Question:

The domestic sewage in large cities

Updated On: Jul 29, 2022
  • has a high BOD as it contains both aerobic and bacteria
  • is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)
  • when treated in STPs does not really require the aeration step as the sewage contains adequate oxygen
  • has very high amounts of suspended solids and dissolved salts
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The Correct Option is B

Solution and Explanation

Sewage is wastewater having food residue, animals and human excreta, detergents, discharges from commercial and industrial establishments. The domestic sewage is processed first by aerobic and then by anaerobic bacteria in Secondary Treatment Plants (STPs).
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Concepts Used:

Water Pollution

  • Water pollution means the contamination of water bodies such as seas, lakes, rivers, aquifers, oceans, and groundwater caused majorly due to inhuman activities with industrial and agricultural effluents. It is the change of chemical, biological, or physical properties of water that will result in a destructive consequence for living organisms.
  • Portable water is considered safe for human and animal consumption as well as used for drinking, cooking, crop irrigation, washing, etc,. Nowadays, chemicals, bacteria, and other pollutants are also influencing this. It adversely acts on all the living forms, directly or indirectly depending upon the source. The effects of water pollution can be felt for years to come.

Sources of Water Pollution:

The following are the major sources of Water Pollution:

  • Domestic Waste
  • Urbanization
  • Deforestation
  • Industrial effluents
  • Social and Religious Practices
  • Insecticides and pesticides
  • Detergents and Fertilizers