Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China; CAS Key Laboratory of Renewable Energy, China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, China; University of Chinese Academy of Sciences, Beijing 10049, China.
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China; CAS Key Laboratory of Renewable Energy, China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, China.
Bioresour Technol. 2017 Dec;245(Pt A):463-470. doi: 10.1016/j.biortech.2017.08.195. Epub 2017 Sep 1.
Hydrothermal treatment (HT) has been proved as a significant pretreatment in decreasing emissions of NO pollutants from thermochemical utilization of sewage sludge (SS) derived solid fuel. This study aims to investigate the denitrification of HT and the redistribution of nitrogen (N) in different products so as to speculate the comprehensive pathway of N transformation during hydrothermal process. Results found that only 20% of N remained in hydrochar, whereas the rest of N (nearly 80%) was transformed into other phase. A majority of amino-N in SS was enriched in liquid phase in the form of Org-N at first, then further decomposed to NH-N. The remaining amino-N converted to pyrrole-N, pyridine-N and quaternary-N as temperature progresses. Meanwhile, amine-N derived from protein-N formed heterocyclic-N in oil phase via Diels-Alder reaction. NH, the major nitrogenous gas, was dissolved in liquid as NH-N immediately after producing, but increased with prolonged reaction time.
水热处理（HT）已被证明是一种重要的预处理方法，可减少源自污水污泥（SS）衍生固体燃料的热化学利用过程中 NO 污染物的排放。本研究旨在探究 HT 的脱硝作用以及氮（N）在不同产物中的重新分配，以推测水热过程中 N 转化的综合途径。结果发现，只有 20%的 N 残留在水炭中，而其余近 80%的 N 则转化为其他相。SS 中的大部分氨基-N 最初以有机态（Org-N）的形式富集在液相中，然后进一步分解为 NH-N。剩余的氨基-N 随着温度的升高转化为吡咯-N、吡啶-N 和季铵-N。同时，来自蛋白-N 的胺-N 通过 Diels-Alder 反应在油相中形成杂环-N。NH，主要的含氮气体，在生成后立即以 NH-N 的形式溶解在液相中，但随着反应时间的延长而增加。
