Recent advances in polysaccharide bio-based flocculants

Salehizadeh, Hossein; Yan, Ning; Farnood, Ramin

doi:10.1016/j.biotechadv.2017.10.002

Cited by 210 publications

(124 citation statements)

References 237 publications

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“…Natural polymers, or polymers derived from biomaterials, have gained increasing attention for wastewater treatment. Chitosan, starch, cellulose, alginate, and amylopectin are the main natural polymer choices due to their widespread availability, low price, nontoxicity, and biodegradability . This section reviews advances in the synthesis of functionalized natural polymers to treat various types of wastewater.…”

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

142

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

142

108

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“…There had been recent interest in modifying biomaterials such as starch, chitosan, and cellulose to develop environmentally friendly flocculants and dispersants, and few studies have focused on clay mineral suspensions or mineral unit operations such as flotation, as was discussed earlier . Hasan and Fatehi assessed two kraft lignin‐acrylamides with different molecular weights and observed that more quantities of polymer were adsorbed on kaolinite than on bentonite surfaces.…”

Section: Future Developmentsmentioning

confidence: 99%

Slurry rheology in mineral processing unit operations: A critical review

2019

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Knowledge of slurry rheology in mineral processing is essential for the optimization of wet-grinding, dewatering, transport, and tailings management and it is becoming important in flotation due to the increasing need to process complex ores with a high clay mineral content. Slurries of these ores often display complex rheological behaviour even at low solids concentration, and traditional rheology measurements in mineral processing, such as yield stress and apparent viscosities, may not provide the critical information needed for process optimization. The objective of this paper is to provide a comprehensive review of some of the previous rheology studies performed at the bench, pilot plant, and industrial scale for different unit operations and to discuss the potential for alternative rheology measurements to provide a better insight into colloidal particle interactions in slurries with clay minerals. Firstly, the fundamentals of slurry rheology and the influence of colloidal particles are presented. Secondly, rheology measurements for suspensions are described briefly. Thirdly, a review of rheology studies in grinding, classification, flotation, dewatering, and tailings management is done, outlining possible ways of determining types of particle associations in slurries. Finally, recommendations for future research directions are provided.

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“…Various types of grafting methods have been discovered such as conventional redox grafting using chemical 10,11 , γ-ray irradiation 12 , ultraviolet (UV) light irradiation 13 , microwave irradiation 11 and by using electron beam 14 . Among these methods, microwave irradiation is the simplest and most promising method to synthesize high-quality of grafted polymer.…”

mentioning

confidence: 99%

Microwave radiation-induced grafting of 2-methacryloyloxyethyl trimethyl ammonium chloride onto lentil extract (LE-g-DMC) as an emerging high-performance plant-based grafted coagulant

Chua

Kait

Mustafa

et al. 2020

Sci Rep

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The importance of graft copolymerization in the field of polymer science is analogous to the importance of alloying in the field of metals. This is attribute to the ability of the grafting method to regulate the properties of polymer 'tailor-made' according to specific needs. This paper described a novel plantbased coagulant, LE-g-DMC that synthesized through grafting of 2-methacryloyloxyethyl trimethyl ammonium chloride (DMC) onto the backbone of the lentil extract. The grafting process was optimized through the response surface methodology (RSM) using three-level Box-Behnken Design (BBD). Under optimum conditions, a promising grafting percentage of 120% was achieved. Besides, characterization study including SEM, zeta potential, TGA, FTIR and EDX were used to confirm the grafting of the DMC monomer chain onto the backbone of lentil extract. The grafted coagulant, LE-g-DMC outperformed lentil extract and alum in turbidity reduction and effective across a wide range of pH from pH 4 to pH 10. Besides, the use of LE-g-DMC as coagulant produced flocs with excellent settling ability (5.09 mL/g) and produced the least amount of sludge. Therefore, from an application and economic point of views, LE-g-DMC was superior to native lentil extract coagulant and commercial chemical coagulant, alum.Coagulation-flocculation is one of the most widely used treatment processes for the removal of turbidity, colloid, dissolved solid, organic matter and suspended solid in surface water and industrial wastewater 1 . Due to its simplicity, cost-effective and efficient properties, this process has been extensively used for various wastewater treatments such as textile wastewater 2 , agro-wastewater 3 , landfill leachates 4 , pulp and paper mill wastewater 5 and others. Some of the chemical coagulants that commonly used for the wastewater treatment are aluminium sulphate, ferric sulphate, ferric chloride and polyaluminium chloride. However, the usage of these chemicals poses several drawbacks, such as adverse effects on human health, relatively high cost, production of large sludge volumes and others 6 . It is, therefore, desirable to have an alternative material that is effective, environmentally friendly and economically viable to replace the current synthetic coagulants.

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Recent advances in polysaccharide bio-based flocculants

Cited by 210 publications

References 237 publications

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

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

Slurry rheology in mineral processing unit operations: A critical review

Microwave radiation-induced grafting of 2-methacryloyloxyethyl trimethyl ammonium chloride onto lentil extract (LE-g-DMC) as an emerging high-performance plant-based grafted coagulant

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