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<p>Sediments from eutrophic lakes are common, and the effective utilization of dredged sludge-cake (DS-C) remains a significant challenge. This study proposes a method for utilizing DS-C as a substrate for submerged plant restoration, aiming to achieve in situ resource recycling. In this study, a field experiment was conducted in Meiliang Bay, Lake Taihu, to evaluate the feasibility of using DS-C as a plant substrate. Water quality and DS-C properties were regularly monitored, and indoor simulation experiments were designed to examine changes in the mechanical properties of DS-C during underwater utilization. The findings revealed that the chemical properties of DS-C remained stable during underwater utilization, with no evidence of secondary pollution. A short-term increase in turbidity, total nitrogen (TN), and total phosphorus (TP) was observed after backfilling, which returned to baseline levels within 15&#xa0;days. Secondary softening of the DS-C was noted, characterized by increased water content and decreased mechanical strength. The softened DS-C exhibited low strength, making it challenging to anchor plant roots effectively under wind- and wave-induced disturbances, often leading to plant uprooting and mortality. The study emphasizes that when DS-C is used as a plant substrate, its mechanical strength must be enhanced through appropriate dewatering pretreatment to support plant growth. Additionally, the potential release of organic matter, nitrogen, and phosphorus from DS-C requires long-term monitoring and management.</p>

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Secondary softening and short-term water quality impacts of dredged sludge-cake used as a substrate for submerged plant restoration: a field experiment

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Yichao Wang,
  • Naixi Lin,
  • Yuxing Zhu,
  • Wangxin Li,
  • Xinyi Wang,
  • Tao Sheng,
  • Nuo Chen,
  • Wei Zhu

摘要

Sediments from eutrophic lakes are common, and the effective utilization of dredged sludge-cake (DS-C) remains a significant challenge. This study proposes a method for utilizing DS-C as a substrate for submerged plant restoration, aiming to achieve in situ resource recycling. In this study, a field experiment was conducted in Meiliang Bay, Lake Taihu, to evaluate the feasibility of using DS-C as a plant substrate. Water quality and DS-C properties were regularly monitored, and indoor simulation experiments were designed to examine changes in the mechanical properties of DS-C during underwater utilization. The findings revealed that the chemical properties of DS-C remained stable during underwater utilization, with no evidence of secondary pollution. A short-term increase in turbidity, total nitrogen (TN), and total phosphorus (TP) was observed after backfilling, which returned to baseline levels within 15 days. Secondary softening of the DS-C was noted, characterized by increased water content and decreased mechanical strength. The softened DS-C exhibited low strength, making it challenging to anchor plant roots effectively under wind- and wave-induced disturbances, often leading to plant uprooting and mortality. The study emphasizes that when DS-C is used as a plant substrate, its mechanical strength must be enhanced through appropriate dewatering pretreatment to support plant growth. Additionally, the potential release of organic matter, nitrogen, and phosphorus from DS-C requires long-term monitoring and management.