Journal
BIORESOURCE TECHNOLOGY
Volume 321, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124447
Keywords
Denitrification; Micro-electrolysis; Nitrate removal; PPC@FeC bioreactor
Funding
- National Natural Science Foundation of China, China (NSFC) [51978556, 51678471]
- Shaanxi Science Fund for Distinguished Young Scholars, China [2019JC-31]
- Key Research and Development Program in Shaanxi Province, China [2018ZDXM-SF-029]
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A novel bioreactor composed of porous polymer carriers and iron-carbon was established to effectively remove nitrate under short hydraulic retention times and low carbon-to-nitrogen ratios. High-throughput sequencing revealed that Zoogloea sp. L2 was the dominant strain responsible for nitrate removal in the bioreactor.
In the current research, a novel bioreactor composed of porous polymer carriers and iron-carbon (PPC@FeC) was established through bacterial immobilized technology. The influence of key factors was studied on the nitrate removal performance of the PPC@FeC bioreactor. The experimental results showed that the highest removal rate of nitrate (7.33 mg L-1 h(-1)) can be obtained with short hydraulic retention times (HRT = 2.0 h) and low carbon-to-nitrogen ratio (C/N = 2.0). The results of high-throughput sequencing revealed that Zoogloea sp. L2 was the dominant strain in bioreactor responsible for nitrate removal. Moreover, the SEM and XRD analyses elucidated that Fe2O3 was the final product produced by the interaction of FeC and strain L2. These findings showed that the PPC@FeC bioreactor successfully combined micro-electrolysis and biological denitrification, which exhibited great potential in removing nitrate effectively from wastewater under low C/N ratio and short HRT conditions.
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