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2 edition of effect of flow conditions on the stability of flocs found in the catalog.

effect of flow conditions on the stability of flocs

Andrew Geoffrey Rushton

effect of flow conditions on the stability of flocs

by Andrew Geoffrey Rushton

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Published .
Written in English


Edition Notes

Thesis(Ph.D.)- Loughborough University of Technology.

Statementby A.G. Rushton.
ID Numbers
Open LibraryOL13941763M

A novel capillary flow device to tests floc stability has been designed and manufactured, and tested at CMST. This is a substantial improvement that will help operators of direct filtration plants to better manage high colour-low turbidity events by being able to determine floc strength under different coagulation conditions. flocs (very small flocs), bulking sludge (caused by growth of filamentous and/or Zoogloea bacteria), rising sludge (N2-bubbles formed due to denitrification stick to flocs and lift them to the surface) and foaming. Activated sludge flocs are then carried out with the effluent.

The frictional force exerted by the flow per unit area of the bed is the shear stress (turbulent shear stress during turbulent flow conditions). The efficiency with which the particles flocculate is a reflection of the stability of the suspension (van Leussen, ).Cited by: 9. Formation of flocs is ‘flocculation’. But the flocs tend to settle in a honeycomb structure, in which in place of each grain, a floc occurs. Thus, grains grouping around void spaces larger than the grain-size are flocs and flocs grouping around void spaces larger than even the flocs result in the formation of a ‘flocculent’ structure.

Define floc. floc synonyms, floc pronunciation, floc translation, English dictionary definition of floc. n. the separation performance under the influence of the type F flocculant we will use a fractal dimension of the formed flocs. A floc that is composed of N primary particles of radius [o] (assumed to be 5 [micro]. 2 the prevailing shear conditions and will reach a steady state. When the shear rate 3 increases above a critical level flocs will break until a new steady state is reached. In 4 some cases, because of the irreversible nature of floc breakage, flocs are unable to re-5 grow if broken at a higher shear rate.


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Effect of flow conditions on the stability of flocs by Andrew Geoffrey Rushton Download PDF EPUB FB2

In order to describe the stability of the sludge flocs under shear conditions, a new adhesion-erosion model based on chemical-equilibrium theory.

activity, which in previous research has been found to affect the floc stability (Wilén et al. Aim of the thesis (objectives) The purpose of this thesis was to study the effect of temperature on the stability of activated sludge flocs when a controlled shear rate was applied under aerobic and anaerobic Size: KB.

Interparticle interactions affecting the stability of sludge flocs taken from laboratory-scale sequencing batch reactors at different solids retention times (SRTs) were investigated in batch.

During the LIF experiment, when a bio-floc passed through the variable flow region of the flow chamber, it was accelerated by the surrounding water flow. Based on the PIV determination, the relative slip velocities in the variable flow region (−6 mm Author: Wen-jun Sun, Kit-Ming Lam, Xiao-yan Li.

In fluid measurement, the fluid's flow conditions (or flowing conditions) refer to quantities like temperature and static pressure of the metered flowing conditions are required data in order to calculate the density of the fluid at flowing conditions.

The flowing density is in turn required in order to compensate the measured volume to quantity at base conditions. In addition, Winterwerp () has developed a framework for the growth and recession of flocs under the influence of changing flow conditions, suggesting that the settling velocity could be expressed through the fractal characteristics of the flocs.

4 Flocculation: the process of forming flocs. Monodisperse: particles in the colloidal system have approximately same size. Polydisperse: a broad range of particle sizes. Sedimentation: as in creaming except that the aggregates are denser than the liquid and settle to the bottom.

Mechanisms of Colloid Formation A colloid can be prepared via two approaches:File Size: KB. Factors affecting the stability of emulsions stabilised by biopolymers The solubility and behaviour of biopolymers is dependent on various factors, such as pH, ionic strength, temperature, nature of biopolymers and medium, presence of other agents such as surfactants in the system and charge of biopolymers [ 10, 41 ].Author: Yvonne Maphosa, Victoria A.

Jideani. flocs can be separated from waters depending on their stability, size, density, etc., and according to literatures the velocity gradient of the flow is the main design parameter of the flocculators, but there is a need to take into account at least the flocs age, and the effect of temperature too.

