The flocculation of kaolin aqueous dispersion by two cationic polyelectrolytes

Dryabina, S. S.; Fotina, Ksenia M.; Навроцкий, А. В.; Новаков, И. А.

doi:10.1016/j.colsurfa.2016.11.055

Cited by 17 publications

(6 citation statements)

References 31 publications

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“…In addition, the flocs/AS aggregates indicate that the treatment forms a larger, more and denser compact structure with the dual-chemical conditioning. The paper here in [15] shows that the use of the flocculation by compositions, based on synthetic and natural polyelectrolyte using an aqueous kaolin dispersion, fosters improvement of floc sedimentation rates as well as the formation of two fold denser floc compared to using individual flocculants. At the study [17] oppositely charged polyelectrolytes were used and stimulated a significant improvement in the particles flocculation and significant turbidity reduction.…”

Section: Introductionmentioning

confidence: 99%

“…The main factors of flocs formation are bridging and the surface charge neutralization due to simultaneous polyelectrolyte macromolecules adsorption on the several particles surface. Also flocculation may occur by depletion flocculation or by the combination of these mechanisms [15]. Chen and Wang [16] studied the use of flocculants in singleand dual-chemical conditioning to treat activated sludge (AS).…”

Section: Introductionmentioning

confidence: 99%

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Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Ribeiro¹,

Filho²,

Rozeno³

et al. 2017

Express Polym. Lett.

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Abstract. Biodiesel wastewater generally contains high levels of oils, soaps and glycerol residues. This needs wastewater treatment. In this study, the biodiesel wastewater treatment was tested (industrial wastewater (EFID) and laboratory wastewater (EFLB) from biodiesel) by performing flocculation and dual-flocculation with renewable polymers. Tannin and cationic hemicellulose (CH) were used as cationic flocculant, and cellulose acetate sulfate (CAS) was used as an anionic flocculant. Polyacrylamide (PAM) was used as a reference anionic flocculant for result efficiencies analysis obtained with CAS (renewable source flocculant). The treatment efficacy in wastewater was evaluated by: turbidity removal, sludge volume formed, chemical oxygen demand (COD) and total suspended solids (TSS). The obtained sludge was studied using thermogravimetric analysis (TG). The dual-flocculation application condition of the 25% proportion of tannin (T) and 75% proportion of cationic hemicelluloses (i.e., T25/CH75) showed EFLB turbidity removal of 89.1% and 89.5% for CAS and PAM additions respectively, and for EFID of 67% and 41% for CAS and PAM additions respectively. The dual-flocculation performance suggested that the polyelectrolytes obtained from renewable sources can be used for treating biodiesel wastewater.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Ribeiro¹,

Filho²,

Rozeno³

et al. 2017

Express Polym. Lett.

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“…Currently, natural polymers have become more popular than synthetic ones due to increasing environmental awareness [ 24 ]. Chitosan and its derivatives appear to be good candidates to be used as retention and drainage agents in papermaking industry and numerous application strategies of chitosan have already been investigated [ 10 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. Nicu et al compared the ability of three chitosans with different molecular weights to flocculate grounded calcium carbonate (GCC) and pulp/GCC suspensions in papermaking [ 34 ].…”

Section: Wet-end Applicationmentioning

confidence: 99%

Application of Chitin/Chitosan and Their Derivatives in the Papermaking Industry

Song

Guan

et al. 2018

Polymers

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Chitin/chitosan and their derivatives have become of great interest as functional materials in many fields within the papermaking industry. They have been employed in papermaking wet-end, paper surface coating, papermaking wastewater treatment, and other sections of the papermaking industry due to their structure and chemical properties. The purpose of this paper is to briefly discuss the application of chitin/chitosan and their derivatives in the papermaking industry. The development of their application in the papermaking area will be reviewed and summarized.

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“…[3] However, their use as flocculating agents is restricted by the structure of the substrates and the characteristics of the polymers. [11,12] Therefore, total separation cannot be achieved by using simple polymers as flocculants.…”

Section: Introductionmentioning

confidence: 99%

Impact of mechanochemical treatment on surface chemistry and flocculation of kaolinite dispersion

Bhatti

Baloch

Schwarz

et al. 2023

Asia-Pacific J Chem Eng

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For many industrial applications, an extensive research of the stabilization and destabilization mechanisms of aqueous suspensions of fine particles is crucial. The flocculation of charged particles from their aqueous suspensions is greatly influenced by the surface characteristics of the particles. For the purpose of improving the flocculation efficiency of kaolin suspensions, the impact of the proposed mechanochemical treatment, which includes homogenization and/or ultrasonication followed by the addition of polycation such as poly (diallyl dimethyl‐ammonium chloride) (PDADMAC), was examined under standard conditions. It was demonstrated that parameters including kaolin's specific surface area, surface charge density, and particle size reduction are all affected by the duration of the ultrasonication. While ultrasonication (10 min) has a significant impact on particle size distributions, 300 and 200 nm‐sized particles were also seen. A narrow flocculation window was obtained by PDADMAC at a Cp/Cs ratio of 0.1 mg/g (Cp/Cs means the ratio of mass polymer/mass substrate), while the mechanical treatment via homogenization with magnetic stirring (60 min) resulted in a larger flocculation window of kaolin caused by the polyelectrolyte used. However, mechanochemical treatment via ultrasonication followed by the addition of aforementioned polyelectrolyte played a significant role in achieving the highest turbidity removal. Hence, the settling behavior of kaolin suspension depends upon the pH, ultra‐sonication time, and the concentration of polyelectrolyte. The combination of ultra‐sonication, PDADMAC dosage, and pH (mechanic‐chemical treatment) played an excellent role in the maximum removal of turbidity, and the broadest flocculation window comprising of 0.4 to 1.6 mg/g was observed at pH 8.

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The flocculation of kaolin aqueous dispersion by two cationic polyelectrolytes

Cited by 17 publications

References 31 publications

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Application of Chitin/Chitosan and Their Derivatives in the Papermaking Industry

Impact of mechanochemical treatment on surface chemistry and flocculation of kaolinite dispersion

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