Kinetics of the reversible reaction of struvite crystallisation
Autor: | Juan M. Garrido, Dafne Crutchik |
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Rok vydání: | 2016 |
Předmět: |
Environmental Engineering
Struvite Health Toxicology and Mutagenesis 0208 environmental biotechnology Batch reactor Inorganic chemistry Kinetics 02 engineering and technology 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Reversible reaction Phosphates Water Purification chemistry.chemical_compound Environmental Chemistry Dissolution 0105 earth and related environmental sciences Supersaturation Precipitation (chemistry) Public Health Environmental and Occupational Health General Medicine General Chemistry Solubility equilibrium Pollution 020801 environmental engineering chemistry Thermodynamics Crystallization Water Pollutants Chemical |
Zdroj: | Chemosphere. 154:567-572 |
ISSN: | 0045-6535 |
Popis: | The crystallisation of struvite could be a sustainable and economical alternative for recovering phosphorus from wastewater streams with high phosphate concentrations. Knowledge regarding the kinetics and thermodynamics that are involved in the crystallisation of struvite is the key to determine the optimal conditions for obtaining an efficient process. This study was conducted in a continuous stirred batch reactor. Different sets of experiments were performed in which struvite was either dissolved (undersaturated) or precipitated (oversaturated). These experiments were conducted at different temperatures (25, 30 and 35 °C) and pH values (8.2, 8.5 and 8.8) to determine the kinetics of struvite precipitation and dissolution. Struvite crystallisation was modelled as a reversible reaction. The kinetic rate parameters of struvite precipitation were 1.03·10(-4), 1.25·10(-4) and 1.54·10(-4) mol m(-2) min(-1) at 25, 30 and 35 °C, respectively. Similar kinetic rate parameters were determined for struvite dissolution. Struvite heterogeneous crystallisation can be represented by a first-order kinetic model that fitted well the experimental data. |
Databáze: | OpenAIRE |
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