Temperature-dependent performance of dual-layer capping for nutrient control in Lake Hashenge sediments

Abstract Tegegne BM, Birhane E, Eregno FE, Haaland SL, Alemayehu S, Gebretsadik TT, Asgedom AG. 2025. Temperature-dependent performance of dual-layer capping for nutrient control in Lake Hashenge sediments. Lake Reserv Manage. 41:222–238. Capping is an effective method for reducing internal nutrient loading in eutrophic water bodies, but research on low-cost materials, especially for trapping nitrogen and phosphorus, remains limited. This study evaluates the performance of a dual-layer biochar and zeolite capping system in mitigating nutrient fluxes. The structural and compositional properties of the materials were characterized using advanced techniques such as scanning electron microscopy, electron diffraction spectroscopy, and Raman spectroscopy. Three setups at 16 C and 24 C were tested for 60 d: (1) uncapped sediment, (2) nonwoven fabric mat (NWFM) with zeolite over biochar, and (3) NWFM with biochar over zeolite. Both capping configurations significantly reduced ammonium-nitrogen flux. The zeolite-on-top setup achieved the lowest total nitrogen flux at 16 C (1.03 mg/m2/d), while uncapped sediment had the highest at 24 C (5.02 ± 1.36 mg/m2/d). Zeolite at the top layer enhanced nutrient retention—up to 95% ammonium and 98% phosphorus—while maintaining dissolved oxygen and reducing chemical oxygen demand. These results highlight the short-term efficacy of dual-layer capping as a cost-effective approach for lake restoration. Further field-scale studies are recommended to assess long-term outcomes.

• Publication year

  2025

• Venue

  Lake and reservoir management

• Publication date

  2025-07-03

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1080/10402381.2025.2524736
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

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• No concepts are published for this paper.

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