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

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

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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(31PNMR)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.

Municipal wastewaterDissolved organic phosphorusCompositionTransformation31P nuclear magnetic resonance

Yuting Zhang、Wei Shang、Soon Thiam Khu、Xingcan Zheng、Yongli Sun、Pengfeng Li、Miao Gu、Wen-An Zhang、Huanmei Ma

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

School of Environment Science & Engineering,Tianjin University,Tianjin 300350,China

水体污染控制与治理科技重大专项中国博士后科学基金China Construction Technology Consulting Co.,Ltd.Youth FundNorth China Municipal Engineering Design & Research Institute Co.Ltd

2017ZX071062022M713469Z2022Q15HJ-2021-53-HJY

2024

10.1007/s11783-024-1794-5

环境科学与工程前沿
高等教育出版社

环境科学与工程前沿

影响因子：0.545
ISSN：2095-2201
年,卷(期)：2024.18(3)
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