Phosphate recovery through struvite-family crystals precipitated in the presence of citric acid: mineralogical phase and morphology evaluation

Perwitasari, D.S. and Edahwati, L. and Sutiyono, S. and Muryanto, S. and Jamari, J. and Bayuseno, A.P. (2017) Phosphate recovery through struvite-family crystals precipitated in the presence of citric acid: mineralogical phase and morphology evaluation. Environmental Technology & Innovation, 38 (22). ISSN 2352-1864

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Official URL: https://www.tandfonline.com/doi/abs/10.1080/095933...

Abstract

Precipitation strategy of struvite-family crystals is presented in this paper to recover phosphate and potassium from a synthetic wastewater in the presence of citric acid at elevated temperature. The crystal-forming solutions were prepared from crystals of MgCl2 and NH4H2PO4 with a molar ratio of 1:1:1 for Mg+2, NH+ 4 , and PO−3 4 , and the citric acid (C6H8O7) was prepared (1.00 and 20.00 ppm) from citric acid crystals. The Rietveld analysis of X-ray powder diffraction pattern confirmed a mixed product of struvite, struvite-(K), and newberyite crystallized at 30°C in the absence of citric acid. In the presence of citric acid at 30° and 40°C, an abundance of struvite and struvite-(K) were observed. A minute impurity of sylvite and potassium peroxide was unexpectedly found in certain precipitates. The crystal solids have irregular flake-shaped morphology, as shown by scanning electron microscopy micrograph. All parameters (citric acid, temperature, pH, Mg/P, and N/P) were deliberately arranged to control struvite-family crystals precipitation

Item Type:Article
Uncontrolled Keywords:Precipitation, struvite-family crystals, citric acid, elevated temperature, XRPD Rietveld analysis
Subjects:T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Divisions:Faculty of Engineering > Department of Mechanical Engineering
Faculty of Engineering > Department of Mechanical Engineering
ID Code:71637
Deposited By:Mr. Sugeng Priyanto
Deposited On:15 Apr 2019 17:32
Last Modified:24 Aug 2019 14:05

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