Mass transfer enhancement and improved nitrification in MABR through specific membrane configuration

Area of Science:

• Environmental Engineering
• Wastewater Treatment Technologies
• Bioreactor Design

Background:

• Aerobic biological processes in wastewater treatment plants (WWTPs) are major energy consumers, primarily due to oxygenation.
• Membrane Aerated Biofilm Reactors (MABRs) offer a promising avenue for reducing aeration energy demands and moving towards energy self-sufficiency in WWTPs.
• Effective mass transfer and optimal flow distribution are critical challenges for MABR technology.

Purpose of the Study:

• To develop and evaluate a novel MABR configuration designed for improved mass transfer between biofilm and bulk water.
• To enhance compactness, energy efficiency, and nitrification rates in laboratory-scale wastewater treatment.
• To address mass transfer limitations hindering the full potential of MABR technology.

Main Methods:

• Development of a specific, innovative MABR configuration at the laboratory scale.
• Comparative analysis of the innovative configuration against a conventional MABR setup.
• Measurement of nitrification rates and assessment of energy consumption for aeration.

Main Results:

• The innovative MABR configuration achieved significantly higher nitrification rates compared to the conventional design.
• A peak Volumetric Nitrification Rate (VNR) of 575.84 mg NH₄-N m⁻³ d⁻¹ was attained, comparable to established technologies.
• Aeration energy consumption was reduced by 83.7% relative to traditional diffuser aeration, maintaining similar Oxygen Transfer Efficiency (OTE).

Conclusions:

• The developed MABR configuration demonstrates superior performance in terms of nitrification efficiency and energy savings.
• Hydrodynamic conditions and membrane configuration are crucial factors influencing MABR treatment performance.
• This innovative approach holds significant potential for energy-efficient wastewater treatment.