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Production of slow-released nitrogen fertilizer from urine

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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
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:
Type: article (author version)
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)

Submitter: 伊藤 竜生

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