Wastewater can be made potable and usable by employing

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BPSC AE Paper 4 (General Engineering Science) 10 Nov 2022 Official Paper
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  1. filtration and sedimentation as chemical methods for purification
  2. sedimentation as physical method and oxidising agent like chlorine or ozone as chemical method for purification
  3. screening and skimming as biological methods for purification
  4. physical methods such as aerobic and anaerobic processes for purification

Answer (Detailed Solution Below)

Option 2 : sedimentation as physical method and oxidising agent like chlorine or ozone as chemical method for purification
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Detailed Solution

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Explanation:
Sedimentation:

  • It is a physical method that allows heavier particles to settle at the bottom, separating them from the water. It is commonly used as a primary treatment step in wastewater treatment.

Oxidizing Agents:

  • Like chlorine and ozone are chemical methods used to disinfect water, effectively killing bacteria, viruses, and other pathogens, making the water potable.

Additional Information

  • Filtration and sedimentation are physical methods, not chemical methods.
  • Screening and skimming are physical methods, not biological methods.
  • Aerobic and anaerobic processes are biological methods, not physical methods.
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