In this paper we studied the particle size and distribution (PSD) character during conventional water treatment process. By measuring the particle size and distribution of raw-water, settled water and filtered water, we developed a log-log model between particle diameter and amount, which can be described as ln n=−β ln Dp+K. The value of collision frequency factor β in the PSD log-log model can represent the particles' dynamic behavior, and can provide a foundation to choose a more suitable coagulation mode in accelerating particles aggregation. At the same time, we deduced the relationship ln V=bK+C between the value of parameter K and the total particles volume V. Lots of experiments proved the conclusion's validity. K is defined as particle volume exponent, which can represent the total volume of particles. K's degression degree shows the removal efficiency of potable water treatment units.

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