A novel amphoteric terpolymer P(AM-DAC-AMPS) (PADA) was synthesized with acrylamide (AM), acryloyloxyethyl trimethyl ammonium chloride (DAC) and 2-acrylamido-2-methyl-propane sulfonate (AMPS) by an initiation system composed of a redox type initiator and the Azo initiator in aqueous solution, The reagents were characterized in terms of typical properties, stability and morphological analysis (XRD, FTIR, SEM). The application of PADA for the sludge dewatering of municipal sewage treatment has been carried out compared with cationic polyacrylamide (CPAM). The specific resistance to filtration (SRF), moisture percentage of sludge and chemical oxygen demand (COD) removal efficiency were used to evaluate the sludge dewaterability. The results indicated that new reagents performed better in fine particles capture and in the formation of lager flocs that resulted in a better dewaterability and less dosage of reagent. Furthermore, Mechanism and model of sludge dewatering with PADA have been investigated based on the content of amylose and albumen in the centrifugal filtrate, zeta potential of sludge flocs and SEM observations of sludge flocs. It was also testified that there were ion bonds between PADA and sludge flocs, while hydrogen bonds did little contribution.Keywords : ternary polymerization; amphoteric; sludge dewatering; acryloyloxyethyl trimethyl ammonium chloride; 2-acrylamido-2-methyl-propane-sulfonate * Corresponding author . Tel.: +86 20 38743625;E-mail addresses: jhcheng@scut.edu.cn (J.-h. Cheng)

Synthesis and characteristics of flocculating sludge conditioner:  Novel amphoteric terpolymer PADA

248th National Meeting (2014)

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