The sedimentation performance of kaolin particles under non-stirring conditions in the absence or presence of KLD were assessed by a vertical scan analyzer, Turbiscan (Lab Expert, Formulaction).

This initially forms small flocs that grow with time and when sufficiently dense or large undergo fast sedimentation (Hogg, 2000). Flocculants can be characterised according …

However, most research has focused on kaolin, humic acid, and clay flocs. Table 1 shows that floc size, fractal geometry, and strength are most frequently used to …

The sedimentation of flocs in aquatic environments is a fundamental phenomenon that has not yet been fully elucidated. This study quantitatively examines sedimentation behavior, particularly focusing on sedimentation turbulence, in a two-dimensional system between flat plates, utilizing image analysis. Experiments were …

The physical and hydrodynamic properties of kaolin flocs including floc size, strength, regrowth, fractal structure and settling velocity were investigated by in situ particle image velocimetry technique at different humic acid concentration. Jar-test experimental results showed that the adsorbed hu …

Photomicrographs of the flocs formed in the kaolin flocculation by PAMs. ... A dynamic floc measurement system was developed to analyze flocs during sedimentation and automatically extract floc ...

Semantic Scholar extracted view of "Role of mixing conditions on coagulation performance and flocs breakage formed by magnesium hydroxide" by Jianhai Zhao et al. ... to simulate actual water treatment works and explored the impact of the coagulant dosage and shear rate combination on kaolin floc properties. ... The sedimentation behaviour …

Initially, the variations in the characteristics of flocs of kaolin with salinity and turbulence were examined, followed by characterization of flocs under the addition of sand fraction at different proportions (10%, 20%, 40% and 50%). ... Coagulation-sedimentation has been widely used for the emergency removal of harmful algal blooms (HABs).

The present work deals with the estimation of average floc diameter using sedimentation and optical data. This study was applied to a kaolin suspension destabilized by chemical dosing with iron salts (FeCl 3 or FeSO 4) or electrocoagulation (EC) with iron electrodes.Optimum pH and coagulant concentration were defined by …

This process uses microsand and polymer flocculants to accelerate the sedimentation process by forming large flocs with a high specific density (Lapointe & Barbeau 2016). ... Kaolin (FUJIFILM Wako Pure Chemical Co., Osaka, Japan) was used as suspended clay particles to prepare a 10-g/L slurry-like stock solution.

Jeldres et al. carried out flocculation and sedimentation experiments on suspensions of quartz and kaolinite mixtures, finding a direct relationship between flocs microscopic …

The Fig. 1 showed the variation of residual turbidity and zeta potential as a function of the alum dose. The zeta potential of original kaolin suspension was less than − 15 mv and the turbidity was close to 50 NTU.When the alum dose was less than 0.1 mmol l − 1, the zeta potential increased rapidly with the alum dose, on the contrary, the turbidity …

The settling time on flocculation of kaolin suspension by using CPAMF and CPAM was investigated to estimate the sedimentation performance of flocs. The results are presented in Fig. 8 a. The residual turbidity of adding CPAMF has been as low as 15 NTU in the initial 1 min.

DOI: 10.1016/j.watres.2011.05.006 Corpus ID: 19534075; Effects of humic acid on physical and hydrodynamic properties of kaolin flocs by particle image velocimetry. @article{Zhong2011EffectsOH, title={Effects of humic acid on physical and hydrodynamic properties of kaolin flocs by particle image velocimetry.}, author={Run-sheng Zhong …

The sedimentation studies, conducted under gravitational (by vertical scan analyzer) and centrifugal force (by Lumisizer analytical centrifuge), revealed that KLD5 was very …

The effect of the solution pH and alum concentration on the EM of flocs before and after breakage is shown in Fig. 1.Prior to alum dosage, the EM values of kaolin particles at pH 7 and 5 were −3.6 and −2.2 (μm s −1 V −1 cm −1), respectively.For all alum dosages, the EM values were higher (less negative) at pH 5 than that at pH 7.

Estimating the Shear Resistance of Flocculated Kaolin Aggregates: Effect of Flocculation Time, Flocculant Dose, and Water Quality. by. Kevin Pérez. 1, Norman …

Floc structure plays an important role in the separation of coal wastewater. In this study, a camera-based method is used to evaluate quantitatively the structural characteristics of flocs ...

Accurate strength values of flocs formed using CC have also been reported, including flocs that sheared at G = 50 s −1 and G = 230 s −1, with floc strengths of 0.08 and 0.42 N m −2, respectively [113]. Li et al. [56] calculated the floc strength of kaolin-alum flocs to be 0.01–0.58 N m −2, using Eq. (19). These successful cases of CC ...

Kaolin aerated flocs formation assisted by polymer-coated microbubbles. International Journal of Mineral Processing (2012) ... (HDS) process, a typical neutralization and sedimentation process. However, despite its widespread use, the HDS process requires prolonged treatment durations and presents challenges in sludge dewatering …

To mitigate the sudden increase in the production of waste engineering slurry, predominantly composed of Kaolinite, this study investigated the flocculation and …

(PDF) SEDIMENTATION OF KAOLIN: EFFECTS OF At high surface coverage of kaolin particles or with 04dwb% PEI, flocs formed are loosely packed and more voluminous. sedimentation kaolin flocs 2021-11-06T10:11:27+00:00 Mobile Crushers. The crushing equipments for rocks and construction waste, and expands the conception of primary …

Regularities of the flocculation of kaolin suspension with cationic polyelectrolytes based on 1,2-dimethyl-5-vinylpyridinium methyl sulfate were studied by turbidimetry, optical microscopy, and sedimentation methods. It was found that poly(1,2-dimethyl-5-vinylpyridinium methyl sulfate)-co-N-vinylpirrolidone promotes the formation of dense …

Aerated carbon and kaolin flocs formed by the addition of a high molecular weight polymer flocculant with bubbles that are free, attached and trapped inside flocs. Sources: ... Sedimentation and flotation. R.D. Letterman (Ed.), Water Quality and Treatment: A Handbook of Community Water Supplies, McGraw-Hill (1999), p. 1248.

In the water treatment industry, the formed flocs often have a large settling rate in water columns; consequently, some absorbed pollutants can be removed by sedimentation and/ or filtration ...

The final solids content of kaolin was approximately constant regardless of salt type and concentration (solids content = 26–37%). Soda ash mine tailings exhibited sedimentation behavior similar to kaolin, which showed approximately constant initial sedimentation rate and final solids content for the range of salt concentrations evaluated.

The floc morphology was investigated in a continuous-flow reactor, in order to understand the evolution of flocs in practical flocculation and sedimentation processes in water utilities. Kaolin-humic acid suspension was used as the test water, and polyaluminum chloride was chosen as the coagulant.

Sedimentation rate of kaolin suspensions with different doses of flocculant in SW and IW at a shear rate of 200 rpm. ... The time evolution of the average size of the kaolin flocs measured when the particle suspension is subjected to incremental shear rates from a predetermined base value, reveals a shear rupture rate characteristic of these ...

The analytical centrifugation analyzer LUMisizer (LUM , Germany) was used to determine the sedimentation velocities of kaolin and KLD/kaolin foci. Each measurement involved adding 1.1 mL of a clay solution (unless otherwise stated) to the instrument's cell, centrifuging it for 20 min at various speeds (200× g, 400× g, 500× g, …

Meanwhile, the turbidity and UV 254 values of settled water became lower at 30 and 180 s of sedimentation, suggesting that varying split ratios significantly affected the kinetics of ballasted floc growth. Moreover, it was suggested that the selection of either two-stage injection mode or corresponding split ratios played a more pronounced role ...