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[Flow model of internal-loop granular sludge bed nitrifying reactor].

Gang Lu1, Ping Zheng

  • 1Department of Environmental Engineering, Zhejiang University, Hangzhou 310029 , China.

Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology
|June 24, 2005
PubMed
Summary

Tracer tests reveal the internal-loop granular sludge bed reactor exhibits excellent structural performance. Its flow pattern, modeled as a plug flow reactor and continuously stirred tank reactor in series, accurately predicts hydraulic retention time.

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Area of Science:

  • Environmental Engineering
  • Biochemical Engineering
  • Fluid Dynamics

Context:

  • Internal-loop granular sludge bed reactors are advanced aerobic nitrifying equipment with significant potential.
  • Understanding fluid dynamics is crucial for optimizing reactor design and performance.
  • Tracer tests are a standard method for analyzing flow patterns in chemical and environmental reactors.

Purpose:

  • To investigate the flow patterns within an internal-loop granular sludge bed nitrifying reactor.
  • To develop a reliable flow model for the reactor using experimental data.
  • To assess the reactor's structural performance and dead space percentage.

Summary:

  • Tracer tests using pulse stimulus-response technique were conducted on an internal-loop granular sludge bed nitrifying reactor.

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  • The settling section exhibited plug flow characteristics (dispersion number D/uL = 0.00148), while the circulating section behaved like a continuously stirred tank reactor (series number N = 1.021).
  • A series model of continuously stirred tank reactor and plug flow reactor was constructed, accurately predicting the hydraulic retention time distribution with an 8.56% relative error.

    • Impact:

    • The study provides a validated flow model for the internal-loop granular sludge bed nitrifying reactor.
    • Results lay the foundation for developing kinetic models, aiding in reactor design and operational optimization.
    • The excellent structural performance and low dead space percentage (5.22%) indicate efficient reactor operation.