期刊
CHEMICAL ENGINEERING JOURNAL
卷 298, 期 -, 页码 146-153出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.03.148
关键词
Human urine; Phosphorus recovery; Magnesium sources; Stirring speed; Struvite crystal size
资金
- European Union's Seventh Programme for research, technological development and demonstration [308535]
- Portuguese Foundation for Science and Technology (FCT) [UID/BIO/04469/2013]
- COMPETE [POCI-01-0145-FEDER-006684]
- [RECl/BBB-EBI/0179/2012 (FCOMP-01-0124-FEDER-027462)]
Phosphorus recycling and recovery has received special attention due to its non-replaceable and non renewability. Phosphorus recovery from human urine in the form of struvite crystals is a potential alternative source. In this work, the efficiency of struvite precipitation from source separated human urine and struvite crystals size were analyzed using three different Mg2+ sources (MgCl2, Mg(OH)(2) and MgO), individually evaluated using a statistical design of experiments to assess the combined effect of Mg2+:P molar ratio (1:1, 1.5:1 and 2:1) and stirring speed (30, 45 and 60 rpm). Formation of struvite crystals was confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS). Using the optimal conditions determined, MgO as Mg2+ source at 2:1 molar ratio and a stirring speed of 30 rpm, 99% of P was recovered as struvite crystals with a size of 50-100 mu m. (C) 2016 Elsevier B.V. All rights reserved.
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