科研之友
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摘要
Nitrogen (N) in sewage sludge (SS) should be reduced if it is to be used to produce clean solid fuels. However, the N transformation during hydrothermal carbonization (HTC) of SS is not yet fully understood. Since the composition of SS is complex, it is wise to study a model compound, which should have typical functional groups of organic compo-nents. Hence, in this study, six model components (protein, lipid, cellulose, hemicellulose, humic acid, and lignin) representing the main organic components in SS were mixed with SS and treated at 150-270 center dot C for 1 h. The influence of the organic component and reaction temperature on hydrochar yield, hydrochar characterization, and N distribu-tion in the products was investigated. Except for proteins and lipids, all the other components were found to contribute to the N content and aromatization of the hydrochar. Humus shows the best comprehensive performance in terms of both reducing the N content and increasing the aromaticity. The strongest effects of hemicellulose and cellulose on N retention in hydrochar are found to occur at 210 center dot C and 240 center dot C, respectively. The N retention caused by lignin is correlated with the Mannich reaction at 240 center dot C, while humus significantly promotes N transformation at 240 center dot C. For carbohydrates, lignin, and humus, the temperatures required for increasing the N content and aromaticity maintain a high degree of consistency. Although protein pulls down the energy recovery (ER) and yield of the hydrochar, obser-vations indicate that it favors the carbonization process. This finding can be used for estimating the N content and qual-ity of hydrochar and provides references for future research targeting the upgrading of hydrochar.
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单位1; 西安交通大学
