The various treatment processes in a water treatment plant are as follows :

1. Filtration

2. Chlorination

3. Sedimentation

4. Coagulation

5. Flocculation

The correct sequence of these processes in water treatment is

Explanation:

Sequence of Water Treatment Processes

Water treatment involves a series of processes to remove impurities and make it safe for consumption. The correct sequence ensures optimal removal of contaminants and effective purification.

• Coagulation: Chemicals are added to destabilize particles and cause them to clump together.

• Flocculation: Gentle mixing encourages clumped particles to form larger aggregates called flocs.

• Sedimentation: Flocs settle at the bottom of the tank, separating from the water.

• Filtration: Remaining impurities are removed by passing water through filter beds.

• Chlorination: Chlorine is added to kill pathogens and disinfect the water.

Analyzing the Given Options

1. Option 1: 1, 2, 3, 4, 5

   • This sequence starts with filtration, which is incorrect since coagulation and flocculation must precede filtration.

   • Hence, this option is incorrect.

2. Option 2: 4, 5, 3, 1, 2

   • This sequence correctly starts with coagulation and flocculation, followed by sedimentation, filtration, and chlorination.

   • Hence, this option is correct.

3. Option 3: 2, 3, 1, 5, 4

   • This sequence starts with chlorination, which is incorrect as it should be the final step.

   • Hence, this option is incorrect.

4. Option 4: 1, 2, 5, 3, 4

   • This sequence starts with filtration, which is incorrect since coagulation must precede filtration.

   • Hence, this option is incorrect.

Conclusion:

The correct sequence of water treatment processes is Option 2: 4, 5, 3, 1, 2.