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Nitrite Accumulation at Low Ammonia Concentrations in Wastewater Treatment Plants

Author

Listed:
  • Hareef Ahmed Keerio

    (Department of Environment Engineering, Quaid E Awam University of Engineering, Science and Technology, Nawabshah 67450, Sindh, Pakistan
    Department of Civil and Environment Engineering, Hanyang University, Seoul 04763, Republic of Korea)

  • Wookeun Bae

    (Department of Environmental Engineering, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, Addis Ababa 16417, Ethiopia)

  • Sallahuddin Panhwar

    (Department of Civil Engineering, National University of Sciences and Technology, Quetta 24090, Balochistan, Pakistan)

Abstract

At higher ammonium concentrations, nitritation can be easily attained by picking out the inhibitor. In low-concentrated reactors, nitrite accumulation without using any chemical inhibitor is a challenging process. In this study, two continuous stirred-tank reactors (CSTR) with biofilm and without biofilm were operated with total ammonium nitrogen feed concentrations of ~50 mg/L and ~30 mg/L and effluent concentrations of ~1 mg/L. A CSTR without biofilm was operated in three phases. In phase 1, a substrate-shock concentration of 1 to 2000 mg total ammonium nitrogen (TAN)/L was tested. It was found that the shock concentration was not successful in long-term operations because nitrite-oxidizing bacteria (NOB) recovered rapidly. In phases 2 and 3, the sludge-treatment method was applied, and a high nitrite accumulation efficiency was achieved (~98%). In a CSTR with biofilm, the free ammonia shock concentration was ~91.7 mg/L, and a nitrite accumulation efficiency of ~90% was achieved.

Suggested Citation

  • Hareef Ahmed Keerio & Wookeun Bae & Sallahuddin Panhwar, 2022. "Nitrite Accumulation at Low Ammonia Concentrations in Wastewater Treatment Plants," Sustainability, MDPI, vol. 14(24), pages 1-10, December.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:24:p:16449-:d:997711
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    Cited by:

    1. Jingjing Zhu & Feifei Dou & Fesobi Olumide Phillip & Gang Liu & Huaifeng Liu, 2023. "Effect of Nitrification Inhibitors on Photosynthesis and Nitrogen Metabolism in ‘Sweet Sapphire’ ( V. vinifera L.) Grape Seedlings," Sustainability, MDPI, vol. 15(5), pages 1-18, February.

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