Multiple choice

Match the column - I with column – II and select the correct option

 
Column – I Column – II
A. Removal of solids 1. Primary treatment
B. Degradation of biological content 2. Secondary treatment
C. Disinfection of the wastewater 3. Tertiary treatment

  1. A - 1, B - 2, C - 3

  2. A - 1, B - 3, C - 2

  3. A - 2, B - 1, C - 3

  4. A - 2, B - 3, C - 1

  5. A - 3, B - 2, C - 1
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A Correct answer
Explanation

Primary treatment usually includes the removal of large solids from the waste water via physical settling or filtration. Secondary treatment typically removes the smaller solids and particles remaining in the waste water through fine filtration aided by the use of membranes or substantially degrade the biological content of the sewage which is derived from human waste, food waste, soaps and detergent through the use of microbes. Tertiary treatment involves the disinfection of the wastewater through chemical or energetic means.

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