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An enhanced biological phosphorus removal (EBPR) control strategy for sequencing batch reactors (SBRs)
1Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA.
Summary
This study optimized enhanced biological phosphorus removal (EBPR) in Sequencing Batch Reactors (SBRs) by controlling aerobic polyhydroxyalkanoate (PHA) dynamics. Adjusting aeration time ensures efficient phosphate uptake, generating reserve capacity for influent variations.
Area of Science:
- Environmental Engineering
- Microbiology
- Wastewater Treatment
Background:
- Enhanced biological phosphorus removal (EBPR) is crucial for wastewater treatment.
- Previous research focused on anaerobic polyhydroxyalkanoate (PHA) formation.
- Aerobic PHA dynamics and phosphate uptake regulation require further investigation.
Purpose of the Study:
- To develop a control strategy for EBPR in Sequencing Batch Reactors (SBRs).
- To investigate factors governing aerobic PHA dynamics during phosphate (P) uptake.
- To optimize regulation of PHA use and P uptake during the aerated phase.
Main Methods:
- Investigated the impact of influent COD, influent P, and aeration time on PHA dynamics and P uptake.
- Monitored PHA oxidation and P uptake during the aerated react phase.
- Adjusted aeration time to match P uptake requirements.
Main Results:
- Influent COD, influent P, and aeration time critically influenced PHA use and P uptake.
- Excessive aeration led to unnecessary PHA oxidation in the absence of extracellular P.
- Adjusting aeration time to match P uptake sustained residual PHA and generated excess phosphate uptake reaction potential (PRP).
Conclusions:
- Aeration time is a critical control parameter for EBPR in SBRs.
- Optimized aeration prevents unnecessary PHA loss and builds PRP for handling influent P fluctuations.
- Residual PHA can be maintained to manage high influent COD events and enhance P removal resilience.