[Aerobic Denitrification and Microbial Community Shift in SBR Bioaugmented with Strains YH01 and YH02]

Area of Science:

• Environmental microbiology
• Wastewater treatment engineering

Background:

• Aerobic denitrification is crucial for nitrogen removal in wastewater treatment.
• Understanding microbial community dynamics is key to optimizing treatment processes.

Purpose of the Study:

• To evaluate the enhanced aerobic denitrification capability of mixed strains YH01+YH02.
• To analyze microbial community changes during SBR operation with YH01+YH02.

Main Methods:

• High-throughput sequencing was used to analyze microbial communities in different SBR stages.
• Principal component analysis and UPGMA analysis were employed to understand community dynamics.

Main Results:

• Nitrate nitrogen (NO3--N), total nitrogen (TN), and chemical oxygen demand (COD) removal efficiencies increased by 12.1%, 9.2%, and 9.4%, respectively.
• Microbial community diversity decreased, while the relative abundance of genera like Delftia and Acidovorax increased.
• SBR operation was divided into four distinct phases based on microbial community structure.

Conclusions:

• Mixed strains YH01+YH02 demonstrate excellent compatibility and effectiveness in aerobic denitrification within SBR systems.
• The study highlights the role of specific microbial genera in enhanced nitrogen removal.
• Microbial community structure is dynamic and influences the efficiency of aerobic denitrification.