What is the first step in the removal of suspended solids?

The first step in the removal of suspended solids is sedimentation. This process involves allowing the water containing suspended particles to sit undisturbed for a certain period. During this time, the heavier particles will settle to the bottom of the sedimentation basin due to gravity, effectively reducing the total number of suspended solids in the water.

While other methods like coagulation and flocculation are also important in the treatment process, they typically occur before sedimentation. Coagulation involves adding chemicals to promote the aggregation of fine particles, and flocculation follows, where those aggregates are further encouraged to form larger clumps (or flocs) that can settle more efficiently. However, sedimentation is a crucial step that allows the heavier particulates to detach from the water column, making it the initial action taken to address suspended solids in water treatment operations.