Document Type : Original Article

Authors

• Mohsen Arbabi ¹
• Abbas Akbarzadeh ²
• Abbas Khodabakhshi ³

¹ Department of Environmental Health Engineering, School of Health, Health-Social Determinants Research Center, Shahrekord University of Medical Science, Shahrekord, Iran

² Water Research Institute, Iranian Ministry of Energy, Tehran, Iran

³ Department of Environmental Health Engineering, School of Health, Shahrekord University of Medical Science, Shahrekord, Iran

Abstract

Aims: The aim of this study was the optimization of the SBR system for enhanced biological phosphorus and nitrogen removal. Materials And Methods: A lab-scale SBR consisting filling, pre-anoxic, anerobic, anoxic, aerobic, settling, decanting, and idle phases was proposed for simultaneous enhanced biological phosphorus and nitrogen removal (SEBPNR) from wastewater. Synthetic wastewater was used in this research. Glucose was used as a carbon source. The SBR was seeded with sludge from a local municipal wastewater treatment plant. Results: The results indicates that the lab-scale SBR was capable to remove soluble phosphorus (SP), SCOD, TCOD, and ammonia, with efficiencies of around 92%, 95%, 80%, and 85%, respectively. Optimized lab-scale SBR operational condition for SEBPNR consists of a fill (15 min), pre-anoxic (30 min), anerobic (90 min), 1st aerobic (210 min), 2nd anoxic (55 min), 2nd aerobic (10 min), settling (90 min), decant (10 min), and idle (10 min) phases. Conclusion: This study concludes that effective biological removal of phosphorus and nitrogen from wastewater using SBR occurs in sufficient HRT in the anaerobic and aerobic stages, adequate COD/TP ratios (up to 35). This system is suitable for high removal of P and N in both municipal and industrial wastewater.

Keywords

• Denitrification
• enhanced biological phosphorus removal (EBPR)
• nitrification
• sequencing batch reactor (SBR)
• wastewater