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<p>Anaerobic digested sludge (ADS) exhibits poor dewaterability, making treatment necessary before deep dewatering. Among various physical treatment methods, freeze–thaw (F/T) treatment has been recognized as an effective and environmentally friendly approach to enhance excess sludge dewaterability, thereby reducing chemical demand and mitigating environmental risks. This study investigated the influence of F/T treatment at different freezing temperatures on the dewaterability of ADS. The results demonstrate that F/T treatment effectively reduced moisture content, capillary suction time, and specific resistance filtration. The best performance was achieved at − 20&#xa0;°C, where specific resistance filtration and capillary suction time decreased by 50.25 and 88.40%, respectively. F/T treatment promotes the precipitation of organic matter and disrupts the sludge floc structure. As the freezing temperature decreased, the median particle size initially declined and subsequently increased. At temperatures below − 20&#xa0;°C, phase transitions among different water states further enhanced water mobility within the sludge. ADS dewaterability can be effectively enhanced through F/T treatment.</p> Graphical Abstract <p></p>

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Enhanced Dewaterability of Anaerobic Digested Sludge by Freeze-Thaw Treatment at Different Temperatures

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Tianfeng Wang,
  • Xiangting Shi,
  • Jinghan Zhang,
  • Yuqian Zhang,
  • Cheng Peng,
  • Huiping Zhou,
  • Wenqi Gao,
  • Youfei Zhou

摘要

Anaerobic digested sludge (ADS) exhibits poor dewaterability, making treatment necessary before deep dewatering. Among various physical treatment methods, freeze–thaw (F/T) treatment has been recognized as an effective and environmentally friendly approach to enhance excess sludge dewaterability, thereby reducing chemical demand and mitigating environmental risks. This study investigated the influence of F/T treatment at different freezing temperatures on the dewaterability of ADS. The results demonstrate that F/T treatment effectively reduced moisture content, capillary suction time, and specific resistance filtration. The best performance was achieved at − 20 °C, where specific resistance filtration and capillary suction time decreased by 50.25 and 88.40%, respectively. F/T treatment promotes the precipitation of organic matter and disrupts the sludge floc structure. As the freezing temperature decreased, the median particle size initially declined and subsequently increased. At temperatures below − 20 °C, phase transitions among different water states further enhanced water mobility within the sludge. ADS dewaterability can be effectively enhanced through F/T treatment.

Graphical Abstract