Wongphudphad Pidchaya, Kemacheevakul Patiya
Department of Environmental Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha-uthit Rd., Bangmod, Tungkru, Bangkok 10140, Thailand E-mail:
Water Sci Technol. 2019 Apr;79(7):1376-1386. doi: 10.2166/wst.2019.133.
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).
鸟粪石结晶是一种从废水中回收磷（P）的有趣方法。然而，所得的鸟粪石晶体较小，这使得它们难以从废水中分离出来。开发了一种用于增大鸟粪石晶体尺寸的连续反应器。进行了批次规模实验以研究增大鸟粪石晶体尺寸的最佳因素。pH实验结果表明，随着pH值（7.6至10）的增加，磷回收效率提高，而鸟粪石晶体尺寸减小。镁磷比实验结果发现，在镁磷比最大时，磷回收效率最高。鸟粪石晶体尺寸没有显著差异。对于温度值的变化，结果表明，当温度值升高时，磷回收效率和晶体尺寸均下降。因此，对于连续反应器，磷回收效率和增大鸟粪石晶体尺寸的优化条件是pH为8.5，镁磷比为1.2:1，温度为30°C（室温）。处理后的猪废水和海水在反应器底部连续进料。30天后，鸟粪石晶体尺寸从125μm增加到0.83mm（增大了七倍）。
Zotero 插件