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Updated: Aug 22, 2025

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Achieving robust mainstream nitritation by implementing light irradiation: long-term performance and microbial

Zhaorui Chu1, Dandan Huang2, Xiaoyu Huang2

  • 1School of Civil Engineering, Guangzhou University, Guangzhou 510006, China; Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China.

Bioresource Technology
|November 11, 2022
PubMed
Summary
This summary is machine-generated.

Light irradiation effectively inhibits nitrite-oxidizing bacteria (NOB) for stable mainstream nitritation. This method enhances nitrogen removal and denitrification, offering a promising strategy for wastewater treatment.

Keywords:
Light irradiationMicrobial communityNOB suppressionNitrite shuntPartial nitritation/annamox

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Area of Science:

  • Environmental Microbiology
  • Wastewater Treatment Engineering
  • Biotechnology

Background:

  • Effective inhibition of nitrite-oxidizing bacteria (NOB) is crucial for short-cut biological nitrogen removal processes.
  • Achieving stable mainstream nitritation remains a significant challenge in wastewater treatment.

Purpose of the Study:

  • To demonstrate the efficacy of light irradiation, specifically ultraviolet-A (UVA), in achieving stable mainstream nitritation.
  • To investigate the impact of UVA irradiation on nitrogen removal efficiency and microbial community structure.

Main Methods:

  • Operation of a sequencing batch reactor (SBR) with UVA irradiation for 250 days.
  • Monitoring of nitrite accumulation, total nitrogen removal, and microbial community composition (focusing on NOB and denitrifiers).

Main Results:

  • Stable nitritation was achieved with a nitrite accumulation ratio of approximately 90%.
  • UVA irradiation significantly reduced Nitrospira (NOB) abundance from 6.0% to 0.1% without affecting Nitrosomonas.
  • Total nitrogen removal reached up to 63%, with Rhodocyclaceae enrichment contributing to enhanced denitrification.

Conclusions:

  • UVA irradiation is a viable strategy for stable mainstream nitritation and enhanced nitrogen removal.
  • This method selectively targets NOB, preserving beneficial ammonia-oxidizing bacteria.
  • The UVA irradiation approach can be integrated with existing wastewater treatment systems like A/O or IFAS.