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Model validation of nutrient precipitation using bench-scale reactor

Schneider, P., Pace, K., Kirsten, E. and Natividad, L. (2015) Model validation of nutrient precipitation using bench-scale reactor. In: 9th IWA Symposium on Systems Analysis and Integrated Assessment, 14 - 17 June 2015, Gold Coast, QLD, Australia.

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A model for nutrient recovery by the precipitation of struvite is compared to the operation of a 12-litre bench precipitation reactor, using a defined medium as feedstock. The reactor was operated for durations up to 125 hours and its operation was mimicked by the model simulations. Both the model and the experimental data show the transition from a mass transfer limited system to a feed rate limited system. An apparent rate coefficient is adjusted using experimental data, including crystal mass fraction and orthophosphate concentration in solution. Recovery rates of 75% and 90% were observed at residence times of 2.5 and 4 hours, respectively. This model may be of utility to practitioners wishing to assess process designs and operating policies for their nutrient recovery systems.

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