Investigation on the Evolution of N-Containing Organic Compounds during Pyrolysis of Sewage Sludge
Investigation on the Evolution of N-Containing Organic Compounds during Pyrolysis of Sewage Sludge
复制标题
DOI：
10.1021/es5022137
复制
发表时间：
2014-09-16
影响因子：
11.4
通讯作者：
Yu, Han-Qing
中科院分区：
文献类型：
--
作者：
Tian, Ke;Liu, Wu-Jun;Yu, Han-Qing
热解是一种新兴的处理大量城市污泥的技术。然而，污泥中有机物的热化学分解机理尚不清楚。我们采用了一种新的在线TG-FTIR-MS技术来研究污泥的热解过程。污泥样品在150-800摄氏度的温度下以10、50和200K min(-1)的升温速度热解。我们首次发现，在相同的条件下，热解升温速率可以显著改变生成的液体有机化合物的种类，但不能改变产生的气体的种类。产生的气体和液体化合物的含量受加热速度和热解温度的影响，其中大部分产生在293-383摄氏度。污泥中的吡咯氮、蛋白质氮、胺氮、吡啶氮等N-化合物分解生成杂环-N、胺-N和腈-N化合物。杂环-N化合物是主要的含氮产物，这可能是由于吡啶-N和吡咯-N的热化学分解所致，而在热解过程中生成的胺-N化合物较少。在此基础上，提出了污泥中含氮化合物的分解机理
Pyrolysis is an emerging technology for the disposal of huge amounts of sewage sludge. However, the thermochemical decomposition mechanism of organic compounds in sludge is still unclear. We adopt a novel online TG-FTIR-MS technology to investigate the pyrolysis of sludge. The sludge samples were pyrolyzed from 150 to 800 degrees C with heating rates of 10, 50, and 200 K min(-1). We found for the first time that the heating rate of pyrolysis can significantly change the species of liquid organic compounds produced, but cannot change the gaseous species produced under the same conditions. The contents of produced gas and liquid compounds, most of which were produced at 293-383 degrees C, are influenced by both the heating rate and temperature of pyrolysis. The results also showed that heterocyclic-N, amine-N, and nitrile-N compounds are obtained from the decomposition of N-compounds in sludge, such as pyrrolic-N, protein-N, amine-N, and pyridinic-N. Heterocyclic-N compounds are the dominant N-containing products, which can be due to the thermochemical decomposition of pyridine-N and pyrrole-N, whereas fewer amine-N compounds are produced during the pyrolysis. A mechanism for the decomposition of N-containing compounds in sludge is proposed based on the obtained data