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Question

Arrange the given processes involved in a correct sequence that is followed in a waste water treatment plant.

A
Screening
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B
Grit removal
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C
Sedimentation
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D
Disinfection
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Solution

The correct option is
Wastewater treatment is the process of removing harmful contaminants from water. The steps involved in water treatment process are as follows-
Wastewater treatment starts with screening where heavier wastes like plastic bags, wood pieces are removed.
In second step of grit removal, particles like sand, grit and pebbles are removed.
Next step is primary sedimentation, it includes settling of primary sludge and the removal of wastewater from the top of sedimentation tank.
The wastewater is then treated with aerobic bacteria where waste is decomposed and forms activated sludge. This is followed by secondary sedimentation.
Finally, it is treated with chemicals like chlorine or ozone to disinfect water before releasing water to natural waterbodies.

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