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Related Experiment Videos

Activated sludge immobilization using the PVA-alginate-borate method.

M An1, K V Lo

  • 1Department of Chemical and Biological Engineering, University of British Columbia, 2357 Main Mall, Vancouver, BC, V6T 1Z4 Canada.

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering
|May 31, 2001
PubMed
Summary

The PVA-alginate-borate method effectively immobilizes activated sludge, maintaining high activity and stability. This technique achieved over 90% removal of BOD5, NH4(+)-N, and TKN in a fluidized bed reactor.

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Area of Science:

  • Environmental microbiology
  • Biotechnology
  • Wastewater treatment

Background:

  • Activated sludge immobilization is crucial for efficient wastewater treatment.
  • Polyvinyl alcohol (PVA), alginate, and borate offer potential for sludge immobilization.
  • Maintaining sludge activity post-immobilization is a key challenge.

Purpose of the Study:

  • To optimize the PVA-alginate-borate method for activated sludge immobilization.
  • To evaluate the performance of immobilized sludge in a fluidized bed reactor.
  • To assess the mechanical stability and activity of the immobilized sludge.

Main Methods:

  • Immobilization of activated sludge using a PVA-alginate-borate matrix.
  • Determination of optimal PVA concentration (10-12.5%) and alginate concentration (1%).

Related Experiment Videos

  • Adjustment of boric acid pH to 7.0 to maintain sludge activity.
  • Continuous operation of a fluidized bed reactor with varying hydraulic retention times (HRT) and BOD loading.

    • Main Results:

    • Optimal PVA concentration determined to be 10-12.5% for immobilization.
    • A minimum of 1% alginate was required to prevent bead agglomeration.
    • Sludge activity was successfully maintained by adjusting boric acid pH to 7.0.
    • Over 90% removal of BOD5, NH4(+)-N, and TKN was achieved in the fluidized bed reactor.
    • Immobilized sludge demonstrated satisfactory mechanical stability.

    Conclusions:

    • The PVA-alginate-borate method is a viable technique for immobilizing activated sludge.
    • Optimized conditions ensure high removal efficiencies for key wastewater pollutants.
    • The immobilized sludge exhibits robust performance and mechanical integrity for continuous wastewater treatment.