Structure of hydroxide flocs

François, R.J.; Haute, A.A. Van

doi:10.1016/0043-1354(85)90178-2

Cited by 26 publications

(10 citation statements)

References 17 publications

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“…[8], and the fluid collection efficiency, h (Eq. [9]), are plotted as functions of the fractal dimension of the aggregate for different non-dimensional ag-(for Brownian diffusion), [18a] gregate sizes (a/a p ). For highly porous aggregates (low fractal dimensions), V is low, indicating the low resistance the fluid where k is the Boltzmann's constant, T is temperature, d is the diameter of the aggregate, and i and j are the size classes within which another floc or particle should approach for aggregation to occur and hence should be equal to the outer radius of the aggregates.…”

Section: Hydrodynamics Of a Porous Aggregatementioning

confidence: 99%

Hydrodynamics of Fractal Aggregates with Radially Varying Permeability

Veerapaneni

Wiesner

1996

Journal of Colloid and Interface Science

239

212

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Section: Hydrodynamics Of a Porous Aggregatementioning

confidence: 99%

Hydrodynamics of Fractal Aggregates with Radially Varying Permeability

Veerapaneni

Wiesner

1996

Journal of Colloid and Interface Science

239

212

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“…So hydrated MnO 2 , as a kind of flocculation cores, strengthened the coagulation efficacy. Because the size of hydrated MnO 2 was relatively small, the crevice between particles forming big flocculating constituents decreased relatively, flocculating constituents effective density increased relatively, stability of flocculating constituents increased [10] .…”

Section: Analysis Of Aid-coagulation Process With Hydrated Mnomentioning

confidence: 98%

Micro Analysis of Efficacy and Mechanism of Aid-Coagulation with Hydrated MnO2

Nan

2009

2009 International Conference on Energy and Environment Technology

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The coagulation experiment, with Kaolin and humic acids (nature organics) as objects, aluminum chloride (PAC) as coagulant and hydrated MnO 2 as coagulant aid, were accomplished under different conditions. In the experiment, the particle size distribution, turbidity and streaming current (SCD) in water were detected by on-line detector. Then the variation rules of particle size distribution and SCD for the microscopic efficacy and mechanism of aid-coagulation with hydrated MnO 2 was analyzed. The results shows that a low dosage of hydrated MnO 2 (0.01~0.02 mmol/L) can lead to a good aid-coagulation efficacy after precipitation, reducing total particle counts, <5 μm particle counts and turbidity effectually, adding stability of flocculating constituents and decreasing the counts of small particles releasing again. Hydrated MnO 2 could strengthen adsorption bridging action. In coagulation process, hydrated MnO 2 particle could adsorb small particles to its surface, then aggregate into bigger one.

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“…This scheme corresponds to a concept of multilevel structure of flocs, which describes formation of aggregates according to scheme (Gorczyca and Ganczarczyk, 1999;Francois and van Haute, 1985):…”

Section: Effect Of Mixing On Suspension Qualitymentioning

confidence: 99%

A Method for Evaluation of Suspension Quality Easy Applicable To Practice: The Effect of Mixing on Floc Properties

Ebubakova¹,

Pivokonský²,

Pivokonská³

2011

Journal of Hydrology and Hydromechanics

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The paper introduces the test of aggregation as a simple, inexpensive method of evaluating suspension quality during drinking water treatment, suitable for use in both laboratory and operation conditions. The procedure and derivation of the aggregation test is described. The method is used for a demonstration of the influence of mean velocity gradient and mixing time on floc properties formed during the aggregation in a Couette reactor. It was proved that with increasing velocity gradient, the size of the aggregates present in the suspension decreases, and the suspension is substantially more homogeneous than with use of lower gradients. Further, it was confirmed that the size of aggregates reaches the steady state after a specific mixing time, which becomes shorter with increasing value of velocity gradient. Příspěvek představuje test agregace jako jednoduchou a levnou metodu stanovení kvality suspenze při úpravě vody vhodnou pro použití v laboratorních i provozních podmínkách. Je popsán metodický postup i odvození testu agregace. Metoda je použita pro hodnocení vlivu středního gradientu rychlosti a doby mí-chání na vlastnosti vytvářených agregátů (vloček) při agregaci v Couettově reaktoru. Bylo prokázáno, že se vzrůstajícím gradientem se snižuje velikost agregátů přítomných v suspenzi a suspenze je značně více homogenní než při použití nízkých gradientů rychlosti. Dále bylo potvrzeno, že velikost agregátů dosahuje po určité době míchání stabilní hodnoty. Čas pro dosažení tohoto ustáleného stavu se zkracuje s rostoucí hodnotou použitého gradientu.KLÍČOVÁ SLOVA: agregace, flokulace, test agregace, úprava pitné vody, vlastnosti agregátů.

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Structure of hydroxide flocs

Cited by 26 publications

References 17 publications

Hydrodynamics of Fractal Aggregates with Radially Varying Permeability

Hydrodynamics of Fractal Aggregates with Radially Varying Permeability

Micro Analysis of Efficacy and Mechanism of Aid-Coagulation with Hydrated MnO2

A Method for Evaluation of Suspension Quality Easy Applicable To Practice: The Effect of Mixing on Floc Properties

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