Acid/alkali-assisted hydrothermal valorization of brewer's spent grain: Insights from element distribution and product potential

文献类型： 外文期刊

第一作者： Xu, Tianle

作者： Xu, Tianle;Chen, Mingjie;Meng, Xiang;Leng, Lijian;Li, Hailong;Zhan, Hao;Xu, Tianle;Kuang, Wei;Zhang, Shihui;Li, Dejun;Xu, Tianle

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关键词： Brewer's Spent Grain (BSG); Hydrothermal processing; Ca(OH) 2 additive; Carbon and nitrogen distribution; Solid biofuel; Liquid biofertilizer

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：10.0； 五年影响因子：10.7 ）

ISSN： 0959-6526

年卷期： 2025 年 519 卷

页码：

收录情况： SCI

摘要： Brewer's spent grain (BSG), a high-moisture, protein-rich lignocellulosic biowaste, offers significant renewable resource potential despite its challenging waste attributes. This study innovates an acid/alkali-assisted hydrothermal processing strategy for simultaneous solid-liquid valorization of BSG into energy-dense biofuels and nutrient-rich biofertilizer. Through a dual-phase experimental design, we decoupled the synergistic effects of process parameters and additives (H2SO4, Ca(OH)2) on carbon-nitrogen phase partitioning and functional enhancement. At optimized conditions (180 degrees C, 45 min), the system achieved 57 wt% carbon in hydrochar alongside 4 wt% nitrogen fixation, with the liquid phase concentrating 1419 +/- 50.92 mg L- 1 dissolved carbon and 233 +/- 9.67 mg L- 1 bioavailable nitrogen. Additive dosage critically governed molecular restructuring: stabilizing C=C bonds and pyridinic-N/pyrrolic-N moieties in solids while preserving non-phytotoxic nitrogenous organics in liquids. Consequently, additive-enhanced hydrochar exhibited higher combustion stability, improved thermal reactivity, and suppressed emissions of inert and nitrogen-containing gases, whereas the hydrolysate accelerated seed gemination rate and biomass accumulation in rice seedlings, rivaling urea efficacy. Notably, Ca(OH)2 emerged as the superior additive, achieving dual enhancements of biofuel and biofertilizer metrics. This work establishes a carbon-nitrogen decoupling-reconfiguration paradigm, offering a scalable blueprint for nitrogen-rich biomass valorization in circular bioeconomy.

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