Impact of hydrodynamics on the precipitation efficiency--application to HARDTAC reactor
| Autor: | K. Essemiani, E. Barbier, A. Genin, S. Logette, Cyrille Lemoine |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Environmental Engineering
Gypsum Population Nucleation Computational fluid dynamics engineering.material Calcium Sulfate Waste Disposal Fluid law.invention law Crystal size distribution Chemical Precipitation Computer Simulation Crystallization Particle Size education Water Science and Technology education.field_of_study business.industry Environmental engineering Mechanics Kinetics Wastewater Models Chemical engineering Environmental science business Mass fraction |
| Zdroj: | Water science and technology : a journal of the International Association on Water Pollution Research. 56(11) |
| ISSN: | 0273-1223 |
| Popis: | Precipitation of gypsum is studied in a HARDTAC (High-Aspect Ratio, Draft-Tube, Agitated Crystallizer) reactor, which is considered as the core crystallization unit of lots of wastewater treatment systems. Coupling Computational Fluid Dynamics (CFD) and population balance modelling to simulate precipitation can be a useful tool to come to a decision about upstream and downstream units. In the present study, we aim to validate such approach by investigating gypsum precipitation in a HARDTAC pilot unit and comparing experiments results with simulation. Measured nucleation and growth kinetics are used to feed the model. A comparison between experiments and simulations is presented in the case of gypsum precipitation with a given set of operating conditions. Good agreement is obtained for species concentrations, gypsum mass fraction and volumetric mean diameter but some discrepancies still remain between measured and simulated crystal size distribution. |
| Databáze: | OpenAIRE |
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