Sample interview questions: Can you explain the process of water treatment and the various stages involved?
Sample answer:
Process of Water Treatment and Stages Involved
Water treatment involves purifying raw water to make it suitable for human consumption, industrial use, or environmental discharge. It typically consists of several stages:
1. Coagulant Dosing and Flocculation:
* Chemicals (coagulants) are added to destabilize suspended particles in raw water.
* Rapid mixing promotes particle collisions, forming microflocs.
* Slow stirring allows these microflocs to aggregate into larger flocs.
2. Sedimentation:
* Flocs settle out under gravity in sedimentation basins.
* Most suspended solids and some microorganisms are removed.
3. Filtration:
* Flocculated water passes through porous media (e.g., sand, gravel) to trap remaining particles.
* Filtration removes turbidity, residual solids, and bacteria.
4. Disinfection:
* Chlorine (or other disinfectants) are added to kill pathogenic microorganisms.
* Disinfection times and residual chlorine levels are monitored to ensure adequate … Read full answer
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