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Which of the following are physical means of purifying water ? I. decantation II. chlorination III. filtration IV. sedimentation Select the correct answer using the codes given below.

Which of the following are physical means of purifying water ? I. decantation II. chlorination III. filtration IV. sedimentation Select the correct answer using the codes given below. Correct Answer I, III and IV

Purifying water includes the methods of physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination; and the use of electromagnetic radiation such as ultraviolet light.

Important Points

Decantation Water chlorination Filtration Sedimentation

Decantation is a process to separate mixtures by removing a liquid layer that is free of a precipitate, or the solids deposited from a solution.

Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.

This method is used to kill bacteria, viruses, and other microbes in water.

Filtration is a process used to separate solids from liquids or gases using a filter medium that allows the fluid to pass through but not the solid.

The fluid that passes through the filter is called the filtrate.

The process of settling or being deposited as sediment.

Sedimentation is the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity.
The purpose may be to obtain a decent (liquid free from particulates) or to recover the precipitate In particular, chlorination is used to prevent the spread of waterborne diseases such as cholera, dysentery, and typhoid. The term "filtration" applies whether the filter is mechanical, biological, or physical. The particles that settle out from the suspension become sediment, and in water treatment is known as sludge.

 

Hence, we may say that only chlorination is not a physical means of purifying or filtration. but Decantation, Sedimentation, and Filtration are physical means of purifying water.

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