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Question

Which of the following describes the correct sequence for treatment of wastewater in a wastewater treatment plant?

A
Chemical → biological → physical
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B
Biological → physical → chemical
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C
Physical → biological → chemical
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D
Biological → chemical → physical
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Solution

The correct option is C Physical → biological → chemical
Wastewater treatment is the process of removing harmful contaminants from water. Physical, chemical and biological processes are used to treat wastewater.
  • Wastewater treatment starts with screening and is followed by removal of sand and grit which are physical processes.
  • It is then followed by biological processes where wastes in water are decomposed by bacteria.
  • Finally, it is treated with chemicals like chlorine and ozone to disinfect the water before it is released into natural waterbodies.
  • Hence, correct sequence for treatment of wastewater in a wastewater treatment plant is physical, biological and then chemical.

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