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

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.
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https://hal.archives-ouvertes.fr/hal-00875743
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Submitted on : Tuesday, October 22, 2013 - 4:00:08 PM
Last modification on : Monday, May 18, 2020 - 2:37:19 PM
Long-term archiving on: : Thursday, January 23, 2014 - 4:27:32 AM

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Aurélie Capdevielle, Eva Sýkorová, Béatrice Biscans, Fabrice Béline, Marie-Line Daumer. Optimization of struvite precipitation in synthetic biologically treated swine wastewater - Determination of the optimal process parameters. Journal of Hazardous Materials, Elsevier, 2013, vol. 244-245, pp. 357-369. ⟨10.1016/j.jhazmat.2012.11.054⟩. ⟨hal-00875743⟩

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