Wastewater, Including Sewage Usually Undergoes Several Treatments at a Sewage

Multiple Choice

Wastewater, including sewage usually undergoes several treatments at a sewage treatment plant. Match the treatment with the process for expected outcome.

A) primary treatment: eliminating inorganic and organic compounds by aerating and circulating the wastewater.
B) tertiary treatment: biologically decomposing suspended organic material.
C) secondary treatment: reducing phosphorus and nitrogen levels with a filtering system.
D) primary treatment: removing suspended and floating particles by mechanical processes.