Influence of feedstock and hydrothermal duration on the characteristics of agricultural waste based hydrochar and the derived DOM for the contaminated farmland remediation potentials

文献类型： 外文期刊

第一作者： Gu, Wenjie

作者： Gu, Wenjie;Lu, Yusheng;Shi, Chaohong;Xie, Kaizhi;Wang, Dan;Liu, Chong;Peng, Huanlong;Zhang, Kun;Li, Yaying;Gu, Wenjie;Lu, Yusheng;Shi, Chaohong;Xie, Kaizhi;Wang, Dan;Liu, Chong;Peng, Huanlong;Zhang, Kun;Li, Yaying;Gu, Wenjie;Gu, Wenjie;Li, Yaying;Qiu, Rongliang;Qiu, Rongliang

作者机构：

关键词： Hydrochar; Hydrothermal duration; Dissolved organic matter; Agricultural waste; Biotoxicity

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN： 2352-1864

年卷期： 2025 年 38 卷

页码：

收录情况： SCI

摘要： Hydrothermal carbonization (HTC) offers a sustainable pathway to convert agricultural wastes into multifunctional hydrochars, yet the stability of hydrochars and the biotoxicity of hydrocharderived dissolved organic matter (DOM) as amendments for contaminated farmland soils remained understudied. Herein, this study investigates feedstock-dependent (straw: HS, swine manure: HSM, and cattle manure: HCM) and time-resolved variations in hydrochar and the derived DOM characteristics for farmland remediation potentials. Feedstock type dominated hydrochars and DOM functionality that manure-based hydrochars exhibited superior metal adsorption capacity (100 % Pb removal by HSM and 51.7-76.2 % by HCM), more biologically suitable C/N ratios (HSM: 15.0-16.5, HCM: 21.4-23.5), and germination index (HSM: 51.1-76.7 %, HCM: 56.2-82.2 %), correlating with the reduced phytotoxicity. The DOM derived from manure-based hydrochar contained more macromolecular fluorescent humus contents and various organic functional groups, while HS released more phytotoxic DOM with 44.3-68.3 % germination inhibition. DOM removal enhanced Pb adsorption capacities by 56.1-97.3 % for lignocellulose-rich HS. With elemental analysis and 2D-FTIR-COS analysis, the prolonged hydrothermal duration enhanced structural stability, reducing DOM release by 19.6-40.5 % through dehydration and decarboxylation. In addition, the stability of hydrochar, alongside the N content and the degree of dehydration and decarboxylation, significantly affected their toxicity to seed germination. In conclusion, the type of feedstock has the most substantial impact on hydrochars and DOM properties that HCM emerged as the most viable candidate due to synergistic benefits, while optimizing hydrothermal time improved performance agricultural remediation.

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