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Subtle magnesium liberation of self-fabricated functional filler actuates highly efficient phosphorus removal from source-separated urine by SBBR

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Abstract

Domestic wastewater source-separated treatment has attracted wide attention due to the efficiency improvement of sewage treatment systems, energy saving, resource reuse, and the construction and operation cost saving of pipeline networks. Nonetheless, the excess source-separated urine still demands further harmless treatment. Sequencing batch biofilm reactor (SBBR), a new type of composite biofilm reactor developed by filling different fillers into the sequential batch reactor (SBR) reactor, has higher pollutant removal performance and simpler operation and maintenance. However, the phosphorus removal ability of the SBBR filling with conventional fillers is still limited and needs further improvement. In this study, we developed two new fillers, the self-fabricated filler A and B (SFA/SFB), and compared their source-separated urine treatment performance. Long-term treatment experimental results demonstrated that the SBBR systems with different fillers had good removal performance on the COD and TN in the influent, and the removal rate increased with the increasing HRT. However, only the SBBR system with the SFA showed excellent PO43−-P and TP removal performance, with the removal rates being 83.7 ± 11.9% and 77.3 ± 13.7% when the HRT was 1 d. Microbial community analysis results indicated that no special bacteria with strong phosphorus removal ability were present on the surface of the SFA. Adsorption experimental results suggested that the SFA had better adsorption performance for phosphorus than the SFB, but it could not always have stronger phosphorus adsorption and removal performance during long-term operation due to the adsorption saturation. Through a series of characterizations such as SEM, XRD, and BET, it was found that the SFA had a looser structure due to the use of different binder and production processes, and the magnesium in the SFA gradually released and reacted with PO43− and NH4+ in the source-separated urine to form dittmarite and struvite, thus achieving efficient phosphorus removal. This study provides a feasible manner for the efficient treatment of source-separated urine using the SBBR system with self-fabricated fillers.

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Funding

This work was supported by the Major projects of the National Social Science Fund (21ZDA028).

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Authors and Affiliations

  1. College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China

    Weinan Zhang, Ke Bei, Zhan Jin, Min Zhao, Suqing Wu, Shunfeng Jiang, Huachang Jin & Xiangyong Zheng

  2. National and Local Joint Engineering Research Center of Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China

    Weinan Zhang, Ke Bei, Zhan Jin, Min Zhao, Suqing Wu, Shunfeng Jiang, Huachang Jin & Xiangyong Zheng

  3. Zhejiang Provincial Engineering Laboratory for Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China

    Weinan Zhang, Ke Bei, Zhan Jin, Min Zhao, Suqing Wu, Shunfeng Jiang, Huachang Jin & Xiangyong Zheng

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  1. Weinan Zhang
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Contributions

Weinan Zhang: investigation, data curation, writing—original draft, conceptualization, methodology.

Ke Bei: validation, investigation, data curation.

Zhan Jin: validation, investigation, data curation.

Min Zhao: supervision, project administration.

Suqing Wu: data curation, methodology.

Shunfeng Jiang: writing—original draft, conceptualization, methodology.

Huachang Jin: validation, investigation, data curation, writing—original draft.

Xiangyong Zheng: validation, investigation, data curation, writing—original draft, conceptualization, methodology, funding acquisition.

Corresponding author

Correspondence to Xiangyong Zheng.

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Highlights

• Subtle magnesium liberation filler was applied in SBBR system for urine treating.

• SBBR system with the SFA showed excellent phosphorus removal performance.

• Dittmarite and struvite were formed by gradually released magnesium.

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Zhang, W., Bei, K., Jin, Z. et al. Subtle magnesium liberation of self-fabricated functional filler actuates highly efficient phosphorus removal from source-separated urine by SBBR. Environ Sci Pollut Res 31, 24360–24374 (2024). https://doi.org/10.1007/s11356-024-32727-x

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