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Microbial mixotrophic denitrification using iron(II) as an assisted electron donor
Yuan Pan1,2, Ying-Ying Fu1, Ke Zhou1
1CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
This study demonstrates that Fe(II) can enhance mixotrophic denitrification for simultaneous nitrogen and phosphorus removal in wastewater treatment. A specific bacterium, Thermomonas, was found to be key in this iron-assisted biological process.
Area of Science:
- Environmental Science
- Microbiology
- Biotechnology
Background:
- Mixotrophic denitrification is promising for biological wastewater treatment.
- Limited research exists on Fe(II)-assisted systems and their mechanisms.
- Understanding nutrient cycling (carbon, nitrogen, phosphorus, iron) in these systems is crucial.
Purpose of the Study:
- To investigate the feasibility of using Fe(II) as an electron donor for enhanced mixotrophic denitrification.
- To elucidate the mechanisms of simultaneous nitrogen and phosphorus removal in an iron-assisted system.
- To identify key microbial players in the Fe(II)-assisted process.
Main Methods:
- Long-term reactor operation to simulate wastewater treatment conditions.
- Batch tests to analyze specific process parameters.
- Microbial community analysis to identify dominant species.
Main Results:
- Fe(II) effectively provided electrons for efficient nitrate reduction.
- Biological reactions were the primary drivers of nutrient removal.
- The bacterium *Thermomonas* was significantly enriched, reaching 60.2% abundance.
- Simultaneous removal of nitrogen and phosphorus was achieved.
Conclusions:
- Fe(II)-assisted mixotrophic denitrification is a viable process for wastewater treatment.
- The system facilitates efficient nitrogen and phosphorus removal.
- *Thermomonas* plays a critical role in this iron-assisted biological process.
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