Skip to the main content

Chemical and Biochemical Engineering Quarterly, Vol. 37 No. 4, 2023.

Original scientific paper

https://doi.org/10.15255/CABEQ.2023.2179

Nitrate Removal Characteristics of Nitrate-reducing Bacteria Pseudomonas sp. XS-18 at Low Carbon-to-nitrogen Ratio

L. L. Yan ; College of Resource and Environment, Northeast Agricultural University, Harbin 150030 China
M. Y. Yin ; College of Resource and Environment, Northeast Agricultural University, Harbin 150030 China
C. X. Wang ; College of Resource and Environment, Northeast Agricultural University, Harbin 150030 China
M. Y. Yang ; College of Resource and Environment, Northeast Agricultural University, Harbin 150030 China
L. T. Sun ; College of Resource and Environment, Northeast Agricultural University, Harbin 150030 China
Y. Jiao ; College of Resource and Environment, Northeast Agricultural University, Harbin 150030 China

Full text: english pdf 2.942 Kb

page 261-272

downloads: 95

cite

Abstract

Low carbon-to-nitrogen (C/N) ratios are the main characteristic of domestic wastewater. In this study, we evaluated the nitrate removal characteristics of Pseudomonas sp. XS-18 at low C/N ratios (4.0 and 6.0) and pH 11.0. We also analyzed the causes of the nitrate removal at low C/N ratios in this strain. At pH 11.0 and a C/N ratio of 4.0, the strain was effective in removing nitrate.
Additionally, the total organic carbon content decreased over time at low C/N ratios, requiring more energy to complete vital activities. Furthermore, low C/N conditions resulted in less strain secretion compared to high C/N settings, and the polysaccharide content degraded more quickly than protein over time. To provide a carbon source for the nitrate reduction process, strains with low C/N ratio and high pH secreted more soluble microbial by-products. This strain is able to metabolize its own secreted extracellular polymeric substances as a carbon source to enhance nitrate removal.







This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

aerobic nitrate reduction; low C/N ratio; high pH; extracellular polymeric substances; nitrate assimilation process

Hrčak ID:

313515

URI

https://hrcak.srce.hr/313515

Publication date:

19.1.2024.

Visits: 341 *