Sedimentation of a Flocculated Slurry

Monitoring sedimentation of a clay slurry

K. Klein, University of Toronto J. C. Santamarina, Georgia Institute of Technology The authors measured resistivity at various depths during the sedimentation of kaolinite in different ionic concentration fluids. They attributed a decreasing resistivity (increasing conductivity) with time in the low ionic concentration fluids to decreasing tortuosity. The authors suggested that the initial stru...

A Model of Continuous Sedimentation of Flocculated Suspensions in Clarifier-Thickener Units

The chief purpose of this paper is to formulate and partly analyze a new mathematical model for continuous sedimentation-consolidation processes of flocculated suspensions in clarifierthickener units. This model appears in two variants for cylindrical and variable cross-sectional area units, respectively (Models 1 and 2). In both cases, the governing equation is a scalar, strongly degenerate pa...

Non-Newtonian behaviour of flocculated suspensions

Biodegradation Modeling of Nitrophenolic Pollutant in a Slurry Bubble Reactor

Biodegradation kinetics of 4-nitrophenol (PNP) in aqueous solution by a gram negative soil bacterium, Ralstoniaeutropha was firstly studied in a small scale batch reactor. The degradation of PNP was evaluated at initial PNP concentrations ranging from 3 mg/L to 14 mg/L. The rate of PNP consumption by the bacterium culture was modeled using Monod and Contois kinetics in batch condition. PNP degr...

Laboratory apparatus for collection of flocculated vegetative bacterial cells.

Recent observations by Hodge and Metcalfe (1957) have demonstrated the ability of a number of hydrophilic colloids to flocculate cells of various bacterial species. Flocculation of the cells occurred by a mechanism previously proposed by Michaels (1954); namely, adsorption of the flocculant on the hydrated surface of the colloid particle, and a bridging between the suspended particles. In gener...