UV‐Initiated Polymerization of Cationic Polyacrylamide: Synthesis, Characterization, and Sludge Dewatering Performance

Abstract

P(AM-DAC-BA) was synthesized through copolymerization of acrylamide (AM), acryloyloxyethyl trimethyl ammonium chloride (DAC), and butylacrylate (BA) under ultraviolet (UV) initiation using response surface methodology (RSM). The influences of light intensity, illumination time, and photoinitiator concentration on the intrinsic viscosity [η] of P(AM-DAC-BA) were investigated. RSM model based on the influencing data was established for optimizing synthetic conditions. It was found that, at light intensity 1491.67 μw·cm−2, illumination time 117.89 min, and photoinitiator concentration 0.60‰, there was a better material performance achieved. Thus P(AM-DAC-BA) prepared under the above conditions showed excellent dewatering performance that, with 40 mg·L−1 P(AM-DAC-BA) at pH 7, the residual turbidity of supernatant and the dry solid content were up to 38 NTU, 28.5%, respectively.

Effective sludge dewatering technique using the combination of Fenton's reagent and CPAM

“…The concentrations of protein and polysaccharide were used as an index to measure the degree of EPS degradation . The Fenton reaction system generated hydroxyl radicals (•OH) with the existence of H 2 O 2 and the catalysis of Fe 2+ under acidic conditions, and the amount of Fe 2+ and H 2 O 2 directly influenced the production of •OH . The generation of hydroxyl radicals (•OH) was deficient under low H 2 O 2 concentration, which inhibited the effect of sludge dewatering.…”

Assessing the Efficacy of Sodium Alginate and Polyacrylamide as Spray Adjuvants Combined with Bifenthrin and Imidacloprid against Lygus lineolaris and Piezodorus guildinii

“…However, it does not exhibit appreciable increases in viscosity at higher doses. PAM is used in the water and wastewater treatment industry as a flocculant [35,36], soil conditioning and erosion control agent [37][38][39], and in the oil and gas industry [40]. However, high levels of acrylamide in PAM have been associated with cancer in laboratory animals and are reasonably anticipated to be a human carcinogen [41,42].…”