Characterization and sludge dewaterability evaluation of a chitosan‐based flocculant CMCTS‐g‐CPAM

In this work, a new cationic flocculant, CMCTS‐g‐CPAM was synthesized by acrylamide (AM), methacryloyloxyethyltrimethylammonium chloride (DMC) and carboxymethyl chitosan (CMCTS) through UV initiated graft polymerization techniques. The structure of CMCTS‐g‐CPAM was analysed by infrared spectroscopy...

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Bibliographic Details
Published in:Water and environment journal : WEJ 2020-12, Vol.34 (S1), p.390-400
Main Authors: Sun, Wenquan, Zhu, Hui, Sun, Yongjun, Tang, Mengdan, Zheng, Huaili
Format: Article
Language:English
Subjects:
Acrylamide
Analytical methods
Cations
Chitosan
chitosan‐based flocculant
Dewatering
Electron micrographs
Filter cake
Flocculants
flocculation
Hydrophobicity
Infrared analysis
Infrared spectroscopy
Magnetic resonance spectroscopy
Moisture content
NMR
NMR spectroscopy
Nuclear magnetic resonance
pH effects
Polymerization
Sludge
sludge conditioning
Sludge drying
Spectrum analysis
Turbidity
Viscosity
Water content
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Summary:In this work, a new cationic flocculant, CMCTS‐g‐CPAM was synthesized by acrylamide (AM), methacryloyloxyethyltrimethylammonium chloride (DMC) and carboxymethyl chitosan (CMCTS) through UV initiated graft polymerization techniques. The structure of CMCTS‐g‐CPAM was analysed by infrared spectroscopy (IR), nuclear magnetic resonance spectroscopy (1H NMR) and X‐ray diffraction (XRD) techniques which indicates that AM and DMC are grafted successfully onto CMCTS to obtain CMCTS‐g‐CPAM. The potential of CMCTS‐g‐CPAM for the sludge dewatering was investigated. The effects of cationic degree, intrinsic viscosity, dosage and pH on the sludge dewatering performance were studied. The results indicate that the optimal dewatering performance with minimum supernatant turbidity of 5.40 NTU, the moisture content of the filter cake of 79.28% and the specific resistance of the sludge of 1.96 × 1013 m/kg was obtained at 30 mg/L CMCTS‐g‐CPAM at pH 9–10. Finally, from the microscopic and electron micrographs investigation, it was confirmed that the particle size of the CMCTS‐g‐CPAM treated sludge was significantly large to enhance hydrophobicity and improve dewatering performance.
ISSN:1747-6585
1747-6593
DOI:10.1111/wej.12536