期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 247, 期 -, 页码 596-602出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2019.06.046
关键词
Ammonium sulfate; Gas permeable hydrophobic membrane; Nitrogen; Nutrients recycle; Phosphorus; Urine
资金
- Kone Foundation
- Maj and Nessling Foundation
- Ministry of Environment, Finland (RAKI2)-2017-2020
The nitrogen (N) and phosphorus (P) contents in human urine have been recovered using struvite precipitation and N-stripping techniques. Struvite precipitation technique recovers mainly phosphorus whereas N-stripping technique only recovers nitrogen. In this study, we developed an NPharvest technique which recovered both nitrogen and phosphorus separately in the same process, enabling their use independently. The technique used Ca(OH)(2) to increase the pH of urine converting ammonium into NH3 gas and simultaneously precipitating P with Ca. The NH3 gas is passed through a gas permeable hydrophobic membrane (GPHM) and reacts with H2SO4 forming ammonium sulfate. Our result showed that more than 98% (w/w) of N and P can be harvested from urine in 8 h at 30 degrees C. The harvested ammonium sulfate contained 19% (w/w) N, and the sediment contained 1-2% (w/w) P. The extraction of N and P from 1 m(3) of urine could give a profit of 1.5 is an element of .
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