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Improved Biological Phosphorus Removal under Low Solid Retention Time Regime in Full-Scale Sequencing Batch Reactor

Author

Listed:
  • Ghazal Srivastava

    (Environmental Engineering Group, CED, IIT Roorkee, Roorkee 247667, Uttarakhand, India)

  • Aparna Kapoor

    (SFC, C. Tech. SBR Technologies Limited, Mumbai 400705, Maharashtra, India)

  • Absar Ahmad Kazmi

    (Environmental Engineering Group, CED, IIT Roorkee, Roorkee 247667, Uttarakhand, India)

Abstract

Enhanced biological phosphorus removal (EBPR) is an obscure but economical and helpful technology for removing phosphorus biologically from wastewater. A 3-MLD capacity pre-anoxic selector-attached sequencing batch reactor (SBR) treated municipal wastewater from the residents of IIT Roorkee. The treatment in the plant satisfied the effluent discharge standards in all respects except phosphorus, observed during an intensive two-year study. An elaborated 80-day study was performed to enhance and improve the plant’s performance in terms of phosphorus removal specifically, with run 1: solid retention times (SRT) reduced from 56 to 20 days (t = 35 d), run 2: lowering the diffuser’s running time from 15 min to 10 min in anoxic cum anaerobic selector chambers (dissolved oxygen (DO) concentration reduced to <0.15 mg/L) along with reducing SRT to 15 days (t = 25 d), and run 3:intensive reduction in SRT to ≤10 days (t = 20 d). During run 3, the increment in the enhanced biological phosphorus removal (EBPR) efficiency was three times that of the initial run (η max ~65%) with a readily biodegradable chemical oxygen demand to total phosphorus ratio (rbCOD/TP) of 7.8. The 16SrRNA sequencing revealed the microbial community structure before and after the changes in SRT and EBPR efficiencies, to correlate the biochemical processes and functional organisms.

Suggested Citation

  • Ghazal Srivastava & Aparna Kapoor & Absar Ahmad Kazmi, 2023. "Improved Biological Phosphorus Removal under Low Solid Retention Time Regime in Full-Scale Sequencing Batch Reactor," Sustainability, MDPI, vol. 15(10), pages 1-22, May.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:10:p:7918-:d:1145061
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    1. Holger Daims & Elena V. Lebedeva & Petra Pjevac & Ping Han & Craig Herbold & Mads Albertsen & Nico Jehmlich & Marton Palatinszky & Julia Vierheilig & Alexandr Bulaev & Rasmus H. Kirkegaard & Martin vo, 2015. "Complete nitrification by Nitrospira bacteria," Nature, Nature, vol. 528(7583), pages 504-509, December.
    2. Bo Li & Guangxue Wu, 2014. "Effects of Sludge Retention Times on Nutrient Removal and Nitrous Oxide Emission in Biological Nutrient Removal Processes," IJERPH, MDPI, vol. 11(4), pages 1-17, March.
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