Abstract
An efficient immobilized denitrification bioreactor functioning under anaerobic conditions was developed by combining bacterial immobilization technology with iron-carbon (Fe–C) particles. The effects of key factors on nitrate (NO3−–N) removal efficiency were invested, such as the carbon-nitrogen ratio (C/N), pH and hydraulic retention time (HRT). Experimental results show that 100.00% NO3−–N removal efficiency and a low level of nitrite (NO2−–N) accumulation less than 0.05 mg L−1 were obtained under the condition of a C/N ratio of 3, pH 7.0 and HRT of 6 h. Meteorological chromatographic analysis showed that the final product of denitrification was mainly nitrogen (N2). The main component of precipitation formed in the bioreactor was characterized as Fe3O4 by X-ray diffraction. High-throughput sequencing analysis indicated that the dominant bacterial class in the Fe–C bioreactor was Gammaproteobacteria, while the dominant genera were Zoogloea and Azospira, the relative abundances of which were as high as 23.25 and 15.43%, respectively.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: No. 51678471, No. 51978556
Funding source: Shaanxi Science Fund for Distinguished Young Scholars
Award Identifier / Grant number: No. 2019JC-31
Funding source: Key Research and Development Program in Shaanxi Province
Award Identifier / Grant number: 2018ZDXM-SF-029
- Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission. 
- Research funding: This research work was partly supported by the National Natural Science Foundation of China (NSFC) (No. 51678471, No. 51978556), Shaanxi Science Fund for Distinguished Young Scholars (No. 2019JC-31) and The Key Research and Development Program in Shaanxi Province (2018ZDXM-SF-029). 
- Conflict of interest statement: The authors declare no conflicts of interest regarding this article. 
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Articles in the same Issue
- Frontmatter
- Articles
- Performance and microbial community of a novel PVA/iron-carbon (Fe–C) immobilized bioreactor for nitrate removal from groundwater
- Modeling of dry reforming of methane for hydrogen production at low temperatures using membrane reactor
- Formation mechanism and chaotic reinforcement elimination of the mechanical stirring isolated mixed region
- CFD-DEM simulation of powders clogging in a packed bed with lateral inlet
- Degradation of basic violet 16 dye by electro-activated persulfate process from aqueous solutions and toxicity assessment using microorganisms: determination of by-products, reaction kinetic and optimization using Box–Behnken design
- Propargyloligosilazane matrixed composite for high temperature material combining polymer and ceramic properties
- An application of continuous flow microreactor in the synthesis and extraction of rabeprazole
- Numerical study on gas–liquid two-phase flow and mass transfer in a microchannel
- A new two-layer passive micromixer design based on SAR-vortex principles
Articles in the same Issue
- Frontmatter
- Articles
- Performance and microbial community of a novel PVA/iron-carbon (Fe–C) immobilized bioreactor for nitrate removal from groundwater
- Modeling of dry reforming of methane for hydrogen production at low temperatures using membrane reactor
- Formation mechanism and chaotic reinforcement elimination of the mechanical stirring isolated mixed region
- CFD-DEM simulation of powders clogging in a packed bed with lateral inlet
- Degradation of basic violet 16 dye by electro-activated persulfate process from aqueous solutions and toxicity assessment using microorganisms: determination of by-products, reaction kinetic and optimization using Box–Behnken design
- Propargyloligosilazane matrixed composite for high temperature material combining polymer and ceramic properties
- An application of continuous flow microreactor in the synthesis and extraction of rabeprazole
- Numerical study on gas–liquid two-phase flow and mass transfer in a microchannel
- A new two-layer passive micromixer design based on SAR-vortex principles