Impact of calcium on struvite crystal size, shape and purity

Le Corre, Kristell S., Valsami-Jones, Eugenia, Hobbs, Phil and Parsons, Simon A. (2005) Impact of calcium on struvite crystal size, shape and purity. Journal of Crystal Growth, 283 3-4: 514-522. doi:10.1016/j.jcrysgro.2005.06.012

Author Le Corre, Kristell S.
Valsami-Jones, Eugenia
Hobbs, Phil
Parsons, Simon A.
Title Impact of calcium on struvite crystal size, shape and purity
Journal name Journal of Crystal Growth   Check publisher's open access policy
ISSN 0022-0248
Publication date 2005-10-01
Sub-type Article (original research)
DOI 10.1016/j.jcrysgro.2005.06.012
Volume 283
Issue 3-4
Start page 514
End page 522
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Struvite precipitation occurs spontaneously in wastewater treatment plants under conditions that are influenced by many factors including concentration of Mg2+, NH4+, and PO43− ions, pH, temperature, and mixing energy. These parameters are often difficult to control and as a result struvite generates problems of scale deposits in areas such as pipes and recirculation pumps. At the same time, struvite is considered as a potentially marketable product as an alternative fertiliser. For those two reasons, it has become important to study the principles of struvite precipitation, and to assess the parameters controlling struvite crystallisation. In the present work, the influence of Ca2+ ions on the precipitation of struvite was investigated in aqueous solutions containing Mg2+, NH4+, and PO43− ions in a molar ratio 1:2:2 at room temperature and constant pH. Different laboratory experiments have been used to assess the effects of Ca2+ ions on size, shape, and purity of the crystals formed. Tools used include particle size analysis, X-ray diffraction (XRD), and scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDS). The experimental results showed that the presence of calcium in the media can affect significantly struvite crystal growth and the characteristics of the crystal produced.
Keyword A1. Crystal sizeand morphology
A1. Precipitation
B1. Ca
B1. Struvite
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
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Created: Wed, 19 Oct 2011, 15:58:08 EST by Dr Kristell Le Corre on behalf of Advanced Water Management Centre