Which statement best describes the relationship between coagulation and floc formation?

Which statement best describes the relationship between coagulation and floc formation?

• A. Coagulation causes small particles to clump into floc that settles more readily.
• B. Coagulation forms single particles that remain suspended.
• C. Coagulation removes dissolved salts.
• D. Coagulation directly disinfects water.

Answer: (A)

Coagulation neutralizes the charges on tiny particles, making them unstable and able to come together. When these destabilized particles are stirred gently, they collide and bond to form larger aggregates called flocs. Those flocs are big enough to settle out in a sedimentation stage or be caught by filters. So coagulation sets the stage for floc formation, and the resulting flocs settle more readily than the original small particles. Coagulation isn’t about removing dissolved salts or disinfecting water—those are separate steps in the treatment process.

Coagulation neutralizes the charges on tiny particles, making them unstable and able to come together. When these destabilized particles are stirred gently, they collide and bond to form larger aggregates called flocs. Those flocs are big enough to settle out in a sedimentation stage or be caught by filters. So coagulation sets the stage for floc formation, and the resulting flocs settle more readily than the original small particles. Coagulation isn’t about removing dissolved salts or disinfecting water—those are separate steps in the treatment process.