OneWater Practice Exam

The main idea here is how coagulants help remove suspended particles by destabilizing them and forming larger aggregates. Coagulants neutralize or compress the electrical charges on particle surfaces, reducing repulsion so particles can come together. When the repulsion is lowered, mixing or natural motion lets particles collide more easily. Those collisions lead to the growth of larger aggregates, or flocs, which can then settle out or be filtered. Among the statements, reducing repulsion is a true benefit because it directly enables particle aggregation. Allowing particles to collide is also a benefit, since collisions are the mechanism that starts the flocculation process. Creating flocs is the end result of successful collisions and destabilization, making removal via sedimentation or filtration possible. Increasing color stability, however, is not a benefit of using coagulants. Coagulation is used to remove color-causing substances by forming flocs that are then removed, which typically reduces color, not stabilizes it.