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  • (a) What would happen if a large volume of untreated sewage is discharged into a river.

(a) What would happen if a large volume of untreated sewage is discharged into a river?

(b) In what way anaerobic sludge digestion is important in sewage treatments?

Answers (1)

(a) Following are the harmful effects of untreated sewage being discharged into a river:

  1. It will contaminate water, making it unfit for drinking.
  2.  It will alter the pH level of water, which can be detrimental to aquatic plants and animals.
  3.  This will also pollute groundwater.
  4.  Fish from contaminated water will become unfit for human consumption.

 

 (b) Anaerobic sludge digestion is important from the following angles:

 (i) It helps in the production of biogas which can be used as fuel. Biogas from sewage treatment plants is being used for electricity generation at many places in the world.

 (ii) The slurry can be used as manure. This will help in improving soil fertility.

 (iii) This also helps in reducing soil pollution and water pollution.

Posted by

Gurleen Kaur

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