Question

which of the following is not the step involved in primary treatment of wastewater?options are:a sedimentation b grit removal c UV sedimentation d chemical treatment

Answer 1

d chemical treatment is not involved in primary treatment of wastewater

Answer 2

The correct option is (d). Chemical treatment.

• The goal of primary treatment is to remove floatable physical and chemical particles by centrifugation and to eliminate large floating physical and chemical solids by sweeping.
• In the primary wastewaters, filtering and deposition are used to remove smaller and larger particles (solid Crystalline particles) from the waste.
• These are eliminated first by successive filtration, which eliminates pieces of debris, and now by deposition, which separates sand.

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