Determination of Cationic Degree for Cationic Polyacrylamide and Its Sludge Dewatering Properties

P(AM-DAC-BA) was synthesized by ultraviolet initiation with acrylamide (AM), acryloyloxyethyl trimethyl ammonium chloride (DAC) and butyl acrylate (BA) as monomers and P(AM-DAC) was synthesized with acrylamide and acryloyloxyethyl trimethyl ammonium chloride.The polymer was characterized by Fourier transform infrared (FTIR) spectrum.Cationic degree of P(AM-DAC-BA) was determined by colloid titration and the optimum titration condition: the P(AM-DAC-BA) concentration of 1 × 10 -5 -5 × 10 -5 g g -1 , pH 2-3, titration rate of 0.0653-0.0719mL s -1 , addition of 2-3 drops of toluidine blue as indicator.The sludge dewatering performances of P(AM-DAC-BA) and P(AM-DAC) were also studied and both high solid content and low supernatant turbidity were achieved.The dewatering tests indicated that P(AM-DAC-BA) was better than P(AM-DAC) in sludge dewatering performance.