Journal
ENVIRONMENTAL POLLUTION
Volume 256, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.113294
Keywords
Denitrification; Low C/N; Metabolic characteristics; Nitrogen balance; Extracellular polymeric substance (EPS)
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Funding
- National Natural Science Foundation of China (NSFC) [51678471, 51978556]
- Shaanxi Science Fund for Distinguished Young Scholars [2019JC-31]
- Key Research and Development Program in Shaanxi Province [2018ZDXM-SF-029]
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A novel denitrifying bacterium YSF15 was isolated from the Lijiahe Reservoir in Xi'an and identified as Comamonas sp. It exhibited excellent nitrogen removal ability under low C/N conditions (C/N = 2.5) and 94.01% of nitrate was removed in 18 h, with no accumulation of nitrite. PCR amplification and nitrogen balance experiments were carried out, showing that 68.92% of initial nitrogen was removed as gas products and the nitrogen removal path was determined to be NO3--N -> NO2--N -> NO -> N2O -> N-2. Scanning electron microscopy and three-dimensional fluorescence spectroscopy were used to track extracellular polymeric substances (EPS). The results show that complete-denitrification under low C/N conditions is associated with EPS, which may provide a reserve carbon source in extreme environments. These findings reveal that Comamonas sp. YSF15 can provide novel basic materials and a theoretical basis for wastewater bioremediation under low C/N conditions. (C) 2019 Published by Elsevier Ltd.
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