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Phosphorus removal from SBR with controlled denitrification for weak sewage
1Dept of Civil and Environmental Engineering, Korea University, 1 Anamdong, Seoul 136-701, Korea.
Summary
Nitrate inhibition in wastewater treatment is reduced by storing nitrate nitrogen (NO3N). This method maximizes volatile fatty acid (VFA) use for enhanced phosphorus removal, achieving low effluent levels.
Area of Science:
- Environmental Engineering
- Wastewater Treatment
- Nutrient Removal
Background:
- Sequencing Batch Reactors (SBRs) often struggle with phosphorus removal from weak sewage.
- Nitrate nitrogen (NO3N) inhibition is a primary cause of poor phosphorus removal in these systems.
Purpose of the Study:
- To investigate the effectiveness of NO3N storage in mitigating inhibition and improving phosphorus removal in SBRs.
- To maximize the utilization of volatile fatty acids (VFAs) for enhanced biological phosphorus removal.
Main Methods:
- Implementation of a NO3N storage strategy within the SBR process.
- Operation with specific influent conditions: BOD of 100 mg/L and VFA of 30 mg/L.
- Utilizing an 8-hour operational cycle.
Main Results:
- Achieved a maximum removable nitrogen and phosphorus of approximately 25 mg/L.
- Demonstrated maximized VFA utilization for phosphorus removal due to NO3N storage.
- Reported generally low effluent levels of nitrogen and phosphorus at 11 mg/L and 1 mg/L, respectively.
Conclusions:
- NO3N storage is an effective strategy to overcome inhibition and enhance phosphorus removal in SBRs treating weak sewage.
- The implemented method successfully improved nutrient removal efficiency, leading to significantly reduced effluent phosphorus concentrations.