McLaughlin, Ronald T. (1958) On the mechanics of sedimentation in artificial basins. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-02022006-084546
A theoretical and experimental study was made of the quiescent settling of the particles of a suspension in order to determine what governs the removal of particles when the suspension passes through a sedimentation basin. Settling column experiments were performed in tubes ranging from one foot to four feet in depth. Glass spheres in water, alum and clay in water, and Pasadena sewage were used as suspensions. While the suspensions settled in the columns, samples were withdrawn at time intervals at several depths. These were analyzed for concentration of suspended particles.
It was found that for free, quiescent settling of discrete particles, the removal of particles can be calculated in advance if the frequency distribution of particle settling velocities and the particle concentration are known as functions of position in the suspension at the beginning of settling.
For a suspension of flocculent particles it was almost impossible to predict removal without measuring the settling properties of each individual suspension. There is no single universal property of a settling tank with which removal is correlated. It was found that while for some flocculent suspensions removal may be strongly dependent upon detention time, no strong dependence on overflow rate was indicated.
Since so many suspensions encountered in settling tanks have flocculent particles, the kinetics of flocculation was studied qualitatively by theory and experiment.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Engineering and Applied Science|
|Major Option:||Civil Engineering|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 January 1958|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||06 Feb 2006|
|Last Modified:||26 Dec 2012 02:29|
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