What is the primary function of a sedimentation basin in water treatment?

• A. To disinfect water
• B. To filter contaminants
• C. To settle particles from water
• D. To introduce chemicals

Answer: (C)

The primary function of a sedimentation basin in water treatment is to settle particles from water. This process involves allowing the water to remain still for a period, which enables heavier particles, such as silt, sand, and sediments, to sink to the bottom of the basin due to gravity. This step is crucial in the water treatment process as it helps remove suspended solids from the water, leading to clearer water that subsequently undergoes further treatment processes, such as filtration and disinfection.

This settling process is vital for improving water quality and is often one of the first steps in water treatment facilities. By effectively removing these particles, sedimentation basins reduce the load on subsequent treatment processes, making them more efficient and effective in producing safe drinking water.