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Related Experiment Videos

Function of dynamic membrane in self-forming dynamic membrane coupled bioreactor.

Y Wu1, X Huang, X Wen

  • 1Environment Simulation and Pollution Control State Key Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|July 12, 2005
PubMed
Summary

The Self-Forming Dynamic Membrane Coupled Bioreactor (SFDMBR) effectively removes organic matter and total nitrogen. Its dynamic membrane, composed of activated sludge, plays a key role in pollutant removal within the bioreactor system.

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Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Water Treatment

Background:

  • Membrane bioreactors (MBRs) are crucial for wastewater treatment.
  • Conventional MBRs utilize micro-/ultra-filtration membranes, facing challenges like high costs and low flux.
  • Self-Forming Dynamic Membrane Coupled Bioreactors (SFDMBRs) offer an alternative using coarse pore materials.

Purpose of the Study:

  • To investigate the pollutant removal functions of the dynamic membrane (DM) in SFDMBRs.
  • To understand the composition and role of the activated sludge layer in pollutant removal.
  • To analyze the impact of DM on various pollutants including organic matter, nitrogen compounds, and dissolved organic carbon (DOC).

Main Methods:

  • Utilized a Self-Forming Dynamic Membrane Coupled Bioreactor (SFDMBR) system.

Related Experiment Videos

  • Characterized the dynamic membrane formed from activated sludge on coarse pore material.
  • Quantified the removal of organic matter, total nitrogen, colloids, organic nitrogen, DOC, ammonia nitrogen, and nitrate nitrogen.
  • Measured dissolved oxygen (DO) concentration profiles within the dynamic membrane.
  • Assessed organic degradation and nitrification activities of biomass inside and outside the DM.

    • Main Results:

    • The dynamic membrane (DM) effectively removed an average of 12.6 mg/L of organic matter and 3.01 mg/L of total nitrogen.
    • Partial removal of colloids and organic nitrogen was observed.
    • Removal rates for DOC, ammonia nitrogen, and nitrate nitrogen varied, influenced by biological activities like nitrification.
    • DO concentration within the DM decreased with depth, reaching zero at 1.5-2.5 mm.
    • Biomass in the bioreactor showed higher organic degradation and nitrification activity compared to the DM biomass, likely due to lower DO and pollutant levels in the DM.

    Conclusions:

    • The dynamic membrane in SFDMBRs, formed by activated sludge, significantly contributes to organic matter and total nitrogen removal.
    • The varying removal efficiencies for specific nitrogen compounds and DOC highlight the complex interplay of biological processes within the DM.
    • Lower DO and organic pollutant concentrations within the DM may limit its biological activity compared to suspended biomass.