Sample interview questions: Can you explain the concept of coagulation and flocculation in water treatment and their impact on water quality?
Sample answer:
Coagulation and Flocculation in Water Treatment
Coagulation
- The process of destabilizing suspended particles in water by neutralizing their electrical charges.
- Typically achieved using metal salts, such as aluminum or iron salts.
- The positive ions from the metal salts neutralize the negative charges on the particles, reducing electrostatic repulsion.
Flocculation
- The process of aggregating destabilized particles into larger, settleable flocs.
- Achieved by gently mixing the coagulated water, allowing the smaller flocs to collide and form larger ones.
- May involve the addition of polymer flocculants to enhance floc formation.
Impact on Water Quality
- Improved Clarity: Coagulation and flocculation remove suspended solids, resulting in clearer water.
- Reduced Turbidity: Suspended solids scatter light, increasing turbidity. Coagulation and flocculation reduce turbidity, allowing for better light penetration and improved aesthetics.
- Enhanced Disinfection: Particles can harbor microorganisms, making them more difficult to disinfect. Removing particles improves disinfection efficiency,… Read full answer
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