Water Science & Technology: Water Supply–WSTWS Vol 8 No 1 pp 25–30 © IWA Publishing 2008 doi:10.2166/ws.2008.001

Research on micro-particles distribution character in water treatment processes

Liu Guangqi, Kong Yanhong, Jiang Lihui and Xu Yongpeng

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=-b ln D_p+K. The value of collision frequency factor b 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.

Keywords: micro-particles; particle size distribution (PSD); particles collision frequency factor b; particle volume exponent K

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