文献类型：期刊文献

英文题名：Transformation characteristics of nitrogen, sulfur and chlorine during microwave-assisted hydrothermal treatment of excavated waste

作者：Tang, Longfei[1,2,3];Hu, Zichao[1,2];Gao, Peipei[1,2];Chen, Chenge[2];Chen, Qian[2];Jiang, Chunxi[2];Li, Wanyu[2];Ding, Lu[1,2,3];Chen, Xueli[1,2];Wang, Fuchen[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2023

卷号：384

外文期刊名：JOURNAL OF CLEANER PRODUCTION

收录：;EI(收录号：20225213290122);WOS:【SCI-EXPANDED(收录号:WOS:000908839900001)】；

基金：Acknowledgments This work was supported by the National Natural Science Foundationof China (22108081) , the Social Development Science and Technology Tackling Project of 2020 ?Scientific and Innovative Action Plan of Shanghai? (20dz1203300) , and the Shanghai ?Super Postdoctoral Fellow? incentive program (2020118) .

语种：英文

外文关键词：Microwave-assisted hydrothermal purification; Excavated wastes; Potentially harmful elements removal; Speciation changes; Hydrochar

摘要：The removal effect of nitrogen, sulfur and chlorine from the excavated waste utilizing the microwave-assisted hydrothermal method was investigated in this work. Speciation changes of nitrogen, sulfur and chlorine in hydrochars with different treatment times were determined by X-ray photoelectron spectroscopy analysis. Re-sults showed that 90% chlorine, 65% nitrogen and 63% sulfur were removed from the excavated waste after treatment at 230 degrees C for 100 min, while 82% energy and 85% carbon element were recovered at the same time. The conversion of organic nitrogen, sulfur and chlorine into the corresponding water-soluble inorganic forms was enhanced by the combined microwave irradiation and hydrothermal reaction, which promoted the migration of Cl, S, N into the liquid phase. However, some original and generated species of nitrogen, sulfur and chlorine remained in the hydrochars due to the polymerization of organic forms and the adsorption of inorganic forms. These findings suggested that the efficient purification of nitrogen, sulfur and chlorine in excavated waste could be obtained using the microwave-assisted hydrothermal treatment without additives, which provided a reference for the recycling and cleaning utilization of excavated waste.