Which of the following is not a method of monitoring coagulation, flocculation, and sedimentation?

Colloid size analysis is not typically considered a method for monitoring coagulation, flocculation, and sedimentation processes in water treatment. This process generally focuses on the physical and chemical interactions that lead to the aggregation of suspended particles and their subsequent removal from water.

In contrast, methods like the jar test are fundamental laboratory procedures used to simulate the treatment process by determining the optimal dosages of coagulants and assessing the effectiveness of the coagulation process. Direct monitoring involves real-time assessments of water quality parameters that can indicate how well coagulation and sedimentation are performing. The volume over volume test may also relate to measuring the effectiveness of floc formation and settling efficiency.

By understanding these methods, one can appreciate why colloid size analysis, which primarily focuses on the physical characteristics of suspended particles, does not directly assess the performance of coagulation and sedimentation in a water treatment context.