A study of titanium sulfate flocculation for water treatment

Wu, Yifan; Liu, Wen; Gao, Naiyun; Tao, Tao

doi:10.1016/j.watres.2011.04.023

Cited by 73 publications

(33 citation statements)

References 10 publications

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“…Thus the impurities leading to high turbidity was removed by sedimentation. Furthermore, the plot demonstrated that the introduction of Ti 4+ had enhanced the DOC removal significantly in the Ti/Fe range of 1/10-1/6, in which improvement may be attributed to the fact that the Ti-based coagulant has high NOM removal efficiency, as reported by Gao et al (Wu et al 2011;Zhao et al 2013a;Zhao et al 2014). Figure 5b shows the variation of colloid charge and RIC with different Ti/Fe molar ratios.…”

Section: Effect Of Ti/fe On Coagulation-flocculation Performancesupporting

confidence: 57%

“…Recently, due to the price of titanium salts is gradually becoming comparable to the conventional coagulants (Wu et al 2011); titanium-based coagulants have received widespread attention in water treatment. Research results showed that Ti coagulants can effectively flocculate in a slightly acidic environment, achieve higher FA and arsenite(III) removal efficiency, and possesses no direct link between treated water and health risks Wu et al 2011;Zhao et al 2013b).…”

mentioning

confidence: 99%

“…Research results showed that Ti coagulants can effectively flocculate in a slightly acidic environment, achieve higher FA and arsenite(III) removal efficiency, and possesses no direct link between treated water and health risks Wu et al 2011;Zhao et al 2013b). In addition, study has indicated that the presence of PO 4 3− in ferric sulfate synthesized strong complex Fe-P-Fe chemistry bond, which was considered to have positive effect on the stability of coagulants, increasing the molecular weight, enhancing the aggregation capacity as well as decreasing residual iron concentration in coagulation process.…”

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confidence: 99%

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Preparation and Characterization of a Composite Coagulant: Polyferric Titanium Sulfate

Chen

Zheng

Guo

et al. 2016

Water Air Soil Pollut

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In this study, a novel composite coagulant polyferric titanium sulfate (PFTS) was synthesized and the kaolin-fulvic acid simulated water was employed to verify the coagulation efficiency. To obtain the optimal conditions for preparing the composite coagulant, the parameters affecting the coagulation performance such as Ti/Fe, P/Fe, OH/Fe, and oxidizer dosage were evaluated by single factor experiments and response surface methodology. The structure and morphology of PFTS were investigated by some conventional methods and those affecting coagulation-flocculation behaviors such as coagulant dosage, water sample initial pH, were also examined. Flocs properties of PFTS were investigated by Mastersizer 2000. The results indicated that PFTS presented a porous and a compacted gel network structure, in which some major phase structure and chemical bonds were discovered. The jar tests demonstrated the superior coagulation performance at coagulant dosage of 20-30 mg/L and the optimum pH range of 7-8. The optimum synthetic conditions were Ti/Fe, P/Fe, OH/Fe molar ratio and oxidant adding speed of 0.13, 0.25, 0.29, and 4 mL/min, respectively. Under the optimal condition, the residual turbidity, (Dissolved organic matter) DOC removal and residual iron of 0.82, 53 %, and 0.08 mg/L, respectively, could be acquired by PFTS. The flocs analysis results manifested that the dominant mechanism in flocs growth is absorption-bridging and sweeping coagulation, while charge neutralization mechanisms is the primary in the formation of compact flocs.

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Section: Effect Of Ti/fe On Coagulation-flocculation Performancesupporting

confidence: 57%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Preparation and Characterization of a Composite Coagulant: Polyferric Titanium Sulfate

Chen

Zheng

Guo

et al. 2016

Water Air Soil Pollut

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“…Flocculation is an important method in the field of water and wastewater treatment [1][2][3]; it can assist in migrating, transforming, and removing particulate matter in water. In flocculation processes, particulates in colloidal suspension randomly collide and coagulate with each other, resulting in the formation and sedimention of fractal-like flocs (aggregates).…”

Section: Introductionmentioning

confidence: 99%

Fractal Simulation of Flocculation Processes Using a Diffusion-Limited Aggregation Model

Liu

Zhang

et al. 2017

Fractal Fract

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Abstract:In flocculation processes, particulates randomly collide and coagulate with each other, leading to the formation and sedimention of aggregates exhibiting fractal characteristics. The diffusion-limited aggregation (DLA) model is extensively employed to describe and study flocculation processes. To more accurately simulate flocculation processes with the DLA model, the effects of particle number (denoting flocculation time), motion step length (denoting water temperature), launch radius (representing initial particulate concentration), and finite motion step (representing the motion energy of the particles) on the morphology and structure of the two-dimensional (2D) as well as three-dimensional (3D) DLA aggregates are studied. The results show that the 2D DLA aggregates possess conspicuous fractal features when the particle number is above 1000, motion step length is 1.5-3.5, launch radius is 1-10, and finite motion step is more than 3000; the 3D DLA aggregates present clear fractal characteristics when the particle number is above 500, the motion step length is 1.5-3.5, the launch radius is 1-10, and the finite motion step exceeds 200. The fractal dimensions of 3D DLA aggregates are appreciably higher than those of 2D DLA aggregates.

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“…The main goal of their use is to remove all microimpurities from water, which give its undesirable color and turbidity. The flocculation process, consisting in concentration of the dispersed particles into larger agglomerates (floccules) due to the polymer (flocculent) addition, is highly effective in the removal of colloids from water [1][2][3][4][5][6]. The obtained floccules undergo sedimentation and filtration, which leads to complete removal of selected pollutants.…”

Section: Introductionmentioning

confidence: 99%

Investigations of flocculation possibilities of the water alumina suspension in the presence of nonionic polymer

Wiśniewska

Chibowski

Urban

2013

Journal of Industrial and Engineering Chemistry

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A study of titanium sulfate flocculation for water treatment

Cited by 73 publications

References 10 publications

Preparation and Characterization of a Composite Coagulant: Polyferric Titanium Sulfate

Preparation and Characterization of a Composite Coagulant: Polyferric Titanium Sulfate

Fractal Simulation of Flocculation Processes Using a Diffusion-Limited Aggregation Model

Investigations of flocculation possibilities of the water alumina suspension in the presence of nonionic polymer

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