Hydrothermal carbonization aqueous phase applied to the rice paddy: Interaction between soil DOM and bacterial community on runoff water quality

文献类型： 外文期刊

第一作者： Feng, Yuanyuan

作者： Feng, Yuanyuan;Feng, Yuanyuan;He, Huayong;Wang, Lisha;Ji, Yahui;Chen, Bingfa;He, Shiying;Feng, Yanfang;Xue, Lihong;Wang, Bingyu;Xing, Baoshan

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关键词： Sewage sludge hydrothermal carbonation; Artificial dissolved organic matter; Molecular composition; ESI-FT-ICR MS; Water quality

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 512 卷

页码：

收录情况： SCI

摘要： Hydrothermal carbonization (HTC), an advanced technology for wet biomass valorization, is increasingly applied to resource recovery from organic wastes such as sewage sludge. The HTC aqueous phase (HAP) has been identified as a promising artificial dissolved organic matter (DOM) for soil amendment. However, the environmental behavior of HAP, particularly sewage sludge-derived HAP (SHAP), within paddy fields and its cascading effects on the "soil DOM-soil microbiota-water quality" system remain largely unexplored. Herein, SHAP and HAP derived from another typical municipal waste (i.e., kitchen waste) (KHAP) were applied in varying proportions to the water-soil interface of paddy fields to comparatively evaluate their impacts on soil DOM, soil bacterial communities and water quality. Through Fourier transform ion cyclotron resonance mass spectrometry, we revealed that HAP application induced significant molecular restructuring of soil DOM, with a 4.0-13.3% increase in the number and a 4.0-20.1% enhancement in the intensity of CHON compounds, primarily driven by microbial-mediated biogeochemical processes. Variance partitioning analysis demonstrated that interactions between soil DOM and microbiota accounted for 72.5% of the variance in water quality parameters (e.g., total nitrogen, chemical oxygen demand (COD), and dissolved oxygen). SHAP exhibited superior aquatic compatibility compared to KHAP, showing a 23.9% reduction in COD loads compared to KHAP at low-dose conditions (150 mL). The proposed strategy, which integrates optimized HAP feedstock selection (prioritizing sewage sludge), application dosage (<= 150 mL), and hydraulic retention (>= 7 days), delivers synergistic benefits in non-point source pollution mitigation. This approach advances the eco-safe application of SHAP in addressing critical aquatic environmental challenges in paddy fields, aligning with the broader goals of sustainable water resource management.

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