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<p>A novel coagulant, polyzirconium aluminum silicate (PZAS), was synthesized via a copolymerization method to investigate its effectiveness in enhancing the dewatering performance of residual sludge. The process conditions were systematically optimized, and the structural and morphological properties of the material were thoroughly characterized and analyzed. Based on the one-way experimental results, the optimal conditions were determined as follows: <i>n</i>(Al)/<i>n</i>(Zr) = 5, <i>n</i>(Si)/<i>n</i>(Al + Zr) = 1, <i>n</i>(–OH)/<i>n</i>(Al + Zr) = 0.1, and a dosage of 7.5%. Under these conditions, the minimum values of the dewatering indicators were achieved: cake water content was 78.3%, specific resistance to filtration was 1.44 × 10<sup>12</sup>&#xa0;m/kg, and CST was 21.1&#xa0;s.</p><p>Subsequently, response surface methodology was employed to further optimize the synthesis parameters. The factors and levels selected were: <i>n</i>(Al)/<i>n</i>(Zr) at 3, 4, and 5; <i>n</i>(Si)/<i>n</i>(Al + Zr) at 0.8, 1.0, and 1.2; and n(–OH)/n(Al + Zr) at 0.05, 0.1, and 0.15. With CST as the response variable, the optimized conditions were identified as <i>n</i>(Al)/<i>n</i>(Zr) = 4, <i>n</i>(Si)/<i>n</i>(Al + Zr) = 1.2, <i>n</i>(–OH)/<i>n</i>(Al + Zr) = 0.1, and a dosage of 7.5%. Under these optimized parameters, the CST was further reduced to 35.4&#xa0;s, and the specific resistance to filtration reached its lowest value. The structural and morphological characteristics of the PZAS coagulant were characterized by FT-IR, SEM, and XRD. FT-IR analysis confirmed the formation of abundant functional groups, such as Zr–O–Si and Zr–O, indicating the successful synthesis of the material. High-magnification SEM images revealed a folded surface morphology with a complex architecture, presenting a three-dimensional polymeric network. This structure was attributed to a complicated polymerization process, which contributes to an enhanced adsorption bridging capacity. Furthermore, XRD results verified the amorphous nature of the polymer, which aids in improving coagulation performance.</p>

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Preparation of Aluminum Zirconium Polysilicate Sulfate Coagulant and its Performance on Sludge Dewatering

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Sen Wang,
  • Ping Song,
  • Jiaqi Dang,
  • Shuai Liu,
  • Hongtai Lin

摘要

A novel coagulant, polyzirconium aluminum silicate (PZAS), was synthesized via a copolymerization method to investigate its effectiveness in enhancing the dewatering performance of residual sludge. The process conditions were systematically optimized, and the structural and morphological properties of the material were thoroughly characterized and analyzed. Based on the one-way experimental results, the optimal conditions were determined as follows: n(Al)/n(Zr) = 5, n(Si)/n(Al + Zr) = 1, n(–OH)/n(Al + Zr) = 0.1, and a dosage of 7.5%. Under these conditions, the minimum values of the dewatering indicators were achieved: cake water content was 78.3%, specific resistance to filtration was 1.44 × 1012 m/kg, and CST was 21.1 s.

Subsequently, response surface methodology was employed to further optimize the synthesis parameters. The factors and levels selected were: n(Al)/n(Zr) at 3, 4, and 5; n(Si)/n(Al + Zr) at 0.8, 1.0, and 1.2; and n(–OH)/n(Al + Zr) at 0.05, 0.1, and 0.15. With CST as the response variable, the optimized conditions were identified as n(Al)/n(Zr) = 4, n(Si)/n(Al + Zr) = 1.2, n(–OH)/n(Al + Zr) = 0.1, and a dosage of 7.5%. Under these optimized parameters, the CST was further reduced to 35.4 s, and the specific resistance to filtration reached its lowest value. The structural and morphological characteristics of the PZAS coagulant were characterized by FT-IR, SEM, and XRD. FT-IR analysis confirmed the formation of abundant functional groups, such as Zr–O–Si and Zr–O, indicating the successful synthesis of the material. High-magnification SEM images revealed a folded surface morphology with a complex architecture, presenting a three-dimensional polymeric network. This structure was attributed to a complicated polymerization process, which contributes to an enhanced adsorption bridging capacity. Furthermore, XRD results verified the amorphous nature of the polymer, which aids in improving coagulation performance.