​Jar test is done to determine which of the following water quality parameters?​

Correct option is D

The Jar test is a laboratory procedure used to determine the optimum coagulant dose needed to remove turbidity from water by coagulation and flocculation processes. It simulates the water treatment process by mixing water samples with different doses of coagulants (like alum) and observing the reduction in turbidity.

The test helps in selecting the correct amount of chemicals to clarify water and remove suspended solids that cause turbidity.

Information Booster:

1. Turbidity refers to the cloudiness or haziness of water caused by suspended particles.

2. The Jar test assesses the effectiveness of coagulants in removing turbidity through settling of flocs.

3. It helps optimize the treatment process, reducing chemical wastage and improving water clarity.

4. pH, BOD (Biochemical Oxygen Demand), and COD (Chemical Oxygen Demand) are measured by different chemical and biological tests.

5. Turbidity reduction improves disinfection efficiency and aesthetic quality of drinking water.

6. Jar tests are commonly used in municipal water treatment plants.

7. Proper turbidity control is essential to prevent pathogen survival in water supplies.

Additional Information:

• (a) pH: Measures acidity/alkalinity, unrelated to Jar test.

• (b) BOD: Indicates organic pollution, measured by oxygen consumption tests.

• (c) COD: Measures total chemical oxidizable matter, assessed chemically.

• (d) Turbidity:  Correct answer; Jar test determines turbidity removal effectiveness.