Study on the regulation of sludge dewatering by hydrophobically associating cationic polyacrylamide coupled with framework materials

“Water-in-water” emulsions of hydrophobically associating cationic polyacrylamide (HACPAM) with both cationic groups (methacrylatoethyl trimethyl ammonium chloride, DMC) and hydrophobic groups (n-butyl acrylate, BA) were synthesized by dispersion polymerization. The structure of the copolymer was confirmed by FTIR and 1HNMR. The prepared “water-in-water” emulsions possessed high solid content, low viscosity, good stability and solubility. An image analyzer photographed the size of the emulsion particles. The polymerization behaviors with varying concentrations of acrylamide, DMC, BA, stabilizer and reaction time were investigated. Appropriate concentrations of monomer, BA and DMC for stable dispersion system were in the scope of 10~15 wt%, 0.025 ~ 0.15 wt% and 1~ 4 wt%, respectively. The dynamic drainage experiment results show that the HACPAM “water-in-water” emulsions can be directly used as retention aid and obviously improve the retention efficiency of bleached broad-leaved pulp.

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Relationship between the Characteristics of Cationic Polyacrylamide and Sewage Sludge Dewatering Performance in a Full-Scale Plant

Procedia Environmental Sciences ◽

10.1016/j.proenv.2012.10.057 ◽

2012 ◽

Vol 16 ◽

pp. 409-417 ◽

Cited By ~ 11

Author(s):

Jiawei Wang ◽

Chen Chen ◽

Qiong Gao ◽

Tong Li ◽

Fenfen Zhu

Keyword(s):

Sewage Sludge ◽

Full Scale ◽

Sludge Dewatering ◽

Cationic Polyacrylamide

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Synthesis and Application of Hydrophobically Associating Cationic Polyacrylamide

Asian Journal of Chemistry ◽

10.14233/ajchem.2014.15948 ◽

2014 ◽

Vol 26 (13) ◽

pp. 3769-3773 ◽

Cited By ~ 1

Author(s):

Y.J. Sun ◽

H.L. Zheng ◽

M.Z. Tan ◽

J.Y. Ma ◽

W. Fan ◽

...

Keyword(s):

Cationic Polyacrylamide ◽

Hydrophobically Associating

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Enhancement of Waste Activated Sludge Dewaterability by Potassium Ferrate Pretreatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1073-1076.937 ◽

2014 ◽

Vol 1073-1076 ◽

pp. 937-940 ◽

Cited By ~ 2

Author(s):

Xiao Rong Kang ◽

Ya Li Liu

Keyword(s):

Activated Sludge ◽

Optimal Dose ◽

Soluble Proteins ◽

Waste Activated Sludge ◽

Potassium Ferrate ◽

Sludge Dewatering ◽

Cationic Polyacrylamide ◽

Floc Structure ◽

Sludge Dewaterability

Potassium ferrate was used to enhance sludge dewatering and the mechanism was studied. Sludge floc structure was effectively destroyed by potassium ferrate, and the soluble COD, proteins and polysaccharides increased with the increase of potassium ferrate. The optimal dose for sludge disintegration was 100 mg/gSS, and the corresponding maximal SCOD, soluble proteins and polysaccharides concentrations were 2455, 800 and 145 mg/L, respectively. Sludge dewaterability was enhanced significantly with cationic polyacrylamide (C-PAM) application, and the SRF decreased to 0.72×1010m/kg from 50.12×1010m/kg. This study indicated that the potassium ferrate pretreatment was helpful for enhancing sludge dewaterability and reducing the coagulant dose.

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