What is the main function of flocculation after coagulant addition in water treatment?
Correct answer: D. Gently agitating water to form larger flocs
- A. Mixing water violently to break particles
- B. Heating water to destroy microorganisms
- C. Adding oxygen to oxidize organic matter
- D. Gently agitating water to form larger flocs
Explanation
Flocculation uses gentle mixing so destabilized particles collide and form larger, settleable flocs. Violent mixing can break these flocs and reduce settling performance.
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About Environmental Engineering
Environmental engineering examines water supply, water quality, treatment processes, wastewater collection and treatment, solid waste management, air pollution and public health protection. It covers sedimentation, coagulation, filtration, disinfection, biological treatment and disposal methods, while distinguishing drinking-water treatment from sewage treatment and BOD from COD.
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