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A novel halophilic Exiguobacterium mexicanum strain removes nitrogen from saline wastewater via heterotrophic nitrification and aerobic denitrification
- Source :
- Bioresource Technology. 333:125189
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The utilization of halophilic bioresources is limited due to a lack of isolation and characterization work. A halophilic bacterium strain SND-01 of Exiguobacterium mexicanum was isolated in this study, which is the first report on its novel function in heterotrophic nitrification-aerobic denitrification (HN-AD). The strain SND-01 is slightly halophilic, surviving at 0 up to 9% (w/v) salinity. When utilizing ammonium, nitrate or nitrite as the sole nitrogen source in aerobic conditions, the isolated strain showed the maximum nitrogen removal rate of 2.24 ± 0.14 mg/(L·h), 3.63 ± 0.21 mg/(L·h) and 2.30 ± 0.23 mg/(L·h), respectively. Functional genes and key enzymes involved in heterotrophic-aerobic nitrogen transformations were characterized, establishing the pathway of HN-AD. The nitrogen removal via HN-AD is dependent on the C/N ratio, salinity and temperature. The halophilic Exiguobacterium mexicanum strain SND-01 shows a significant potential in biotreatment of saline wastewater in an easy and cost-effective way.
- Subjects :
- 0106 biological sciences
Environmental Engineering
Denitrification
Nitrogen
Bioengineering
Wastewater
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
Exiguobacterium
Nitrate
010608 biotechnology
Aerobic denitrification
Ammonium Compounds
Ammonium
Food science
Nitrite
Waste Management and Disposal
Nitrites
0105 earth and related environmental sciences
Renewable Energy, Sustainability and the Environment
Heterotrophic Processes
General Medicine
Nitrification
Aerobiosis
Halophile
Salinity
chemistry
Subjects
Details
- ISSN :
- 09608524
- Volume :
- 333
- Database :
- OpenAIRE
- Journal :
- Bioresource Technology
- Accession number :
- edsair.doi.dedup.....591342f0c95d73ff82b28f8973805c5c