What technique is often employed to increase the removal of particulates during sedimentation?

Coagulation is a critical process used to enhance the removal of particulates during sedimentation in water treatment. This technique involves adding coagulants, such as aluminum sulfate or ferric chloride, to the water. These chemicals facilitate the aggregation of small particles, creating larger flocs that can settle more easily.

By neutralizing the charges on suspended particles, coagulation allows them to clump together, forming a denser mass. This increases the efficiency of sedimentation, as the larger flocs are more likely to sink quickly, reducing the turbidity of the water and improving overall water quality.

While mechanical mixing may help distribute the coagulants and promote flocculation, it does not directly enhance sedimentation. Similarly, rapid filtration and disinfection focus on other aspects of water quality and do not primarily address the removal of particulates through sedimentation processes. Hence, coagulation stands out as the most effective technique specifically aimed at increasing the removal of particulates during sedimentation.