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Using bio-based CaCO3 functionalized sediment to simultaneously remove algae and COD through adsorption and sedimentation in water source reservoirs

Turbid waters clear,
Bio-CaCO₃ binds the green,
Clean lake, calm and still.
Micro-nano CaCO~3~
Sediment modification
Response surface
Extracellular polymeric substances (EPS)
XDLVO

WR2026: Yifan Du, Jinyi Qin, Ming Su, et. al. Using bio-based CaCO3 functionalized sediment to simultaneously remove algae and COD through adsorption and sedimentation in water source reservoirs. Water Research 2026;288:124584. 10.1016/j.watres.2025.124584.

作者
单位

杜 一凡

School of Civil Engineering, Chang’an University

Key Laboratory of Environmental Aquatic Chemistry, State Key Laboratory of Regional Environment and Sustainability, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

赵 金波

School of Civil Engineering, Chang’an University

Key Laboratory of Environmental Aquatic Chemistry, State Key Laboratory of Regional Environment and Sustainability, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

王 清平

School of Civil Engineering, Chang’an University

冯 加成

School of Civil Engineering, Chang’an University

秦 晋一

School of Civil Engineering, Chang’an University

Key Laboratory of Environmental Aquatic Chemistry, State Key Laboratory of Regional Environment and Sustainability, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

苏 命

Key Laboratory of Environmental Aquatic Chemistry, State Key Laboratory of Regional Environment and Sustainability, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

University of Chinese Academy of Sciences

发布于

2025年09月10日

Doi

10.1016/j.watres.2025.124584

Introduction by AI

Abstract

In-situ turbidity enhancement can suppress algal growth in reservoirs but often exacerbates chemical oxygen demand (COD) accumulation due to incomplete organic removal. This study presents a biologically synthesized bio-CaCO3-modified sediment, engineered via Bacillu s-induced carbonate precipitation, to simultaneously control algae and reduce COD. The material forms 15–30 nm core–shell clusters with enriched –OH/–COOH groups and mesopores (~19.76 nm), confirmed by SEM, XRD, FTIR, and BET (+1.02 m2 g-1). Adsorption tests against Microcystis aeruginosa, Chlorella, and Limnothrix showed Langmuir-type monolayer binding (R2 > 0.97) and pseudo-second-order kinetics. XDLVO theory and DFT analysis revealed strong EPS–Bio-CaCO3 interactions (\(\Delta E_\text{AB}\) = 31.28 mJ m-2; \(\Delta E_\text{ads}\) = –1.07 ev). Optimal conditions (7.5 wt% CaCO3, 56% residual Ca2+, 85 min) achieved 93.8% Chl-a removal, 88.6% COD reduction, and 87.5% turbidity control (R2 = 0.98), with minimal Ca2+ leaching. By integrating chemisorption, interfacial adhesion, and pore confinement, this material provides a stable, eco-friendly strategy for dual pollutant control and in-situ sediment remediation.

Graphical abstract

Citation

Add to Zotero 

@Article{du2026using,
    title       = {Using bio-based CaCO3 functionalized sediment to simultaneously remove algae and COD through adsorption and sedimentation in water source reservoirs},
    author      = {Yifan Du and Jinbo Zhao and Qingping Wang and Jiacheng Feng and Jinyi Qin and Ming Su},
    year        = 2026,
    journal     = {Water Research},
    volume      = 288,
    pages       = 124584,
    url         = {https://www.sciencedirect.com/science/article/pii/S0043135425014873},
    issn        = {0043-1354},
    doi         = {10.1016/j.watres.2025.124584}
}