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Optimization of struvite precipitation in synthetic biologically treated swine wastewater - Determination of the optimal process parameters

Capdevielle, Aurélie and Sýkorová, Eva and Biscans, Béatrice and Béline, Fabrice and Daumer, Marie-Line Optimization of struvite precipitation in synthetic biologically treated swine wastewater - Determination of the optimal process parameters. (2013) Journal of Hazardous Materials, vol. 244-245. pp. 357-369. ISSN 0304-3894

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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2012.11.054

Abstract

A sustainable way to recover phosphorus (P) in swine wastewater involves a preliminary step of P dissolution followed by the separation of particulate organic matter. The next two steps are firstly the precipitation of struvite crystals done by adding a crystallization reagent (magnesia) and secondly the filtration of the crystals. A design of experiments with five process parameters was set up to optimize the size of the struvite crystals in a synthetic swine wastewater. More than 90% of P was recovered as large crystals of struvite in optimal conditions which were: low Mg:Ca ratio (2.25:1), the leading parameter, high N:P ratio (3:1), moderate stirring rate (between 45 and 90 rpm) and low temperature (below 20°C). These results were obtained despite the presence of a large amount of calcium and using a cheap reactant (MgO). The composition of the precipitates was identified by Raman analysis and solid dissolution. Results showed that amorphous calcium phosphate (ACP) co-precipitated with struvite and that carbonates were incorporated with solid fractions.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S0304389412011569#
HAL Id:hal-00875743
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut national de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture - IRSTEA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Institute of Chemical Technology Prague - ICT (CZECH REPUBLIC)
Other partners > Université Européenne de Bretagne - UEB (FRANCE)
Laboratory name:
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Deposited By: Vincent GERBAUD
Deposited On:22 Oct 2013 13:59

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