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Suspended membrane bioreactor with extracellular polymeric substances as reserve carbon source for low carbon to nitrogen ratio wastewater: Performance and microbial community composition

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Abstract

A suspended membrane bioreactor (SMBR) was employed to treat low carbon to nitrogen (C/N) ratio wastewater. The suspended membranes amplified by Comamonas sp. YSF15 were collected to develop the SMBR, which showed excellent performance for nitrate (NO3) removal. The maximum nitrate removal efficiency of 95.22% was obtained at an initial nitrate concentration of 20 mg L−1, HRT of 6 h, and C/N=2.5: 1 (molar ratio). In addition, the polysaccharide (PS) and protein (PN) compositions of the soluble microbial products (SMP), extracellular polymeric substances (EPS) and the Fourier transform infrared (FTIR) spectra indicated that the suspended membrane utilized its SMP and EPS as reserve C source to achieve higher denitrification performance under the low C/N ratio. With the increase of pH, the generated SMP and EPS in SMBR continued to increase. The increase in PS content was significantly greater than that of PN, thus forming a suspended membrane with a certain mechanical strength. High-throughput sequencing data indicated that Comamonas sp. YSF15 played a key role in effective nitrate removal by SMBR. It can adapt to a nutrient-deficient environment, especially low (C/N) ratio, and greatly increase in the late operation of the reactor.

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Acknowledgements

This research work was partly supported by the National Natural Science Foundation of China (NSFC) (No. 51678471), Shaanxi Science Fund for Distinguished Young Scholars (No. 2019JC-31) and The Key Research and Development Program in Shaanxi Province (2018ZDXM-SF-029).

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Authors and Affiliations

  1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Min Li, Junfeng Su, Yifei Li, Amjad Ali, Shu Yang & Shuai Zhang

  2. Shaanxi Key Laboratory of Environmental Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Min Li, Junfeng Su, Yifei Li, Amjad Ali, Shu Yang & Shuai Zhang

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  1. Min Li
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Correspondence to Junfeng Su or Amjad Ali.

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Min Li: Investigation, Methodology, Writing — Original Draft, Junfeng Su: Reviewing, Conceptualization, Methodology, Supervision, YiFei Li: Investigation, Data Curation, Amjad Ali: Writing-Reviewing and Editing, Shu Yang: Investigation, Data Curation. Shuai Zhang: Writing and Investigation.

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11814_2021_841_MOESM1_ESM.pdf

Suspended membrane bioreactor with extracellular polymeric substances as reserve carbon source for low carbon to nitrogen ratio wastewater: Performance and microbial community composition

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Li, M., Su, J., Li, Y. et al. Suspended membrane bioreactor with extracellular polymeric substances as reserve carbon source for low carbon to nitrogen ratio wastewater: Performance and microbial community composition. Korean J. Chem. Eng. 38, 1870–1879 (2021). https://doi.org/10.1007/s11814-021-0841-1

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  • DOI: https://doi.org/10.1007/s11814-021-0841-1

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