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Title: Biochar and hydrochar derived from freshwater sludge: characterization and possible applications
Authors: Zhang, Yunhui
Qin, Junde
Yi, Yaolin
Keywords: Engineering::Environmental engineering
Issue Date: 2021
Source: Zhang, Y., Qin, J. & Yi, Y. (2021). Biochar and hydrochar derived from freshwater sludge: characterization and possible applications. Science of the Total Environment, 763, 144550-.
Journal: Science of the Total Environment
Abstract: Freshwater sludge (FS) is generated in large quantities during the production of drinking water every day. It is largely underutilized, and has long been filter pressed to sludge cake and then disposed of in landfills. The search for more economical and sustainable disposal or reuse options is urgently needed. Biochar and hydrochar are increasingly popular wastes derived materials with huge potential for soil improvement, environmental remediation, and mitigation of climate change, but there is a lack of research on the production of FS derived biochar and hydrochar. In this study, biochar was produced by pyrolysis at 300, 500 or 700 °C for 1 h, and hydrochar was produced by hydrothermal carbonization (HTC) at 140, 160, 180 or 200 °C for 4 h. Proximate analyses show that the biochar has a higher carbon stability and is possibly suitable for carbon sequestration, while the hydrochar contains more labile carbon structures. The ultimate analysis indicates that the surface hydrophobicity is in the order of: biochar > hydrochar > FS. The phytotoxicity tests indicate their positive effects on germination of wheat seeds. This study provides a new treatment to reuse numerous FS and put forward the possible applications of its carbonaceous products, which is expected to facilitate a circular economy and realize the zero-waste target.
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2020.144550
Schools: School of Civil and Environmental Engineering 
Rights: © 2020 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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