What is the consequence of a high coagulant dose being used?

Using a high coagulant dose can lead to poor sedimentation, which is primarily due to the excessive amount of coagulant altering the balance of particle interaction and floc formation. When too much coagulant is introduced into the water treatment process, the result can often be smaller, denser flocs that do not settle out effectively. Instead of forming larger, more buoyant flocs that settle quickly, the overabundance of coagulants can hinder the floc aggregation process, making it more challenging for the flocs to settle at the desired rate.

This negatively impacts the overall sedimentation process, leading to inadequate removal of suspended solids and ultimately compromising water quality. In contrast, optimal coagulant dosing promotes the formation of larger floc aggregates that can settle efficiently, facilitating better removal of contaminants during the treatment process. Instances of high coagulant doses may also lead to operational challenges such as increased sludge production and difficulties in managing the treatment system. Therefore, the consequence of using a high coagulant dose primarily aligns with poor sedimentation outcomes.