[Characteristics of dynamic membrane based on oxygen microelectrode].

Area of Science:

• Environmental Engineering
• Biotechnology
• Membrane Science

Context:

• Self-forming dynamic membranes utilize coarse pore materials for solid-liquid separation in activated sludge processes.
• These membranes form a cake layer that effectively removes turbidity and organic pollutants.
• Understanding the biological activity within the dynamic membrane is crucial for optimizing bioreactor performance.

Purpose:

• To investigate the in-situ dissolved oxygen (DO) profile within a self-forming dynamic membrane during activated sludge filtration.
• To analyze the biological activity and oxygen consumption rates in the dynamic membrane using microelectrode measurements.
• To simulate the real filtration process within a small-scale bioreactor for accurate DO measurements.

Summary:

• A microelectrode was used to measure the dissolved oxygen profile within a dynamic membrane in a simulated bioreactor.
• Results showed dissolved oxygen decreased with depth, reaching zero at 2.0-2.5 mm, and bubbles emerged.
• Specific oxygen uptake rates were calculated for the dynamic membrane surface over 8 days of filtration.

Impact:

• Provides critical insights into the microbial activity and oxygen gradients within dynamic membranes.
• Highlights potential limitations in oxygen transfer within the dynamic membrane, influencing microbial processes.
• Informs the design and operation of dynamic membrane bioreactors for enhanced wastewater treatment efficiency.