Most previous studies of phosphorus (P) removal focused on investigation of the soluble, and particulate P, but ignoring the difference between organic and inorganic P. In this study, the effects of various flocculants, namely polyacrylamide (PAM) and polyaluminum chloride (PAC), on flocculation efficiency in different P speciations (organic and inorganic P) were investigated. A modified method to differentiate between organic and inorganic P content in secondary effluent samples was developed. The results showed that P speciation based on organic/inorganic P (Pearson's correlation R = 0.915, p < 0.05) was more effective than those based on soluble/particulate P (p > 0.05) in evaluating the P content in secondary effluents. The liquid 31P nuclear magnetic resonance measurements results indicated that PAM was more effective in removing organic P (phosphonates and orthophosphate monoesters) rather than inorganic P. However, PAC was more effective in removing inorganic P (particularly orthophosphate) rather than organic P. Based on the modeled results of a response surface methodology (RSM), doses of PAM and PAC were optimized for secondary effluent containing different amounts of organic and inorganic P from the two typical wastewater treatment plants (WWTPs) in Wuhan city, China.

中文翻译：

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深入了解有机和无机磷形态对二级废水中磷去除效率的影响。

先前大多数除磷（P）的研究都集中在研究可溶性P和颗粒状P，但忽略了有机P和无机P之间的差异。在这项研究中，各种絮凝剂（即聚丙烯酰胺（PAM）和聚氯化铝（PAC）的影响），研究了不同P形态（有机和无机P）的絮凝效率。提出了一种改进的方法来区分二次废水样品中的有机和无机P含量。结果表明，基于有机/无机P的P形态（Pearson相关系数R = 0.915，p <0.05）比基于可溶/颗粒P的P形态（p> 0.05）在评估二级废水中的P含量上更为有效。