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研究论文

Effect of hydraulic retention time and stirring speed on phosphorus recovery from urine in a stirred reactor

摘要：鸟粪石沉淀法可以在搅拌反应器中回收尿液中的磷，而水力停留时间和搅拌速率对鸟粪石晶体的形成有重要影响.因此，本文在搅拌反应器中通过分批实验研究了水力停留时间（0.5、1.0和2.0 h）和搅拌速率（80、160和320 r·min^-1）对尿液中磷的回收率和鸟粪石晶体粒径的影响.结果表明，水力停留时间从0.5 h 增至2 h时，磷回收率从88.9%增至95.4%，而鸟粪石晶体平均粒径从124.4 μm下降为71.2 μm.随搅拌速率从80 r·min^-1增至320 r·min^-1，磷回收率从88.7%增至93.4%，而鸟粪石晶体平均粒径从37.0 μm增至78.9 μm. 较短的水力停留时间和较高的搅拌速率更有利于大粒径的鸟粪石晶体形成，但对磷回收率影响有限.搅拌速率为160 r·min^-1时，鸟粪石回收率最高为78.7%，可以得到纯度很高的鸟粪石晶体，而较高和较低的搅拌速率都不利于提高鸟粪石回收率.

Abstract：Struvite crystallization is a fast and reliable method for phosphorus recovery from urine. Hydraulic retention time and stirring speed are two important parameters affecting the struvite formation and phosphorus recovery. Batch experiments were carried out to investigate the effect of hydraulic retention time and stirring speed on phosphorus recovery and average crystal size. With hydraulic retention time increasing from 0.5 h to 2.0 h, the phosphorus recovery percentage increased from 88.9% to 95.4%, while the average crystal size reduced from 124.4 μm to 71.2 μm. With the stirring speed increasing from 80 r·min^-1 to 320 r·min^-1, the phosphorus recovery percentage increased from 88.7% to 93.4%, and the average crystal size increased from 37.0 μm to 78.9 μm. Shorter hydraulic retention time and higher stirring speed contributed to larger average crystal size, but had no obvious influence on phosphorus recovery. The highest struvite recovery percentage of 78.7% was obtained under the stirring speed of 160 r·min^-1.