What is the purpose of a rapid mix in coagulation and what parameters are typically controlled there?

• A. To remove solids by filtration; parameters: flow rate and pressure.
• B. To neutralize acids after coagulation; parameters: pH.
• C. To aid floc buildup by slow mixing; parameters: time.
• D. To achieve homogeneous chemical mixing; parameters: mixing intensity, contact time, temperature.

Answer: (D)