Unveiling performance stability and its recovery mechanisms of one-stage partial nitritation-anammox process with airlift enhanced micro-granules

Hong Chen, Hong Wang, Rong Chen, Sheng Chang, Yu Yao, Changbo Jiang, Sha Wu, Yanxiao Wei, Guanlong Yu, Min Yang, Yu You Li

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The performance stability and its recovery mechanisms of a partial nitritation-anammox process were investigated. A one-stage airlift enhanced micro-granules (AEM) system was operated for 650 days continuously to treat 50 mg-NH4/L wastewater. During the stable stage, a high nitrogen removal efficiency of 72.7 ± 8.4% lasting for 230 days was successfully achieved under 0.28 L/min aeration rate and 0.10–0.20 mg/L dissolved oxygen (DO) concentration. A microbial consortium with good granularity appeared in red. The specific activity of anammox and ammonia oxidation increased to 1.02 and 0.93 g-N/g-VSS/d, respectively. Meanwhile, the microbial analysis showed the AEM system shifted the dominant microflora from Proteobacteria to Planctomycetes in which Candidatus Brocadia abundance reached a high of 35.0%. The results reveal that the long-term airlift-aeration promoted granulation and further enhanced activities, the abundances of anammox bacteria, and suppressed nitrite-oxidizing bacteria. Optimizing the DO control is also critical for stability increment and process recovery.

Original languageEnglish
Article number124961
JournalBioresource Technology
Volume330
DOIs
Publication statusPublished - 2021 Jun

Keywords

  • Airlift-aeration
  • Micro-granules
  • Partial nitritation-anammox (PN/A)
  • Recovery
  • Stability

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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