文献类型：期刊文献

英文题名：Hydrothermal carbonization of sewage sludge: Effect of aqueous phase recycling

作者：Xu, Zhi-Xiang[1] Song, Hao[1] Li, Pei-Jun[1] He, Zhi-Xia[2] Wang, Qian[1] Wang, Kui[3] Duan, Pei-Gao[4]

第一作者：Xu, Zhi-Xiang

通信作者：Xu, ZX[1]

机构：[1]Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Jiangsu, Peoples R China;[2]Jiangsu Univ, Inst Energy Res, Zhenjiang 212013, Jiangsu, Peoples R China;[3]Chinese Acad Forestry, Inst Chem Ind Forestry Prod, Nanjing 210042, Peoples R China;[4]Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Shaanxi Key Lab Energy Chem Proc Intensificat, 28 West Xianning Rd, Xian 710049, Shaanxi, Peoples R China

年份：2020

卷号：387

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20194807739617);Scopus(收录号：2-s2.0-85075356947);WOS:【SCI-EXPANDED(收录号:WOS:000527331600012)】；

基金：We gratefully acknowledge the financial support of the National Natural Science Foundation of China (51876080), the Scientific and Technological Innovation Team of the University of Henan Province (18IRTSTHN010), the Outstanding Youth Foundation for Scientific and Technological Innovation in Henan Province (184100510013), the Foundation of Jiangsu University of Advanced Scholars (15JDG159), and the Key Research and Development Program of Zhenjiang City (SH2018018).

语种：英文

外文关键词：Sewage sludge; Hydrothermal carbonization; Aqueous phase; Recycling; Hydrochar

摘要：In this study, the aqueous phase produced from the hydrothermal carbonization (HTC) of sewage sludge (SS) with pure water was reused for the HTC of fresh SS, aiming to maximize energy recovery from the aqueous phase. The aqueous phase was recycled four times. The effects of aqueous phase recycling on the properties of the aqueous phase and hydrochar produced at temperatures of 200, 230, and 260 degrees C were studied. The hydrochar yield always decreased with increasing temperature regardless of whether the aqueous phase was recycled. The C and N contents and higher heating values of the hydrochars produced with aqueous phase recycling were all higher than that of the hydrochar produced with pure water and slightly increased as the number of recycling times increased. The O/C and H/C atomic ratios of the hydrochars revealed that dehydration was the main reaction pathway during HTC of SS. The pH value of the aqueous phase increased as the number of recycling times increased, indicating that the concentration of NH4+-N in the aqueous phase increased. The process of aqueous phase recycling affected the carbonization of the hydrochar. These results suggest that aqueous phase recycling was favorable for energy recovery from the aqueous phase produced from the HTC of SS and for improving the combustion properties of the hydrochar. Thus, we believe that aqueous phase recycling was a promising strategy for energy recovery, aqueous phase disposal, and the production of high-quality hydrochar with respect to the HTC of SS.