Predicting struvite formation for phosphorus recovery from human urine using an equilibrium model.
Predicting struvite formation for phosphorus recovery from human urine using an equilibrium model.
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DOI：
10.2166/wst.2006.720
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发表时间：
2006-10
期刊：
影响因子：
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通讯作者：
H. Harada;Y. Shimizu;Y. Miyagoshi;S. Matsui;T. Matsuda;T. Nagasaka
中科院分区：
文献类型：
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作者：
H. Harada;Y. Shimizu;Y. Miyagoshi;S. Matsui;T. Matsuda;T. Nagasaka
最近，人们对从粪便中提取尿中磷的兴趣越来越大。在碱性条件下，加入镁盐，尿中的磷可沉淀为鸟粪石（MgNH 4PO 4 × 6 H2O）。然而，鸟粪石的形成，应更好地了解其实际应用。我们预测鸟粪石的形成与一个新的平衡模型的发展。该模型考虑了八种不同类型的沉淀物，包括鸟粪石，离子强度和温度的影响的形成。此外，还进行了尿液中鸟粪石形成的实验，以验证模型的有效性。鸟粪石生成的模型预测与实验结果吻合较好。预测形成鸟粪石的最佳pH为9.4-9.7。根据模型预测，要使Mg浓度为PO 4-P的1.5倍的尿中99%的磷酸盐沉淀，pH值必须大于8.1。
Interest in phosphorus recovery from urine diverted from faeces has been growing recently. Phosphorus in urine can be precipitated out as struvite (MgNH4PO4 x 6H2O) with addition of magnesium salt under alkaline conditions. Struvite formation, however, should be more well understood for its practical application. We predicted the struvite formation with a development of a new equilibrium model. The model considered the formation of eight different kinds of precipitates, including struvite, with effects of ionic strength and temperature. In addition, experiments on struvite formation in urine were conducted for the model validation. The model prediction of struvite formation had good agreement with the experimental results. The optimum pH to form struvite was predicted to be 9.4-9.7. In order to precipitate 99% of phosphate in urine with 1.5 fold Mg concentration to PO4-P, the pH value was necessary to be more than 8.1 based on the model prediction.