Which of the following is NOT a main component of a wastewater treatment facility?

The primary components of a wastewater treatment facility are designed to process and treat wastewater effectively before it is released back into the environment. Screens are used to remove larger solids and debris from the wastewater. Aeration tanks are fundamental for oxygenating the wastewater to support the microorganisms that break down organic matter during the biological treatment phase. Sludge treatment systems are necessary for handling the byproducts of the treatment process, specifically the sludge that settles out during sedimentation.

Desalination units, on the other hand, are not typically a component of wastewater treatment facilities. They are instead designed for removing salt and other impurities from seawater or brackish water to produce fresh water. While desalination is important in regions facing water scarcity, it is a separate process focused on transforming saline water into potable water rather than processing wastewater. Hence, it does not belong to the primary components you would find in a traditional wastewater treatment facility.