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Composition characterization and transformation mechanism of dissolved organic phosphorus in wastewater treatment using 31P NMR spectroscopy

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Abstract

The migration and transformation of phosphorus components in wastewater treatment plants (WWTPs) play a crucial role in the convergence and circulation of phosphorus. However, the composition and variation of dissolved organic phosphorus (DOP) in WWTPs were unclear because of its complex nature, hindering its efficient detection. In this study, the DOP species and their transformation during the treatment process in WWTP were comprehensively analyzed. First, two enrichment methods were assessed for their effectiveness at facilitating wastewater analysis: lyophilization and aluminum salt precipitation. Aluminum salt precipitation was found to be better because its application allowed 31P nuclear magnetic resonance (31P NMR) spectroscopy to identify more species in the secondary effluent: orthophosphate (Ortho-P) (81.1%–89.3% of the dissolved total phosphorus), pyrophosphates (Pyro-P) (0%–2.3%), orthophosphate monoesters (Mono-P) (7.0%–10.77%), orthophosphate diesters (Di-P) (1.0%–2.96%), and phosphonate (Phos-P) (1.7%–5.16%). Furthermore, the variation and transformation mechanism of phosphorus, particularly those of DOP, during the entire sewage-treatment process were elucidated. Among the treatment steps, biological treatment combined tertiary treatment achieved better DOP removal efficiencies. Therein, biological treatment mainly removed Mono-P and Di-P with removal efficiencies of 33.3% and 41.7% compared with the effluent of the grit chamber. Di-P has higher bioavailability and is more easily converted and utilized by microorganisms than Mono-P. However, Phos-P, with low bioavailability, was hardly utilized by microorganisms, which showed only 18.4% removal efficiency in biological treatment. In tertiary treatment, coagulation process exhibited higher removal ability of Ortho-P (69.1%) and partial removal efficiencies of DOP, resulting in an increase in the DOP proportion in TP. In addition, Phos-P could not be effectively removed through the biological treatment and was only partially reduced via the adsorption process by large particles, zoogloea or multinuclear hydroxyl complexes. The results of this study can provide a theoretical basis for efficient phosphorus removal in WWTPs.

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Acknowledgements

This work was carried out with the support of the Major Science and Technology Program for Water Pollution Control and Treatment (No. 2017ZX07106); the China Postdoctoral Science Foundation (No. 2022M713469); the China Construction Technology Consulting Co., Ltd. Youth Fund (No. Z2022Q15); the North China Municipal Engineering Design & Research Institute Co. Ltd. (HJ-2021-53-HJY).

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Authors and Affiliations

  1. National Engineering Research Center For Urban Water & Wastewater, North China Municipal Engineering Design & Research Institute Co., Ltd., Tian**, 300381, China

    Yuting Zhang, Wei Shang, **ngcan Zheng, Yongli Sun, Pengfeng Li, Miao Gu, Wen-an Zhang & Huanmei Ma

  2. School of Environment Science & Engineering, Tian** University, Tian**, 300350, China

    Yuting Zhang & SoonThiam Khu

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  1. Yuting Zhang
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  2. Wei Shang
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  3. SoonThiam Khu
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  4. **ngcan Zheng
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  5. Yongli Sun
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  6. Pengfeng Li
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  7. Miao Gu
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  8. Wen-an Zhang
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  9. Huanmei Ma
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Correspondence to Wei Shang.

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Conflict of Interests The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Highlights

• The appropriate enrichment method for waste-water was assessed.

• Mono-P and Di-P were efficiently removed in biological treatment.

• Mechanism of P-components migration and transformation were established in WWTP.

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Zhang, Y., Shang, W., Khu, S. et al. Composition characterization and transformation mechanism of dissolved organic phosphorus in wastewater treatment using 31P NMR spectroscopy. Front. Environ. Sci. Eng. 18, 34 (2024). https://doi.org/10.1007/s11783-024-1794-5

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  • DOI: https://doi.org/10.1007/s11783-024-1794-5

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