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Salinity stresses make a difference in the start-up of membrane bioreactor: performance, microbial community and membrane fouling

  • Gan Luo
  • Zhu Wang
  • Yan LiEmail author
  • Jun Li
  • Ai-Min Li
Research Paper
  • 48 Downloads

Abstract

Start-up of membrane bioreactor under different NaCl stress was investigated in this study. Results showed that nearly 90% chemical oxygen demands and ammonia nitrogen (\(\text{NH}_{4}^{+}\)–N) was oxidized in none and 0.5% NaCl condition during the start-up stage. While 1% NaCl dramatically depressed the utilization of \(\text{NH}_{4}^{+}\)–N and about 4 weeks were required for adaption of sludge biomass to saline condition. In addition, the accumulation of nitrite high to 11.84 mg/L was observed in 1% NaCl stress, indicating the more inhibition on the activity of nitrite oxidizing bacteria. Microbial community responded to the different salinity levels. The phylum Proteobacteria and Bacteroidetes occupied over 60% in all the three MBRs. Salinity enriched the relative abundance of Maribacter, Methyloversatilis, Aeromonas and Curvibacter, while reducing the proportion of Nitrospira and Haliscomenobacter. Nitrospirae decreased sharply at 1% NaCl accounting for the accumulation of nitrite. Higher content of soluble microbial products (SMP) under saliferous MBR were released, which deteriorated the permeability of membrane module. Protein-like substances and humic substances were the main ingredients of SMP, of which the former contributed more to membrane flux decline. This study provided better understanding on the impact of salinity on the start-up of MBR.

Keywords

Membrane bioreactors Start-up Salt stress Microbial community Soluble microbial products (SMP) 

Notes

Acknowledgements

We gratefully acknowledge generous support provided by Natural Science Foundation of China (51408298 and 51608134), the Foundation for Fostering the Scientific and Technical Innovation of Guangzhou University (WZ01-2608).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

Supplementary material

449_2018_2048_MOESM1_ESM.docx (680 kb)
Supplementary material 1 (DOCX 680 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Pollution Control and Resources Reuse, School of the EnvironmentNanjing UniversityNanjingChina
  2. 2.School of Environmental Science and Engineering, Rural Non-point Source Pollution Comprehensive Management Technology Center of Guangdong Province, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of EducationGuangzhou UniversityGuangzhouChina

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