should have the ability to settle quickly so that it can ______.
Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.
Which one is wrongly matched?
