Development of phosphorus recovery reactor for enlargement of struvite crystals using seawater as the magnesium source
| Autor: | Pidchaya Wongphudphad, Patiya Kemacheevakul |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Struvite Swine chemistry.chemical_element 02 engineering and technology Wastewater 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Phosphates law.invention Crystal chemistry.chemical_compound Bioreactors law Animals Magnesium Seawater Crystallization 0105 earth and related environmental sciences Water Science and Technology Phosphorus Continuous reactor 021001 nanoscience & nanotechnology chemistry 0210 nano-technology Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Water Science and Technology. 79:1376-1386 |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2019.133 |
| Popis: | Struvite crystallization is an interesting method for the recovery of phosphorus (P) from wastewater. However, the struvite crystals obtained are small, which makes them difficult to separate from wastewater. A continuous reactor for enlarging struvite crystals was developed. Batch-scale experiments were conducted to investigate the optimum factors for the enlargement of struvite crystals. The results of pH experiments showed that P recovery efficiency increased with an increase of pH values (7.6 to 10), while the size of struvite crystals decreased. The results of the Mg:P ratios found that the maximum P recovery efficiency occurred at the maximum ratio of Mg:P. The sizes of struvite crystals were not significantly different. For the variation of temperature values, the results showed that P recovery efficiency and crystal sizes decreased when temperature values increased. Therefore, the optimized conditions for P recovery efficiency and enlargement of struvite crystals for the continuous reactor were pH 8.5 and an Mg:P ratio of 1.2:1 at 30 °C (room temperature). The treated swine wastewater and seawater were continuously fed in at the bottom of the reactor. After 30 days, the size of struvite crystals had increased from 125 μm to 0.83 mm (seven times). |
| Databáze: | OpenAIRE |
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