Environ Technol. 2014 May-Jun;35(9-12):1250-62. doi: 10.1080/09593330.2013.865790.
An experimental design was set up to understand the influence of five process parameters on the kinetics of struvite precipitation in synthetic swine wastewaters. The responses studied were the kinetics of phosphorus (P) removal, the struvite precipitation rate and the dissolution rate of amorphous calcium phosphates (ACP). The kinetic study showed that the P-removal was complete in less than 1 h and was influenced positively by the added MgO. The precipitation of struvite with MgO was confirmed to follow a first-order kinetic. This study showed that ACP co-precipitated with struvite during the first 30 min. Afterwards, ACP dissolved to maintain the phosphates balance limiting the struvite growth. An initial Mg:Ca > 1.5 induced a complete dissolution of ACP in 1 h. Another experiment was conducted and it validated the results of the statistical model. This experiment also determined that 7-10 h was the best time to recover large crystals. After 10 h, the crystals were broken by stirring.
设计了一个实验来研究五个工艺参数对合成猪废水中鸟粪石沉淀动力学的影响。研究的反应包括磷（P）去除动力学、鸟粪石沉淀速率和无定形磷酸钙（ACP）的溶解速率。动力学研究表明，不到 1 小时内 P 去除就完成了，并且添加的 MgO 对其有积极影响。MgO 沉淀鸟粪石被证实遵循一级动力学。这项研究表明，在最初的 30 分钟内，ACP 与鸟粪石共沉淀。之后，ACP 溶解以保持磷平衡，限制鸟粪石生长。初始 Mg:Ca > 1.5 可在 1 小时内完全溶解 ACP。进行了另一个实验，验证了统计模型的结果。该实验还确定了 7-10 小时是回收大晶体的最佳时间。10 小时后，通过搅拌破坏晶体。
