Characterization and Evaluation of Dewatering Properties of PADB, a Highly Efficient Cationic Flocculant

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• 作者：Huaili Zheng ; Yongjun Sun ; Jinsong Guo ; Fengting Li ; Wei Fan ; Yong Liao ; Qingqing Guan
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：February 19, 2014
• 年：2014
• 卷：53
• 期：7
• 页码：2572-2582
• 全文大小：616K
• ISSN：1520-5045

文摘

PADB was a highly efficient cationic flocculant, which was synthesized through the copolymerization of acrylamide (AM), acryloyloxyethyl trimethyl ammonium chloride (DAC), and butylacrylate (BA) with ultraviolet initiation by micellar polymerization technology. The PADB was the terpolymer of AM, DAC, and BA. In order to observe this flocculant鈥檚 structural characteristics, nuclear magnetic resonance hydrogen spectroscopy (¹H NMR), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA) were used. The most important study was to analyze its physicochemical parameters during dewatering of activated sludge. These tested parameters included residual turbidity of supernatant, dry solid content (DS), extracellular polymeric substances (EPS), specific resistance to filtration (SRF), 味-potential, floc size, and settling rate. Results demonstrated that the PADB have a superiority over both poly(acrylamide-acryloyloxyethyl trimethyl ammonium chloride) (PAD) and commercially available cationic polyacrylamide (CPAM). However, it was dependent on pH and dosage. A favorable pH was in the neutral range while the appropriate dosage (20 mg路L^鈥?-60 mg路L^鈥?) was crucial to the conditioning process. For the PADB at40 mg路L^鈥? and pH at 7, the residual turbidity of supernatant, DS, SRF, and settling rate could reach 5.5 NTU, 32.2%, 5.51 脳 10¹² m路kg^鈥?, and 3.318 cm路min^鈥?, respectively. During the sludge flocculation process, the charge neutralization mechanism and bridging flocculation played an important role in floc鈥檚 formation and settlement.