期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 128, 期 -, 页码 314-323出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2017.09.019
关键词
Slow-release N fertilization; Hygienization; Pyrochar; Hydrochar; Solid-state NMR spectroscopy
资金
- Spanish Ministry of Economy and Competitiveness [PCGL2012-37041, CGL2015-64811-P, CGL2016-76498-R]
- Spanish Ministry of Education, Culture and Sport (Marina Paneque FPU fellowship) [FPU 13/05831]
Hygienization by thermochemical carbonization may be one option to enable the use of sewage sludge (SS) as soil amendment and nitrogen (N) fertilizer. To evaluate this possibility, SS derived from different water purification processes of a rural waste water treatment plant were hydrothermal carbonized (HTC) at 200 and 260 degrees C for 0.5 and 3.0 h, and pyrolyzed at 600 degrees C for 1 h. During HTC, temperature rather than residence time affected the chemical alteration. Solid-state C-13 and N-15 nuclear magnetic resonance (NMR) spectroscopy showed considerably lower aromaticity in the hydrochars than in the pyrochars. Whereas the aromatic network of the hydrochars is dominated by polyfurans and N-heterocyclic aromatic units that of the pyrochars is mainly composed of arene structures. The highest total and inorganic N contents were obtained via HTC at 200 degrees C for 30 min, thus this material may be applied if both immediate and slow N release is needed.
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