Synthesis of encapsulated nanofertilizer from biogas plant digestate

Q1 Environmental Science Bioresource Technology Reports Pub Date : 2025-02-01 Epub Date: 2024-12-08 DOI:10.1016/j.biteb.2024.102009

Edward D. Nasser , Joel Kenneth M. Ngojo , Ramiro Emerson C. Amon , Jayvee Moore S. Dy , Julius J. Rosalia , Chosel P. Lawagon

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Abstract

Biogas digestate, though nutrient-rich, is underutilized due to its unpleasant odor and limited efficacy as fertilizer. This study synthesized an encapsulated nanofertilizer (ENF) using polyurethane (PU) to enhance nutrient release control. Nitrate release studies showed that ENF delayed significant nutrient release to 10.57 days, aligning with controlled-release fertilizer standards by achieving a maximum of 65 % nutrient release over 30 days. Nutrient release kinetics fitted the Korsmeyer-Peppas model (R² = 0.9984), confirming diffusion-controlled Fickian release and a matrix-based system. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) analysis confirmed the matrix structure, while Fourier Transform Infrared Spectroscopy (FTIR) verified the successful synthesis of PU coating. These findings suggest that encapsulated nanofertilizer improves nutrient release profiles, offering a sustainable solution for digestate valorization.

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以植物沼液为原料合成胶囊化纳米肥料

沼气消化池虽然营养丰富，但由于其难闻的气味和有限的肥料功效而未得到充分利用。本研究以聚氨酯（PU）为原料，合成了一种胶囊化的纳米肥料（ENF），以加强养分的释放控制。硝酸盐释放研究表明，ENF将显著的养分释放延迟至10.57天，符合控释肥料标准，在30天内达到65%的养分释放。养分释放动力学符合Korsmeyer-Peppas模型（R2 = 0.9984），证实了扩散控制的Fickian释放和基于基质的系统。扫描电子显微镜与能量色散x射线能谱（SEM-EDX）分析证实了基体结构，傅里叶变换红外光谱（FTIR）验证了PU涂层的成功合成。这些发现表明，包封的纳米肥料改善了营养物质的释放，为消化系统的增值提供了一个可持续的解决方案。

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