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BICT biological process for nitrogen and phosphorus removal.

Y Huang1, Y Li, Y Pan

  • 1Department of Environmental Science and Engineering, University of Science and Technology of Suzhou, New District, Suzhou 215011, China. yhuang@mail.usts.edu.cn

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|November 13, 2004
PubMed
Summary

The Bi-Cyclic Two-Phase (BICT) process enhances biological nutrient removal, achieving over 80% total nitrogen and 90% total phosphorus removal. This stable system optimizes wastewater treatment for improved effluent quality.

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Water Treatment Technologies

Background:

  • Conventional biological nutrient removal processes face challenges in stability and reliability.
  • Optimizing operational conditions is crucial for efficient nitrogen and phosphorus removal.
  • The need for advanced wastewater treatment systems with enhanced nutrient removal capabilities.

Purpose of the Study:

  • To introduce and investigate an updated Bi-Cyclic Two-Phase (BICT) biological process.
  • To enhance the stability and reliability of biological nutrient removal.
  • To explore process configuration and operation modes for optimizing nutrient removal.

Main Methods:

  • The BICT process integrates attached-growth and suspended-growth reactors, including sequencing batch reactors and an anaerobic biological selector.

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  • Extensive laboratory experiments were conducted using municipal sewage and synthetic wastewater.
  • Key operational parameters influencing COD, nitrogen, and phosphorus removal were analyzed.

    • Main Results:

    • The BICT process demonstrated strong and stable chemical oxygen demand (COD) removal capabilities.
    • Total nitrogen (TN) removal rates exceeded 80%, with effluent concentrations below 15 mg/L for municipal wastewater.
    • Total phosphorus (TP) removal rates surpassed 90%, with effluent concentrations below 1.0 mg/L.
    • Improved phosphorus removal was achieved at a short sludge retention time (SRT).

    Conclusions:

    • The BICT process offers a stable and reliable method for biological nutrient removal.
    • Optimizing supernatant recycling flow rates is critical for effective nitrogen removal.
    • The BICT process shows significant potential for enhancing wastewater treatment efficiency and effluent quality.