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Related Experiment Videos

[Experiment study on anoxic phosphate accumulation with nitrite].

Xiao-ling Zhang1, Lei Wang, Zhi-ying Wang

  • 1School of Environmental Science and Engineering, Chang'an University, Xi'an 710064, China.

Huan Jing Ke Xue= Huanjing Kexue
|July 21, 2006
PubMed
Summary
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Nitrite effectively facilitates biological phosphorus removal in Sequencing Batch Reactors (SBRs) as an electron acceptor. This study optimized conditions for granular sludge formation, achieving over 90% nitrogen and phosphorus removal efficiency.

Area of Science:

  • Environmental Microbiology
  • Wastewater Treatment Engineering

Context:

  • Biological phosphorus removal is crucial for preventing eutrophication.
  • Denitrifying phosphorus removal (DPR) offers a sustainable alternative to conventional methods.
  • Sequencing Batch Reactors (SBRs) are versatile for advanced wastewater treatment.

Purpose:

  • To investigate the efficacy of nitrite as an electron acceptor for biological phosphorus removal.
  • To study the influence of nitrite feeding modes on DPR performance.
  • To cultivate and characterize denitrifying granular sludge in an SBR.

Summary:

  • Nitrite was confirmed as an effective electron acceptor for biological phosphorus removal in an SBR, with anoxic phosphorus assimilation rates reaching 10.44 mg/(g·h) and accounting for over 97% of total assimilation.

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  • Optimal operational conditions were identified for forming granular sludge with significant denitrifying phosphorus removal activity.
  • The developed granular sludge exhibited excellent performance, with COD removal loading up to 1.5 kg/(m³·d) and over 90% removal efficiency for both nitrogen and phosphorus.

    • Impact:

    • Demonstrates a novel approach for enhanced biological phosphorus removal using nitrite.
    • Provides insights into granular sludge formation for efficient wastewater treatment.
    • Highlights the potential for achieving high nutrient removal efficiencies in SBR systems.