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
作者： Lin, Qingqi 1 ; Chen, Run 1 ; Zhu, Yanping 1 ; Li, Danning 1 ; Gu, Wenjie 1 ; Lu, Yusheng 1 ; Shi, Chaohong 1 ; Xie, Kaizhi 1 ; Wang, Dan 1 ; Liu, Chong 1 ; Peng, Huanlong 1 ; Zhang, Kun 1 ; Li, Yaying 1 ; Ni, Zhuobiao 1 ; Qiu, Rongliang 5 ;
作者机构： 1.South China Agr Univ, Coll Nat Resources & Environm, Guangdong Lab Lingnan Modern Agr, Guangdong Prov Key Lab Agr & Rural Pollut Abatemen, Guangzhou 510642, Peoples R China
2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Plant Nutr & Fertilizer South Reg, Guangdong Prov Key Lab Nutrient Cycling & Farmland, Guangdong Prov Engn Res Ctr Soil Microbes & Cultiv, Guangzhou 510640, Peoples R China
4.Maoming Branch, Guangdong Lab Lingnan Modern Agr, Maoming 525000, Peoples R China
5.Guangdong Acad Agr Sci, State Key Lab Swine & Poultry Breeding Ind, Guangzhou 510640, Peoples R China
6.Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China
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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