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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Efficient nitrogen removal by multi-stage A/O mud membrane composite process with segmented influent: Performance and

Shaobo Zhang1, Dan Zhong2, Yicheng Cao1

  • 1State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China.

Environmental Research
|February 17, 2024
PubMed
Summary

A novel multi-stage A/O membrane process significantly enhances wastewater treatment. This advanced system achieves high ammonia and total nitrogen removal, alongside excellent COD reduction, outperforming traditional methods.

Keywords:
Actual wastewaterMicrobial communityMud membrane composite processSegmented influent

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Area of Science:

  • Environmental Science
  • Microbiology
  • Chemical Engineering

Background:

  • Conventional activated sludge processes face challenges in achieving high nitrogen removal efficiencies.
  • Membrane processes offer improved effluent quality but can be costly and prone to fouling.
  • Optimizing wastewater treatment requires innovative composite systems integrating biological and membrane technologies.

Purpose of the Study:

  • To develop and evaluate a novel multi-stage Anaerobic-Oxic (A/O) mud membrane composite process with segmented influent for enhanced wastewater treatment.
  • To compare the nitrogen and chemical oxygen demand (COD) removal efficiency of this new process against traditional activated sludge and pure membrane processes.
  • To investigate the microbial community structure and identify key bacteria responsible for pollutant removal in the A/O mud membrane composite reactor.

Main Methods:

  • Construction of a multi-stage A/O mud membrane composite process with segmented influent.
  • Comparative analysis with traditional activated sludge and multi-stage A/O pure membrane processes.
  • Investigation of nitrogen and COD removal under varying operational conditions.
  • Microbial community analysis using high-throughput sequencing to determine bacterial abundance and diversity.

Main Results:

  • The multi-stage A/O mud membrane composite process achieved a maximum ammonia nitrogen removal rate of 99% and an average total nitrogen removal rate of 80% under optimal conditions.
  • Chemical oxygen demand (COD) removal efficiency in the effluent reached 93%.
  • The microbial analysis revealed the highest relative abundance of Proteobacteria in the composite reactor, with high community diversity and richness in the aerobic pool. Dominant aerobic denitrifying bacteria, including Dechloromonas, Flavobacterium, and Rhodobacter, were identified as key contributors to ammonia nitrogen removal.

Conclusions:

  • The developed multi-stage A/O mud membrane composite process with segmented influent is highly effective for wastewater treatment, demonstrating superior nitrogen and COD removal efficiencies.
  • The enhanced performance is attributed to the synergistic effects of the biological treatment and membrane filtration, supported by a robust microbial community structure.
  • The identification of specific aerobic denitrifying bacteria provides insights for further optimization and potential bioaugmentation strategies in advanced wastewater treatment systems.