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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
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?
Why is this sewage water treatment essential?
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?
After which of the following process effluents from anaerobic sludge digesters are released in natural water bodies?
Which of the following occurs during tertiary treatment?
Into which of the following the sewage water is pumped after preliminary treatment?
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.
During sewage, treatment biogas is produced wits which include:
In which of the following step large and small particles are removed from sewage through sequential filtration and sedimentation?
What would happen if oxygen availability to activated sludge flocs is reduced?
Why do we prefer to call secondary waste water treatment as biological treatment?
Discuss about the major programs that the Ministry of Environment and Forests, Government of India, has initiated for saving major Indian rivers from pollution.
Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.
Given below is the flowchart of sewage treatment. Identify A, B, C, D and E and select the correct option.
Biochemical Oxygen Demand (BOD) may not be good index for pollution for water bodies receiving effluents from ______.
Explain the steps involved in preliminary treatment of sewage.
