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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2026, Vol. 45 ›› Issue (1): 227-236.DOI: 10.16552/j.cnki.issn1001-1625.2025.0703

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Effects of PAM Flocculants on Dewatering Performance of Waste Pile Foundation Slurry

XUE Nanbo1(), CHEN Weiwei2, YAN Weijie1, XIA Libin1,3()   

  1. 1. School of Energy and Mechanical Engineering,Jiangxi University of Science and Technology,Nanchang 330013,China
    2. Jiangxi Provincial Transportation Planning and Design Institute,Nanchang 330001,China
    3. School of Chemistry and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China
  • Received:2025-07-18 Revised:2025-09-15 Online:2026-01-20 Published:2026-02-10

Abstract:

Large amounts of waste pile foundation slurries generated from bridge and road construction exhibit high water content and fine particle size, making direct disposal prone to causing severe environmental pollution. Flocculation and dewatering represent a crucial step for the efficient treatment and resource utilization of the waste pile foundation slurry. In this study, polyacrylamide (PAM) flocculants were employed to investigate the dewatering performance of waste slurry, which is derived from a bridge pile foundation project in Jiangxi Province, China. Comparative analyses were conducted on the changes in slurry structure, morphology and particle size before and after flocculation. The results indicate that anionic PAM (APAM), cationic PAM (CPAM) and non-ionic PAM (NPAM) all achieve optimal dewatering effectiveness at a concentration of 0.2% (mass fraction). 3%, 4% and 7% (volume fraction) of these flocculants can induce rapid flocculation and dewatering within 10 s, significantly reducing the water content by 29.5%, 24.3% and 19.5%, respectively. Among them, APAM demonstrates the best treatment performance, yielding a supernatant turbidity of only 20 NTU after 2 h. APAM effectively agglomerates fine particles into larger flocs, markedly enhancing the crystallinity of slurry. The characteristic particle size values (D10D50D90) all increase substantially, particularly the D90, which surges from 15.10 μm to 25.50 μm (an increase of 68.9%). In conclusion, APAM exhibits excellent flocculation and dewatering capabilities, showing promising application potential for the environmentally sound treatment of waste pile foundation slurry.

Key words: waste pile foundation slurry, resource utilization, polyacrylamide flocculant, dewatering performance, rapid flocculation and dewatering

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