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Day/night temperature differences (DNTD) trigger changes in nutrient removal and functional bacteria in membrane
Shaoqing Zhang1, Binbin Sheng1, Wenting Lin1
1School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou 510275, China.
The Science of the Total Environment
|June 20, 2018
Summary
Daily temperature fluctuations impact wastewater treatment. High temperature differences disrupt nutrient removal and cause membrane fouling, while specific bacteria like Nitrospina and Tetrasphaera are sensitive, unlike filamentous bacteria.
Area of Science:
- Environmental microbiology
- Wastewater engineering
- Bioreactor technology
Background:
- Temperature is a critical environmental stressor in biological wastewater treatment systems.
- Daily temperature fluctuations can significantly influence microbial metabolism and community dynamics.
- Membrane bioreactors (MBRs) are widely used for efficient wastewater treatment.
Purpose of the Study:
- To investigate the impact of long-term day/night temperature differences (DNTD) on biological performance and sludge microbiota in MBRs.
- To understand the microbial responses to varying DNTD and their correlation with bioreactor efficiency and membrane fouling.
Main Methods:
- Comparative study of two MBRs with different DNTD (low: 20/30°C vs. high: 17/33°C).
- Monitoring of effluent quality parameters (COD, TN, TP) and transmembrane pressure (TMP) for membrane fouling assessment.
- 16S rRNA gene sequencing to analyze bacterial community structure and functional gene abundances.
Main Results:
- Low DNTD maintained stable nutrient removal, while high DNTD led to increased effluent COD, TN, and TP.
- High DNTD exacerbated membrane fouling, primarily due to extracellular polymeric substances (EPS) accumulation.
- Bacterial community structure remained largely unaffected by DNTD, but functional groups showed differential responses.
- Specific bacteria like Nitrospina (nitrifying bacteria) and Tetrasphaera (phosphate-accumulating organisms) were sensitive to DNTD.
- Denitrifier abundance decreased significantly under high DNTD, while filamentous bacteria showed tolerance.
Conclusions:
- DNTD significantly affects MBR performance, with high fluctuations negatively impacting nutrient removal and increasing membrane fouling.
- Microbial community structure is resilient to DNTD, but functional microbial groups exhibit varied sensitivities, influencing overall treatment efficiency.
- Filamentous bacteria demonstrate a notable tolerance to daily temperature variations, suggesting their potential role in adapting to fluctuating conditions.
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