4.8 Article

Denitrifying bacteria immobilized magnetic mycelium pellets bioreactor: A new technology for efficient removal of nitrate at a low carbon-to-nitrogen ratio

期刊

BIORESOURCE TECHNOLOGY
卷 347, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126369

关键词

Immobilized bioreactor; Low C/N ratio; Magnetic mycelium pellets; Nitrate removal; Pseudomonas stutzeri sp. GF2

资金

  1. National Natural Science Foundation of China, China (NSFC) [51978556, 51678471]
  2. Shaanxi Science Fund for Distinguished Young Scholars, China [2019JC-31]
  3. Youth Innovation Team Construction Scientific Research Project of Shaanxi Education Department [21JP064]

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This study successfully integrated spores and magnetite to form magnetic mycelium pellets as bio-carriers immobilized with denitrifying bacteria in a bioreactor. The results showed that under specific carbon-to-nitrogen ratio and hydraulic retention time conditions, the bioreactor had high nitrate removal efficiency and microbial activity.
This study integrated spores and magnetite (Fe3O4) to form magnetic mycelium pellets (MMP) as bio-carriers immobilized with denitrifying bacteria in a bioreactor. Different carbon-to-nitrogen (C/N) ratios and hydraulic retention time (HRT) were established for investigating the performance of the bioreactor. The nitrate removal efficiency was 98.14% at C/N = 2.0 and HRT = 6 h. Gas chromatography (GC) results indicated that the main component of the produced gas was N-2. Fe3O4 was well-integrated into MMP according to X-ray diffraction (XRD) results and infrared spectrometer (FTIR) analysis. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that bacteria were successfully immobilized on MMP. Fluorescence excitation-emission matrix (EEM) indicated that functional bacteria GF2 might enhance the metabolic activity of the microbial community in the bioreactor and microbial activity was highest at C/N = 2.0. Pseudomonas stutzeri sp. GF2 might be immobilized and had a major role in the bioreactor according to high throughput sequencing results.

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