Thermochemistry of sulfur during pyrolysis and hydrothermal carbonization of sewage sludges
文献类型：期刊论文
| 作者 | Huang, Rixiang; Tang, Yuanzhi; Luo, Lei |
| 刊名 | WASTE MANAGEMENT
 |
| 出版日期 | 2021-02-15 |
| 卷号 | 121页码:276-285 |
| 关键词 | Sewage sludge Sulfur Heavy metal Pyrolysis Hydrothermal carbonization Chromate adsorption |
| ISSN号 | 0956-053X |
| 英文摘要 | Sulfur (S) is an abundant and redox-active element in urban wastewater systems and plays a critical role in both the wastewater and sludge treatment processes. This study comparatively characterized the transformation of S and several closely associated metals (Cu, Zn, and Fe) during pyrolysis (250 to 750 degrees C) and hydrothermal carbonization (HTC, 150 to 275 degrees C) treatments of sewage sludge. S, Fe, Zn, and Cu K-edge X-ray absorption spectroscopy was applied to quantitatively evaluate the fate of S and contribution of different S species in regulating metal speciation. During pyrolysis, aliphatic-S and sulfonate were preferentially degraded at low temperature (below 350 degrees C) and sulfate was thermochemically reduced at temperature above 450 degrees C, while metal sulfides (up to 27%) and thiophenes (up to 70%) were increasingly formed. Similar to the pyrolysis process, metal sulfides (up to 40% at temperature above 200 degrees C) and thiophenes were formed during HTC. The degradation of thiols and organic sulfide, as well as sulfate reduction, released sulfide and strongly affected metal speciation. For example, almost all Cu and half of Zn were transformed into Cu -Feor Zn-Fe-sulfides during HTC, whereas they were partially desulfidized during pyrolysis. High abundance of reduced S species (S-1 and S-2) in hydrochars may contribute to their strong reductive adsorption of Cr(VI). Results from this work reveal the thermochemical reactions driving the transformations of S and its associated metals during pyrolysis and HTC. The results provide fundamental knowledge for selecting thermochemical sludge treatment techniques for value-added applications of the products. (C) 2020 Elsevier Ltd. All rights reserved. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45862]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China 2.Georgia Inst Technol, Sch Earth & Atmospher Sci, 311 Ferst Dr, Atlanta, GA 30324 USA 3.SUNY Albany, Dept Environm & Sustainable Engn, 1400 Washington Ave, Albany, NY 12222 USA 4.Guangzhou Univ, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Rixiang,Tang, Yuanzhi,Luo, Lei. Thermochemistry of sulfur during pyrolysis and hydrothermal carbonization of sewage sludges[J]. WASTE MANAGEMENT,2021,121:276-285. |
| APA | Huang, Rixiang,Tang, Yuanzhi,&Luo, Lei.(2021).Thermochemistry of sulfur during pyrolysis and hydrothermal carbonization of sewage sludges.WASTE MANAGEMENT,121,276-285. |
| MLA | Huang, Rixiang,et al."Thermochemistry of sulfur during pyrolysis and hydrothermal carbonization of sewage sludges".WASTE MANAGEMENT 121(2021):276-285. |
入库方式： OAI收割
来源：生态环境研究中心
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