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The domestic sewage in large cities :

  • Option 1)

    is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)

  • Option 2)

    When treated in STPs does not really require the aeration step as the sewage contains adequate oxygen.

  • Option 3)

    has very high amounts of suspended solids and dissolved salts

  • Option 4)

    has a high BOD as it contains both aerobic and anaerobic bacteria

 

Answers (1)

 

Water Pollutants -

The common water pollutants are Domestic sewage, Industrial effluents, Pesticides,  Herbicides, Fertilizers, Bacteria and Viruses, Plankton blooms and Heavy metals like Mercury, Temperature, Silt, Radioactivity, Oils etc.

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Causes of water pollution -

Domestic sewage

- wherein

Domestic sewage consists of human faces, urine, and the dirty used–up water in houses. It contains a large number of bacteria and virus. The sewage is released into the rivers on the banks of which most of the cities are situated.

 

 

 

 


Option 1)

is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)

Correct option

Option 2)

When treated in STPs does not really require the aeration step as the sewage contains adequate oxygen.

Incorrect option

Option 3)

has very high amounts of suspended solids and dissolved salts

Incorrect option

Option 4)

has a high BOD as it contains both aerobic and anaerobic bacteria

Incorrect option

Posted by

Vakul

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