Column Settling Tests for Flocculant Suspensions

by Alphonse E. Zanoni, (M.ASCE), Project Mgr.; Environmental Sci. Div., Envirex Inc., Milwaukee, Wisc.,
Marshall W. Blomquist, Sr. Application Engr.; Water Quality Control Div., Envirex Inc., Milwaukee, Wisc.,

Serial Information: Journal of the Environmental Engineering Division, 1975, Vol. 101, Issue 3, Pg. 309-318

Document Type: Journal Paper


The settling of flocculant suspensions can not be described mathematically with the commonly used formulations of Newton and Stokes, because the coalescense of settling particles changes the velocity behavior during the settling trajectory. For this reason batch column settling tests have been employed for basin design or performance evaluation when flocculant suspensions are involved. Forty-eight column settling tests were conducted to evaluate the settling test procedure and for the purpose of recommending a standard batch column settling test.

Subject Headings: Columns | Particle velocity | Mathematics | Settling velocity | Settling basins | Structural behavior

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