This paper will study these factors. The morphological properties of kaolin flocs were investigated in a Couette-flow experiment at the steady state under seven shear flow conditions (shear rates of, 14, 24, 31, 41 and 53 s−1).

These properties include a one-dimensional (1-D) fractal dimension (D1), a two-dimensional (2-D) fractal dimension (D2), a perimeter-based fractal dimension (Dpf) and an aspect ratio (AR).Cited by: Stability of such steric colloids is considered to be a function of concentration of the peptizing agent in the solution, the fraction of heavy organic particle surface sites occupied by the peptizing agent, and the equilibrium conditions between the peptizing agent in solution and on surface of heavy organic particles.

The results of Fourier transform infrared (FT-IR) analysis of ZnO NPs composite contaminant flocs indicated that the combined effect of enmeshment and charge neutralization might be a possible removal by:   Effect of floc structure on the rate of shear coagulation.

Sato D(1), Kobayashi M, Adachi Y. of the derived equation was tested by a coagulation experiment using polystyrene sulfate latex particles under conditions of rapid coagulation. The experiment was carried out in a laminar Couette flow generated in the gap between two concentric Cited by: Floc definition is - a flocculent mass.

Recent Examples on the Web Preliminary results show that over and over again, snowflakes drive flocs to extinction. — Quanta Magazine, "Life’s Secrets Sought in a Snowflake," 3 Nov. In a new set of experiments, Ratcliff’s team is pitting snowflake yeast against floc yeast in a head-to-head battle.

equate to a more compact flocs in the network. The longer the suspension is sheared at low shear rates, the more time fibrils have to collide and form contacts and thus flocs, causing lower viscosity in Fig.

Fig. 3 and 4 present the stepped flow measurements measured from high to low shear rate and back for washed and unwashed MFC. FLOCS synonyms, FLOCS pronunciation, FLOCS translation, English dictionary definition of FLOCS. A flocculent mass formed in a fluid through precipitation or aggregation of suspended particles.

n another word for floccule n. a tuftlike mass, as in a. The most probable orientation of the major axis was found to be the flow direction. Assuming flocs are ellipsoids and will be disrupted by the effect of extensional component of the flow field, the cohesive strength supporting the disintegrating clusters was calculated on the basis of the simple model of floc strength proposed previously for Cited by: 2.

In flocs blanket clarifier process, flocs density is a significant parameter which determine water treatment quality and efficiency. In this study, factors effecting flocs density were evaluated though kinetic and experimental methods.

The kinetic study indicated that, the particle collision frequency, as well as flocs density, shares linear relationship with operational conditions such Author: Gang Zhang, Li Qing Zhang.

The effect of mixing conditions on the adsorption and flocculation process was studied. It was observed that flocculation time was very fast, occurring within the period of polymer addition.

Long term shearing did not result in floc breakage and the values of percentage light transmission and protein concentration of the final filtrate remained.

Full text of "Design and performance criteria for settling tanks for the removal of physical-chemical flocs: volume II /" See other formats i>ea{> 1^ Environment Canada Environnement Canada Canada Ontario Agreement on Great Lakes Water Quality Ministry of the Environment Ontario eh Program for tho Abatemant of Muiiici|>al Pollution hdar Provlaions off the Canada- Ontario.

The 4th International Conference on Mathematical Modeling and Analysis of Populations in Biological Systems Friday 04 October - Sunday 06 October Texas Tech University, Lubbock TX Book of abstracts The 4th International Conference on Mathematical Modeling and Analysis of Populations in Biological Systems / Book of abstracts.the flocculation efficiency and settling of the flocs.

The survey of various treatment processes in water and wastewater treatment shows that temperature and pH are the important factors affecting the efficiency of flocculation and settling processes. The present study investigates the effects of pH and temperature on floc stability andFile Size: KB.A)Plastic flow.

B)Pseudo-plastic flow. C)Dilatant flow. A)Plastic flow. The substance initially behaves like an elastic body and fails to flow when less amount of stress is applied.

Further increase in the stress leads to a nonlinear increase in the shear rate which then turns to linearity. Fig Graph representing the Plastic flow.