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During waste water treatment, large objects like plastic bottles, plastics, and cans are removed by:
1. Bar screen
2. Filtration
3. Aeration
4. Chlorination

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Correct Answer - Option 1 : Bar screen

The correct answer is bar screen.

  • The wastewater entering the sewage plant first passes through the bar screen.
  • The bar screen removes big rubbish like plastic bottles, sanitary napkins, cans, plastic bags, Sticks, etc.

  • Wastewater management
    • Wastewater treatment is a process used to remove contaminants and make the water usable.
      • Wastewater Collection
      • Screening
      • Primary Treatment
      • Secondary Treatment
      • Final Treatment
      • Screening
  • Screening is one of the first stages in the process of treating wastewater.
    • In this process, the larger objects are removed from wastewater and then moved into the grit and sand removal tank.
  • Primary treatment
    • Wastewater after the screening is taken for primary treatment where all the organic waste is removed.
    • Primary treatment is done by pouring the wastewater into big tanks for the solid matter to settle at the surface of the tanks.
  • Secondary treatment
    • Water after primary treatment is passed through a tank called ‘aeration lane’’ where the air is tapped into the water to increase the growth of aerobic bacteria.
    • Bacteria break down small particles of sludge that escaped after primary treatment.
  • Final treatment
    • The activated sludge is passed through a bed of sand drying machine where the sludge is dried up and water is filtered out.
    • The water is directed to flow over a wall wherein it gets filtered through the sand bed to eliminate additional particles if any.
    • This water that is filtered is then released into the river.

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