Study on Correlation between Impact-Resistance Performance and Microbial Characteristics by MPSR and SBR under Transient Organic Load Shock
Publication: Journal of Environmental Engineering
Volume 150, Issue 8
Abstract
The single-cycle transient high-concentration organic load shock test was conducted on the micropressure swirl reactor (MPSR) and sequencing batch reactor (SBR) to assess their capability to different levels of transient organic load shock (OLS), including pollutant removal, sludge characteristics, and microbial characteristics. The results indicated that the impact-resistance of biological treatment systems was related to reactor structure and microbial community distribution. When subjected to transient chemical oxygen demand (COD) load of 0.81, 1.28, and , respectively, both reactors exhibited effective organic removal capabilities. Compared with MPSR, within a certain shock range, nitrification in the SBR was less affected by shock and had a higher effect on nitrogen and phosphorus removal. However, when shock load reached , the denitrification was sufficient in the MPSR, and microorganisms continued to secrete polysaccharides (PS), which was beneficial for adsorbing pollutants and resisting impacts. Under steady-state conditions, the SBR exhibited excellent nitrification with a relative abundance of 60.7% for nitrifying functional groups such as Thiothrix. Compared with the SBR, the MPSR displayed a higher microbial community diversity, with a variety of phosphorus-removing bacteria and denitrifying bacteria genera occupying aerobic and anoxic partitions within the same space, which was profitable for effective denitrification and phosphorus removal under high OLS. Besides, the enrichment of Flavobacterium and Zoogloea sp. at high concentrations significantly enhanced the MPSR’s resistance to OLS. This study provides a theoretical basis for effective measures by different processes in response to organic load shocks.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research was supported by Jilin Scientific and Technological Development Program (20210101079JC).
Author contributions: Hua Kang: writing–review and editing; investigation; formal analysis; and supervision. Yang Jiao: methodology; writing–original draft; and resources. Fan Wang: methodology, writing–review and editing; and visualization. Wenai Liu: writing–review and editing; and resources. Xuantong Liu: methodology and investigation. Shengshu Ai: formal analysis and conceptualization. Dejun Bian: supervision; and writing–review and editing.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 150 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 13, 2023
Accepted: Feb 6, 2024
Published online: May 31, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 31, 2024
ASCE Technical Topics:
- Chemical processes
- Chemistry
- Continuum mechanics
- Denitrification
- Design (by type)
- Dynamic loads
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Environmental engineering
- Load factors
- Load tests
- Microbes
- Nutrient pollution
- Organic loads
- Organisms
- Pollutants
- Pollution
- Solid mechanics
- Structural design
- Structural dynamics
- Tests (by type)
- Transient loads
- Water pollution
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