Abstract
Human excreta, especially urine, are rich in nitrogen and phosphorous that can be utilized for agricultural purposes. The recovery of nitrogen from urine has potential to reduce energy consumption for producing nitrogen fertilizer, and the recovery of phosphorus from excreta will reduce the pressure on phosphorus reserves. The direct formation of slow-released fertilizer—methylene urea—from urine was being proposed in this study. The experiments were tried to prove the formation of methylene urea from human urine, and the NMR, IR analyses, and element analysis showed the product is methylene urea. It is experimentally showed that phosphorous in urine can be recovered on the shell surface by immersing shell particles in urine. Scallop (Mizuhopecten yessoensis) shell was used in the experiments. SEM/EDS, powder XRD analysis, and composition measurements showed that the precipitate from the experiment with the Ca/P ratio = 1 was DCPD, and amorphous of hydroxyapatite was developed in the experiment with the initial Ca/P = 10. Elemental analysis of the cross section of shell particle by SEM/EDS showed that the reaction started from particle surface and then propagated to inside the particles.
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Ito, R., Funamizu, N. (2019). Recovery of Nitrogen and Phosphorus from Urine. In: Funamizu, N. (eds) Resource-Oriented Agro-sanitation Systems. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56835-3_11
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DOI: https://doi.org/10.1007/978-4-431-56835-3_11
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