What is the purpose of adding flocculating agents in water treatment?

Adding flocculating agents in water treatment primarily serves to enhance the sedimentation process. These agents facilitate the aggregation of fine particles and contaminants suspended in water, forming larger clusters or "flocs." As these flocs increase in size, they become heavier and are more easily removed from the water through settling.

The effectiveness of flocculation is critical for the clarification of water in treatment processes. By promoting the gathering and settling of smaller particles, the overall quality of water improves, as more contaminants are effectively removed, leading to cleaner water.

The other options do not align with the role of flocculating agents. Increasing acidity, decreasing water temperature, or removing dissolved oxygen do not relate to the primary functions of flocculation, which focuses specifically on improving the efficiency of the sedimentation process in water treatment.