During which phase are solids primarily removed from wastewater?

The phase in which solids are primarily removed from wastewater is the primary treatment phase. This initial stage focuses on the physical removal of larger particles and sediments from the wastewater through processes such as sedimentation and flotation. During primary treatment, wastewater is allowed to sit in large tanks, allowing heavier solids to settle to the bottom and lighter materials to rise to the surface, which can then be skimmed off.

This step is crucial as it significantly reduces the solid load before the wastewater undergoes further biological or chemical treatments in subsequent phases. The removal of these solids helps in minimizing the environmental impact and making the water suitable for further treatment processes.