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<p>To keep the river/lake sustainability and ecology, the massively dredged sediments face the waste’s volume reduction challenge. Since the traditional vacuum preloading (TVP) methods often exhibit the long dewatering period and inadequate improvement efficiency, the heat-assisted vacuum preloading (HAVP) has been proposed to overcome the inadequacy. In this study, a model setup was developed to compare the efficiency of the proposed HAVP and the TVP in treating dredged recent river/lake sediment. The results indicate that the HAVP significantly enhances the dewatering efficiency than TVP, resulting in about 20%, 16% and 20% increase in dewatering volume, settlement and strength, respectively, and a maximum decrease of 15.4% in the final water content. The heating process disrupts the sludge floc induced by the bio-cell structures, releasing bound water into free one that could be easily discharged, thereby enhancing the dewatering efficiency. Despite the energy consumption by the heat introduction, the vacuum efficiency, resulting in a notable improvement in quality than TVP, makes HAVP a cost-effective approach for the disposal of the organo-enriched recent river/lake sediments. Moreover, this study also updates the thermo-consolidation model considering the microbial degradation effect, clarifying the heat-assisted consolidation mechanism.</p>

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Dewatering efficiency of heat-assisted vacuum preloading for organic-rich river/lake sediments

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Wei Yuan,
  • Zi Ying,
  • Yundong Zhang,
  • Qi Feng,
  • Yongfeng Deng

摘要

To keep the river/lake sustainability and ecology, the massively dredged sediments face the waste’s volume reduction challenge. Since the traditional vacuum preloading (TVP) methods often exhibit the long dewatering period and inadequate improvement efficiency, the heat-assisted vacuum preloading (HAVP) has been proposed to overcome the inadequacy. In this study, a model setup was developed to compare the efficiency of the proposed HAVP and the TVP in treating dredged recent river/lake sediment. The results indicate that the HAVP significantly enhances the dewatering efficiency than TVP, resulting in about 20%, 16% and 20% increase in dewatering volume, settlement and strength, respectively, and a maximum decrease of 15.4% in the final water content. The heating process disrupts the sludge floc induced by the bio-cell structures, releasing bound water into free one that could be easily discharged, thereby enhancing the dewatering efficiency. Despite the energy consumption by the heat introduction, the vacuum efficiency, resulting in a notable improvement in quality than TVP, makes HAVP a cost-effective approach for the disposal of the organo-enriched recent river/lake sediments. Moreover, this study also updates the thermo-consolidation model considering the microbial degradation effect, clarifying the heat-assisted consolidation mechanism.