1. Kinetics of struvite precipitation in synthetic biologically treated swine wastewaters
- Author
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Marie-Line Daumer, Fabrice Béline, Eva Sýkorová, Aurélie Capdevielle, Irstea Publications, Migration, Gestion environnementale et traitement biologique des déchets (UR GERE), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), ICT PRAGUE DEPARTMENT OF WATER TECHNOLOGY AND ENVIRONNEMENTAL ENGINEERING PRAGUE CZE, Partenaires IRSTEA, and Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
- Subjects
[SDE] Environmental Sciences ,Swine ,Inorganic chemistry ,Kinetics ,Magnesium Compounds ,chemistry.chemical_element ,AMORPHOUS CALCIUM PHOSPHATE ,02 engineering and technology ,Wastewater ,010501 environmental sciences ,Calcium ,01 natural sciences ,Phosphates ,STRUVITE ,chemistry.chemical_compound ,Bioreactors ,Waste Management ,KINETIC ,Animals ,Chemical Precipitation ,Environmental Chemistry ,Amorphous calcium phosphate ,Waste Management and Disposal ,Dissolution ,0105 earth and related environmental sciences ,Water Science and Technology ,Models, Statistical ,Precipitation (chemistry) ,Phosphorus ,General Medicine ,Limiting ,Hydrogen-Ion Concentration ,021001 nanoscience & nanotechnology ,6. Clean water ,chemistry ,Struvite ,[SDE]Environmental Sciences ,Magnesium Oxide ,0210 nano-technology - Abstract
International audience; An experimental design was set up to understand the influence of five process parameters on the kinetics of struvite precipitation in synthetic swine wastewaters. The responses studied were the kinetics of phosphorus (P) removal, the struvite precipitation rate and the dissolution rate of amorphous calcium phosphates (ACP). The kinetic study showed that the Premoval was complete in less than 1 h and was influenced positively by the added MgO. The precipitation of struvite with MgO was confirmed to follow a first-order kinetic. This study showed that ACP co-precipitated with struvite during the first 30 min. Afterwards, ACP dissolved to maintain the phosphates balance limiting the struvite growth. An initial Mg:Ca > 1.5 induced a complete dissolution of ACP in 1 h. Another experiment was conducted and it validated the results of the statistical model. This experiment also determined that 7–10 h was the best time to recover large crystals. After 10 h, the crystals were broken by stirring.
- Published
- 2014