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A new torrefaction system employing spontaneous self-heating of livestock manure under elevated pressure
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Title: | A new torrefaction system employing spontaneous self-heating of livestock manure under elevated pressure |
Authors: | Itoh, Takanori Browse this author →ORCID | Iwabuchi, Kazunori Browse this author →KAKEN DB | Maemoku, Naohiro Browse this author | Sasaki, Izumi Browse this author | Taniguro, Katsumori Browse this author |
Keywords: | Biochar | Torrefaction | Elevated pressure | Manure management | Oxidation | Self-heating |
Issue Date: | 15-Feb-2019 |
Publisher: | Elsevier |
Journal Title: | Waste management |
Volume: | 85 |
Start Page: | 66 |
End Page: | 72 |
Publisher DOI: | 10.1016/j.wasman.2018.12.018 |
PMID: | 30803615 |
Abstract: | This report describes a new oxidative torrefaction method employing spontaneous self-heating of feed-stock as a means of overcoming practical difficulties in converting livestock manure to biochar. We examined the initiating temperature required to induce self-heating of wet dairy cattle manure under 1.0 MPa pressure and conducted elemental and calorific analyses of the solid products prepared at 200, 250, and 300C°. Self-heating was initiated with oxidation below 100C°, and the lower limit of the initiation temperature was between 85 and 90C°. Comparing processes performed at 0.1 and 1.0 MPa, the higher pressure promoted self-heating by both preventing heat loss due to moisture evaporation occurring at approximately 100C° and supplying oxygen to the high-moisture feedstock. In addition, as drying occurred at 160-170C° during the process, the system did not require pre- or post-drying. Although the heating values of the solid products decreased due to high ash content, the elemental composition of the products was altered to that of peat-like (200C°) and lignite-like (250 and 300C°) materials. Cessation of self-heating of the manure is recommended at approximately 250C° to avoid severe decomposition at higher temperatures. Overall, these results demonstrated the utility of the proposed method for converting wet manure into dried biochar through self-heating as well as potential applications in manure management systems. © 2019 The Authors. Published by Elsevier Ltd. |
Rights: | https://creativecommons.org/licenses/by/4.0/ |
Type: | article |
URI: | http://hdl.handle.net/2115/75832 |
Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 伊藤 貴則
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