What are two common chemical dosing steps in wastewater treatment and their purpose?

• A. Adding acid to lower pH and increase color
• B. No chemical dosing used
• C. Alkali dosing to raise pH and improve coagulation, and coagulant/flocculant dosing (e.g., alum or polymers) to enhance solids removal and settling
• D. Adding sugar to feed bacteria

Answer: (C)