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<p>The efficiency of engineering construction is directly determined by the quality of mud-water separation. To address the issues of prolonged duration and excessive moisture content in sludge during the existing dewatering process for wall protection slurry, this paper presents the development of a novel compound flocculant. The main findings are as follows: The optimal compositions of novel compound flocculants consist of 1% AlCl<sub>3</sub>, 0.06% anionic polyacrylamide (APAM), and 0.5% Ca(OH)<sub>2</sub>, which can effectively separate approximately 75% of the water while yielding a supernatant with exceptional clarity (only measuring 20 NTU). After 60&#xa0;min of mechanical dewatering, approximately 107&#xa0;mL of filtrate can be discharged. The mechanism test revealed the underlying cause for the enhanced mud-water separation effect of the novel compound flocculant. By combining the characteristics of inorganic and organic flocculants, the novel compound flocculant facilitated a more pronounced rolling and sweeping action on the slurry. Following flocculation, particles larger than 75 μm accounted for approximately 34.9%. The slurry also underwent intensified electrical neutralization, resulting in a significant reduction of the absolute zeta potential to 9.1&#xa0;mV. This highly efficient flocculation process also established favorable conditions for subsequent mechanical dewatering of the slurry. The objective of this paper is to demonstrate the impact of compound flocculants on slurry wall protection and elucidate the synergistic mechanisms of compound flocculants, thereby providing a theoretical foundation for the research and development of novel compound flocculants for engineering wall protection slurry.</p>

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Enhancing Dewatering Efficiency of Wall Protection Slurry Using a Novel AlCl3-APAM-Ca (OH)2 Compound Flocculant: Synergistic Mechanisms and Performance

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Peng Zhang

摘要

The efficiency of engineering construction is directly determined by the quality of mud-water separation. To address the issues of prolonged duration and excessive moisture content in sludge during the existing dewatering process for wall protection slurry, this paper presents the development of a novel compound flocculant. The main findings are as follows: The optimal compositions of novel compound flocculants consist of 1% AlCl3, 0.06% anionic polyacrylamide (APAM), and 0.5% Ca(OH)2, which can effectively separate approximately 75% of the water while yielding a supernatant with exceptional clarity (only measuring 20 NTU). After 60 min of mechanical dewatering, approximately 107 mL of filtrate can be discharged. The mechanism test revealed the underlying cause for the enhanced mud-water separation effect of the novel compound flocculant. By combining the characteristics of inorganic and organic flocculants, the novel compound flocculant facilitated a more pronounced rolling and sweeping action on the slurry. Following flocculation, particles larger than 75 μm accounted for approximately 34.9%. The slurry also underwent intensified electrical neutralization, resulting in a significant reduction of the absolute zeta potential to 9.1 mV. This highly efficient flocculation process also established favorable conditions for subsequent mechanical dewatering of the slurry. The objective of this paper is to demonstrate the impact of compound flocculants on slurry wall protection and elucidate the synergistic mechanisms of compound flocculants, thereby providing a theoretical foundation for the research and development of novel compound flocculants for engineering wall protection slurry.