State-of-the-Art MABR Technology for Energy-Efficient, Compact and Low N2O Emission Wastewater Solutions

The focal area of this white paper is advancing energy water resilience in wastewater treatment through the deployment of Membrane Aerated Biofilm Reactor (MABR) technology.
The proposed effort advances MABR technology as a treatment intensification solution to address energy inefficiency, greenhouse gas emissions, and operational vulnerability with conventional activated sludge (CAS) systems. By replacing bubble-based aeration with membrane mediated oxygen delivery, MABR enables enhanced oxygen transfer efficiency while substantially reducing aeration energy demand. The counter-diffusion configuration promotes stable biological nutrient removal through favorable microbial stratification, supporting simultaneous nitrification and denitrification while limiting nitrous oxide (N?O) formation. These advantages translate into lower energy consumption and reduced treatment-related greenhouse gas emissions, while sustaining performance under variable hydraulic and organic loading conditions. The attached growth nature of the technology further enhances wet weather resilience by retaining biomass, minimizing washout, and shortening recovery times following disturbances.
The broader impact of this work is the establishment of MABR as a scalable, modular, and resilient treatment platform that supports long term energy water sustainability goals. By reducing reliance on energy intensive aeration, lowering the carbon footprint of biological nutrient removal, and improving system robustness under wet weather conditions, MABR technology offers a pathway for waste resource recovery facilities (WRRFs) to transition toward low energy, low emission, and climate resilient infrastructure. The insights and performance metrics presented in this white paper are intended to support decision makers, utilities, and designers in evaluating MABR for both retrofit and new build applications, with future extensions to integrated energy water systems and net zero wastewater treatment strategies.