Which statement best describes the purpose of pretreatment before discharge to a municipal wastewater plant?

Which statement best describes the purpose of pretreatment before discharge to a municipal wastewater plant?

• A. It reduces pollutants that could harm biological treatment processes, such as heavy metals and oil/grease.
• B. It eliminates all pollutants from the wastewater.
• C. It eliminates the need for municipal treatment.
• D. It only reduces odor.

Answer: (A)