Laboratory Experiments on Electroosmotic Dewatering of Vegetable Sludge and Mine Tailings

Chen, H.; Mujumdar, Arun S.; Ragbaran, G.S.V.

doi:10.1080/07373939608917215

Cited by 39 publications

(24 citation statements)

References 3 publications

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“…The output as a function of time increases when (11) (11) 0 F P + < . It is recalled that (11) 0 F > and (11) 0 P < .…”

Section: Modelling Conceptsmentioning

confidence: 99%

“…Similarly, (11) F and (22) F are never zero: the influx of ions into the pores must be proportional to the available concentration in the free flowing pool. It is also easily verified that (11) P and (22) P are both negative and that (11) F and (22) F are both positive. They need not be exact opposites as the probability of an ion migrating into the pore is most likely not equal to the probability of one escaping from it.…”

Section: Modelling Conceptsmentioning

confidence: 99%

“…Some preliminary observations may be made. The coefficients (11) P and (22) P are never zero: the out-flux of ions from the pores must be proportional to the available concentration. Similarly, (11) F and (22) F are never zero: the influx of ions into the pores must be proportional to the available concentration in the free flowing pool.…”

Section: Modelling Conceptsmentioning

confidence: 99%

“…The coefficients (11) P and (22) P are never zero: the out-flux of ions from the pores must be proportional to the available concentration. Similarly, (11) F and (22) F are never zero: the influx of ions into the pores must be proportional to the available concentration in the free flowing pool. It is also easily verified that (11) P and (22) P are both negative and that (11) F and (22) F are both positive.…”

Section: Modelling Conceptsmentioning

confidence: 99%

“…Although only slight increases in the kinetics of washing have been reported 2 , the situation can be quite different when the removal of specific ions is measured 3 . Electro-osmotic flow of ions in porous systems under the action of an electrical field is of practical interest for soil stabilisation 4 , contaminated soil remediation [5][6][7][8][9] the dewatering of tailings ponds 10,11 and the dewatering of sewage sludge [12][13][14][15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

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Transport processes during electrowashing of filter cakes

Kilchherr

Koenders

Wakeman

et al. 2004

Chemical Engineering Science

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Applications of electric fields during washing of filter cakes increases the removal rate of ions from the cake mother liquor, and under appropriate conditions the field also increases the wash flow rate by electroosmosis. Experimental data that show the key effects of the fields on the rates of ion mass transfer are presented: with the downstream electrode acting as a cathode, cation removal rates are increased whilst the removal rate of the anions is decreased. The concentration profile of the cations with washing time shows an increase in concentration to a value above that of the mother liquor, before it decreases due to displacement by the fresh wash liquor. A model is formulated that describes the advection, dispersion, ion migration and electroosmosis transport processes in the cake. Numerical solution of the model gives cation concentration profiles at the exit of the cake that are in qualitative agreement with the experimental observations. Experimentally measured wash liquor flow rates tend to be lower than what traditional colloid science principles predict by a factor of 5 to 10: reasons for this difference, supported by experimental work from other researchers, are discussed.

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“…The output as a function of time increases when (11) (11) 0 F P + < . It is recalled that (11) 0 F > and (11) 0 P < .…”

Section: Modelling Conceptsmentioning

confidence: 99%