The effects of low oxidation-reduction potential on the performance of full-scale hybrid membrane-aerated biofilm reactors

Monitoring biofilm thickness using the membrane aerated biofilm reactor (MABR) fingerprint soft sensor to optimize nitrogen removal

“…The unique advantages of counter‐current diffusion occurring within MABR biofilms result in increased interest in various MABR configurations for nitrogen removal, for example, the hybrid mode with suspended microbial growth (Carlson et al, 2021; Downing & Nerenberg, 2008; Landes et al, 2011); MABRs combined with other downstream biological processes (Ahmar Siddiqui et al, 2022; Wu et al, 2017); and MABRs designed for multiple bioprocesses within the biofilm (Lu et al, 2022; Siriweera et al, 2023). Installation of commercialized MABR cassettes into existing activated sludge bioreactors to extend process capacity for wastewater treatment plants (WWTPs) around the globe to deal with more stringent discharge restrictions represents one such emerging application (Heffernan et al, 2017; Uri‐Carreño et al, 2023). Consequently, expedient and punctual biofilm monitoring and control are of increasing concern and necessity to maintain stable and optimal MABR performance.…”

Nitrous Oxide Emissions from Two Full-Scale Membrane-Aerated Biofilm Reactors

“…In March 2020, due to COVID lockdowns in Denmark, the NH x sensors could not be appropriately maintained, and therefore NH x online data was excluded for EF N2O calculations (both R1 and R2). In early June 2020, a chemical cleaning was carried out in R2 (which is better described in Uri-Carreño et al, 2022), and the three weeks of operation following that chemical cleaning were deemed as "startup period" and were left out of the EF N2O calculations.…”

Membrane Surface Woven Nylon Fillers Enhance Carbon and Nitrogen Removal of Membrane-Aerated Biofilm Reactor

“…However, the traditional biological treatment technologies were no longer adequate to meet the present requirements for upgrading wastewater treatment plants and achieving energy conservation . Membrane-aerated biofilm reactors (MABRs), with their efficacy in simultaneous nitrogen and carbon removal, are increasingly favored as a process enhancement option for wastewater treatment plants (WWTPs). − The oxygen within the membrane chamber is conveyed through the permeable membrane via bubble-free aeration and is delivered directly to the biofilm on the membrane surface, significantly reducing aeration energy consumption . In the MABR system, oxygen and substrates in the wastewater undergo counter-diffusion from both sides of the biofilm to facilitate efficient mass transfer. ,, As the biofilm thickens in the MABR system, microbial consumption reduces oxygen levels, generating diverse gradients.…”

“…Biological nitrogen removal processes are the most prevalent and cost-effective technologies for treating domestic sewage. 1 However, the traditional biological treatment technologies were no longer adequate to meet the present requirements for upgrading wastewater treatment plants and achieving energy conservation. 2 Membrane-aerated biofilm reactors (MABRs), with their efficacy in simultaneous nitrogen and carbon removal, are increasingly favored as a process enhancement option for wastewater treatment plants (WWTPs).…”

“…The organic carbon and nitrogen from wastewater are the primary removal targets of wastewater treatment processes. Biological nitrogen removal processes are the most prevalent and cost-effective technologies for treating domestic sewage . However, the traditional biological treatment technologies were no longer adequate to meet the present requirements for upgrading wastewater treatment plants and achieving energy conservation .…”