Characterization and coagulation-flocculation performance of a composite flocculant in high-turbidity drinking water treatment

Xiang, Xia; Lan, Shuhuan; Li, Xudong; Xie, Yonghong; Liang, Yajie; Yan, Peihan; Chen, Zhengyang; Xing, Yunxiao

doi:10.1016/j.chemosphere.2018.04.159

Cited by 66 publications

(27 citation statements)

References 42 publications

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“…The combination of microbial bioflocculants and inorganic coagulants can reduce the dosage of harmful inorganic coagulants, while keeping the flocculation performance the same. A microbial bioflocculant Klebsiella variicola B16 was used in combination with polyaluminum ferric chloride (PAFC) to reduce the turbidity and remove suspended solids from drinking water …”

Section: Recent Advances In the Development Of Water Soluble Flocculantsmentioning

confidence: 99%

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Vajihinejad

Gumfekar

Bazoubandi

et al. 2018

Macro Materials & Eng

137

108

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Water soluble polymer flocculants are important constituents of solid–liquid separation units for the treatment of a variety of process‐affected effluents. The systematic development of a flocculant relies on a good understanding of flocculation process, polymer synthesis, polymer characterization, and, not the least, flocculation performance assessment as desired for a particular treatment process, all of which are essential to establish meaningful relationships between flocculant microstructure and flocculation efficiency. The aim of this article is to communicate the bigger picture of this research area to the readers. The recent advances in the application of bio/natural, synthetic, and stimuli‐responsive flocculants are reviewed. Then, the basic polymer reaction engineering tools to control the microstructure of flocculants are provided and the techniques for the quantification of flocculant microstructure are concisely discussed. This is followed by a review of the methods used for the characterization of particle‐polymer force measurement, and flocculation/dewatering assessment with attention to the characterization of aggregate structures.

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Section: Recent Advances In the Development Of Water Soluble Flocculantsmentioning

confidence: 99%

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Vajihinejad

Gumfekar

Bazoubandi

et al. 2018

Macro Materials & Eng

137

108

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“…Flocculation process refers to the process of polymerization of multiple particles [119,143]. In the process of flocculation, there are colloid particles from a stable state [144,145].…”

Section: Adsorption Bridgingmentioning

confidence: 99%

“…In the process of flocculation, there are colloid particles from a stable state [144,145]. According to adsorption bridging theory, microbial flocculant is a kind of chain macromolecule which has the characteristics of high molecular weight and low charge density [119,143]. There are adsorbed active sites on the molecule.…”

Section: Adsorption Bridgingmentioning

confidence: 99%

“…The colloid in the water generally carries a negative charge. When adding microbial flocculant, a neutralizing effect occurs between them as the flocculant is macromolecules with a positive charge on the surface [143]. Due to the reduction of the surface charge of the particles, that is, the Zeta potential is reduced, the repulsive force between the particles is reduced [151,152].…”

Section: Charge Neutralitymentioning

confidence: 99%

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Preparation, Performances, and Mechanisms of Microbial Flocculants for Wastewater Treatment

et al. 2020

IJERPH

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In recent years, close attention has been paid to microbial flocculants because of their advantages, including safety to humans, environmental friendliness, and acceptable removal performances. In this review, the preparation methods of microbial flocculants were first reviewed. Then, the performances of bioflocculants in the removal of suspended solids, heavy metals, and other organic pollutants from various types of wastewater were described and commented, and the removal mechanisms, including adsorption bridging, charge neutralization, chemical reactions, and charge neutrality, were also discussed. The future research needs on microbial flocculants were also proposed. This review would lead to a better understanding of current status, challenges, and corresponding strategies on microbial flocculants and bioflocculation in wastewater treatment.

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“…It is clear that compared with the other three flocculants, the flocs corresponding to CTS-g-PAMD-2 has the largest particle size before and after crushing and the crushed coal fragments still have strong renewable property and can quickly gather together to form a large and dense flocs particle. When the shear force generated by rapid stirring will significantly destroy the bridging effect between the original flocs and the bridging and adsorption effect between the flocs by the polymer chain will rapidly weaken, at this time, the electric neutralization and adsorption effect will play a dominant role in the flocculation process [55]. As cationic CTS and DAC in CTS-g-PAMD-2 significantly enhance the charge neutralization, electrostatic and bridging adsorption of flocculant, once the flocs are destroyed by large shear force, the cationic structures accumulated on small fragments of sludge flocs will recombine under the action of charge neutralization and adsorption capture and aggregate again to generate larger dense flocs.…”

Section: Floc Formation Breakage and Regrowthmentioning

confidence: 99%

Chitosan Modified Cationic Polyacrylamide Initiated by UV-H2O2 for Sludge Flocculation and New Insight on the Floc Characteristics Study

Chen

Nie

et al. 2020

Polymers

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In the present study, a novel graft modified flocculant CTS-g-PAMD was synthesized and applied to conduct sludge conditioning and dewatering. CTS-g-PAMD was copolymerized with AM, DMC and chitosan (CTS) under UV-H2O2 initiation. In addition, the effects of single factor experiments on the molecular weight (MW) CTS grafting efficiency (GE) of CTS-g-PAMD were determined and the optimal copolymerization conditions were achieved. The GE of CTS-g-PAMD reached 91.1% and the MW was 4.82 × 106 Da. As revealed from the characterized results of Fourier-transform infrared spectra (FT-IR), 1H/ NMR, X-ray diffraction (XRD), scanning electron microscopic (SEM) and X-ray photoelectron spectroscopy (XPS), the successful synthesis of CTS-g-PAMD was confirmed, which is considered to be conducive to explaining sludge dewatering performance. Under the optimal conditions (pH = 7.0, flocculant dosage = 35 mg/L), the best flocculating performance (FCMC: 73.7%; SRF: 4.7 × 1012 m·kg−1, turbidity: 9.4 NTU) and large and dense sludge flocs (floc size d50 = 379.142 µm, floc fractal dimension Df = 1.58) were formed. The DMC and CTS chain segments exhibiting cationic properties significantly improved the positive charge density and enhanced the electrical patching effect of CTS-g-PAMD. The long molecular chain of CTS-g-PAMD exhibited superior extensibility, which enhanced bridging effect on adsorption. Moreover, the sludge floc after undergoing CTS-g-PAMD conditioning exhibited robust shear resistance and regeneration ability. After the sludge floc was crushed and broken, a large and dense sludge floc was formed, helping significantly reduce the sludge specific resistance (SRF), turbidity and cake moisture content (FCMC) and enhance the sludge dewatering effect. The novel CTS-g-PAMD flocculant shows promising practical applications and high market value.

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Characterization and coagulation-flocculation performance of a composite flocculant in high-turbidity drinking water treatment

Cited by 66 publications

References 42 publications

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Preparation, Performances, and Mechanisms of Microbial Flocculants for Wastewater Treatment

Chitosan Modified Cationic Polyacrylamide Initiated by UV-H2O2 for Sludge Flocculation and New Insight on the Floc Characteristics Study

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