Migration and distribution of sodium ions and organic matters during electro-dewatering of waste activated sludge at different dosages of sodium sulfate

Xiao, Jun; Xu, Wu; Yu, Wenbo; Liang, Sha; Yu, Jiangwei; Gu, Yuanzheng; Deng, Huali; Hu, Jiukun; Xiao, Keke; Yang, Jiakuan

doi:10.1016/j.chemosphere.2017.09.034

Cited by 47 publications

(17 citation statements)

References 29 publications

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“…Nevertheless, a large floc size could be disadvantageous for sludge dewatering. Large and loose flocs with a high content of intrafloc water (water from within the floc, comprising loops and tails) [35], which is not easily removed during filtration, were formed, and this phenomenon corresponded well with the high FCMC of SP ( Figure 13). The different initiation systems included the origin of different sludge conditioning performances and mechanisms.…”

Section: Sludge Floc Properties and Flocculation Mechanismmentioning

confidence: 70%

Preparation, Characterization, and Sludge Conditioning of Cationic Polyacrylamide Synthesized by a Novel UVA-Initiated System

et al. 2018

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Controlling the concentration of free radicals in polymerization systems is advantageous for preparing cationic polyacrylamide (CPAM) with a high molecular weight and acceptable dissolvability. In this study, a novel ultraviolet (UVA)-initiated system characterized by an adjustable light intensity and a redox-azo complex initiator was used to synthesize a CPAM flocculant named NP. Comparatively, another CPAM flocculant named SP with a stable UVA light intensity and a single initiator was prepared. Their chemical structure, morphology, and thermal stability were analyzed through instrumental analysis. 1H NMR indicated that NP was successfully prepared, and a small fraction of a cationic homopolymer was mixed in the product. Polymerization conditions of NP were optimized, and polymerization mechanism was determined by investigating the effects of various parameters on intrinsic viscosity, conversion, and dissolvability. Results showed that the best performance was obtained at indices of 0.45 wt‰ redox initiator concentration, 0.2 wt‰ azo initiator concentration, 40.0 wt% cationic monomer, 3 wt‰ urea, and first- and second-stage light intensities of 8.5 and 13 mW/cm2, respectively. The sludge conditioning performances of NP and SP were comparatively evaluated, and the mechanism was determined by examining sedimentation behavior and floc size distribution. High intrinsic viscosity, porous morphology structure, and mixed NP cationic homopolymer contributed to the improvement of sludge conditioning performance.

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Section: Sludge Floc Properties and Flocculation Mechanismmentioning

confidence: 70%

Preparation, Characterization, and Sludge Conditioning of Cationic Polyacrylamide Synthesized by a Novel UVA-Initiated System

et al. 2018

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“…36 Zeta potential of supernatant of sample suspension (1 : 50 w/v water) was determined by zeta potential analyzer (Zetasizer nano ZS90, Malvern). 3 10 g sludge was suspended into 25 mL of 0.05% NaCl solution and the loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) from the sludge were extracted by a modied heat extraction method. 37 Both the LB-EPS and TB-EPS extractions were analyzed for PN and polysaccharides (PS).…”

Section: Methodsmentioning

confidence: 99%

“…[23][24][25] For realizing the change of sludge properties, conventional sludge pretreatment was achieved by using chemical conditioning agents (e.g., acid, alkali or electrolyte). 3,26,27 Besides, ultrasonication, 28 freeze/thaw conditioning, 21 and magnetic conditioning 29 were also used to damage EPS and change sludge structure.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of sludge electro-dewaterability during biological conditioning

Liu

et al. 2020

RSC Adv.

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“…However, such large floc size can be disadvantageous for sludge dewatering. Previous studies examined that large and loose flocs with high content of intrafloc water (water from within the floc, comprising loops and tails) [33], which is not easily removed during filtration, were formed. This phenomenon corresponded well with the high FCMC of SP, as indicated in Figure 12.…”

Section: Mechanism and Advantages Of The Novel Uv Initiation Systemmentioning

confidence: 99%

Preparation, Characterization, and Sludge Conditioning of Cationic Polyacrylamide Synthesized by a Novel UV-Initiated System

Guan¹,

Zhu²,

Liao³

et al. 2018

Preprint

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Controlling the concentration of free radicals in polymerization systems is advantageous for preparing cationic polyacrylamide (CPAM) with high molecular weight and acceptable dissolvability. In this study, a novel ultraviolet (UV)-initiated system characterized with adjustable light intensity and redox-azo complex initiator was used to synthesize a CPAM flocculant named NP. Comparatively, another CPAM flocculant named SP with stable UV light intensity and single initiator was prepared. The chemical structure, morphology, and thermal stability were analyzed through instrumental analysis. Proton nuclear magnetic resonance indicated that NP was successfully prepared, and a small fraction of cationic homopolymer was mixed in the product. Polymerization conditions were optimized, and polymerization mechanism was determined by investigating the effects of various parameters on intrinsic viscosity, conversion, and dissolvability. Results showed that the best performance was obtained at indexes of 0.45 wt&permil; redox initiator concentration, 0.2 wt&permil; azo initiator concentration, 40.0 wt% of cationic monomer, first- and second-stage light intensities of 8.5 and 13 mW/cm2, respectively, and 3 wt% urea. Sludge conditioning performances of NP and SP were comparatively evaluated, and the mechanism was determined by investigating the sedimentation behavior and floc size distribution. High intrinsic viscosity, porous morphology structure, and the mixed cationic homopolymer of NP resulted in better sludge conditioning performance.

show abstract

Migration and distribution of sodium ions and organic matters during electro-dewatering of waste activated sludge at different dosages of sodium sulfate

Cited by 47 publications

References 29 publications

Preparation, Characterization, and Sludge Conditioning of Cationic Polyacrylamide Synthesized by a Novel UVA-Initiated System

Preparation, Characterization, and Sludge Conditioning of Cationic Polyacrylamide Synthesized by a Novel UVA-Initiated System

Enhancement of sludge electro-dewaterability during biological conditioning

Preparation, Characterization, and Sludge Conditioning of Cationic Polyacrylamide Synthesized by a Novel UV-Initiated System

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