The role of mixing conditions on floc growth, breakage and re-growth

Yu, Wenzheng; Gregory, John; Campos, Luiza C.; Li, Guibai

doi:10.1016/j.cej.2011.03.098

Cited by 109 publications

(50 citation statements)

References 22 publications

(30 reference statements)

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“…3, the FSD of flocs before and after breakage with same d 50 was nearly the same, while the grown and re-grown ability were significantly different. Surface activity was brought forward in our previous papers [10,18], and here we put forward "active point". A schematic diagram is shown to explain the variation of flocs activity in flocs formation, breakage process (Fig.…”

Section: Discussionmentioning

confidence: 99%

Effect of dosage strategy on Al-humic flocs growth and re-growth

Liu

et al. 2012

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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a b s t r a c tThe ability of flocs growth has a significant effect on the efficiency of solid/liquid separation during coagulation process. The growth and re-growth of flocs by one time or continuous dosage were explored at neutral pH, including one time and continuous additional dosage strategy after flocs breakage. The size of flocs formed by continuous dosage before breakage was much larger than the one formed by one time dosage. There was significant irreversibility of floc breakage when no additional coagulant was added. For the one with one time initial dosage strategy, the size of re-grown flocs by one time additional dosage was nearly the same as that before breakage. The re-grown flocs formed by continuous additional dosage were a little smaller than that formed by one time additional dosage. It definitely showed that the growth or connection of flocs was probably not determined by the flocs size distribution and fractal dimension, but by the surface activity of flocs. Additional dosage could improve flocs re-grown ability because the surface activity of broken flocs was repaired by adding new alum.

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Section: Discussionmentioning

confidence: 99%

Effect of dosage strategy on Al-humic flocs growth and re-growth

Liu

et al. 2012

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…It has been found that coagulation process is affected by mixing conditions and, the rapid mix time had a significant effect on ultimate coagulation yield. Short period of rapid mixing perform better than long rapid mixing on turbidity removal [15]. If the mixing time is short, it will result in the growth of larger flocs (except for flocs with lower shear strength) [3].…”

Section: Mixing Effectmentioning

confidence: 99%

Timecourse Study of Coagulation-Flocculation Process Using Aluminum Sulfate

Farasat¹,

Panahi²,

Mokhtarani³

2017

Water conserv. manag.

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In conformity with drinking water standards, water purification units must remove colloid impurities in water which shelters microorganisms such as bacteria and viruses, and natural organic matter (NOM) using the sequence of treatment processes including coagulation-flocculation, sedimentation or filtration and disinfection. The coagulationflocculation process consists of rapid mixing, followed by slow mixing and settling at room temperature. Efficiency of coagulation-flocculation process depends on process parameters. Optimization of significant parameters such as initial pH, coagulant and flocculant dosage, settling time, mixing parameters and the effective temperature for coagulation-flocculation performance is crucial. In this study, time course study of coagulation-flocculation as well as the effects of coagulant dosage and pH in the synthetic wastewater produced by kaolin was investigated. Coagulant dosage and pH optimization is necessary to achieve optimal efficiency. Appropriate coagulant dosage, pH and settling time were 70 mg/L, 6.5 and 45 minutes, respectively and resulted in 99.72% turbidity removal.Cite this article as: Zahra Farasat, Reza Panahi, Babak Mokhtarani (2017). Timecourse Study Of CoagulationFlocculation Process Using Aluminium Sulfate. Water Conservation and Management , 1(2):07-09.

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“…It is likely that the rapid mixing velocity has an important role in the formation of flocs and their corresponding floc sizes [28][29][30]. The floc size depends on hydrodynamic processes due to size changes if the mixing intensity is modified [29].…”

Section: Impact Of Synthetic Raw Water Flocs On Dewaterabilitymentioning

confidence: 99%

Impact of Sludge Floc Size and Water Composition on Dewaterability

et al. 2014

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In order to observe the impact of different water compositions on sludge dewaterability, assessments of floc sizes using a particle size analyzer and of sludge dewaterability based on the capillary suction time (CST) test were carried out. Synthetic raw water had small floc sizes, and synthetic domestic wastewater had both larger median floc sizes and a better correlation between sludge dewaterability and median floc sizes. The floc size distribution results showed that synthetic raw water is associated with a narrow particle size distribution. In comparison, synthetic domestic wastewater produced a wider distribution. However, the CST values were similar for both waters. Compared to synthetic wastewater, natural wastewater had the largest distribution with generally larger particle sizes.

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The role of mixing conditions on floc growth, breakage and re-growth

Cited by 109 publications

References 22 publications

Effect of dosage strategy on Al-humic flocs growth and re-growth

Effect of dosage strategy on Al-humic flocs growth and re-growth

Timecourse Study of Coagulation-Flocculation Process Using Aluminum Sulfate

Impact of Sludge Floc Size and Water Composition on Dewaterability

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