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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >
Production of slow-released nitrogen fertilizer from urine
| Title: | Production of slow-released nitrogen fertilizer from urine |
| Authors: | Ito, Ryusei Browse this author | | Takahashi, Eri Browse this author | | Funamizu, Naoyuki Browse this author →KAKEN DB |
| Keywords: | methylene urea | | nitrogen recovery | | human urine | | pH | | salt concentration |
| Issue Date: | 1-Oct-2013 |
| Publisher: | Taylor & francis |
| Journal Title: | Environmental technology |
| Volume: | 34 |
| Issue: | 20 |
| Start Page: | 2809 |
| End Page: | 2815 |
| Publisher DOI: | 10.1080/09593330.2013.790069 |
| PMID: | 24527645 |
| Abstract: | Human excreta, especially urine is rich in nitrogen that can be utilized for agricultural purposes, while the slow-release fertilizer allows effective utilization of nutrients in agricultural production. The direct formation of slow-release fertilizer - methylene urea - from urine was being proposed in this study. The experiments were tried to prove formation of methylene urea from human urine, and to investigate the effect of pH and salt concentration on the reaction rate. The synthetic urine and real urine were used for the urea source of the reaction. As a result, the precipitates were prepared from synthetic urine, while the small molecule fractions generated then they grew into precipitate. The nuclear magnetic resonance, infrared spectroscopy, element analyses showed the precipitates in synthetic urine were the same compound found in the urea solution, which was methylene urea. The reaction rate was high at low pH value. The reaction rate in the buffer solution was lower than the synthetic urine at the same pH, because some salts may work as a catalyst. The urea concentration reduction rate in real urine showed the same trend with synthetic urine at the same pH, while the precipitation was quite similar to methylene urea. |
| Rights: | This is an Accepted Manuscript of an article published by Taylor & Francis in Environmental Technology on 2014, available online: http://www.tandfonline.com/10.1080/09593330.2013.790069 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/57595 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 伊藤 竜生
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