Long-Term Fouling Control Strategies in Gravity-Driven Membrane Bioreactors (Gd-Mbrs): Impact on Process Performance and Membrane Fouling Properties
KAUST DepartmentEnvironmental Science and Engineering Program
Water Desalination and Reuse Research Center (WDRC)
Biological and Environmental Science and Engineering (BESE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/676122
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AbstractThis study aims to assess the effects of periodic physical cleanings operations in Gravity-Driven Membrane Bioreactor (GD-MBR) treating primary wastewater. The impact of each cleaning strategy on the reactor performance (permeate flux and water quality), biomass morphology, and fouling composition were evaluated. The application of air scouring coupled with intermittent filtration resulted in the highest permeate flux (4 LMH) compared to only intermittent filtration (i.e., relaxation) (1 LMH) and air scouring under continuous filtration (2.5 LMH). Air scouring coupled with relaxation led to a thin (~50 µm) but with more porous fouling layer and low hydraulic resistance, presenting the lowest concentration of extracellular polymeric substance (EPS) in the biomass. Air scouring under continuous filtration led to a thin (~50 µm), dense, compact, and less porous fouling layer with the highest specific hydraulic resistance. The employment of only relaxation led to the highest fouling deposition (~280 µm) on the membrane surface. The highest TN removal (~62%) was achieved in the reactor with only relaxation (no aeration) due to the anoxic condition in the filtration tank, while the highest COD removal (~ 60%) was achieved with air scouring under continuous filtration due to the longer aeration time and the denser fouling layer. The presented results highlighted the versatility of the GD-MBR, where the choice of the appropriate operation relies on the eventual discharge or reuse of the treated effluent.
CitationRanieri, L., Vrouwenvelder, J. S., & Fortunato, L. (2022). Long-Term Fouling Control Strategies in Gravity-Driven Membrane Bioreactors (Gd-Mbrs): Impact on Process Performance and Membrane Fouling Properties. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.4071696
SponsorsThe research reported in this paper was supported by funding from King Abdullah University of Science and Technology (KAUST), Saudi Arabia. Authors extend their gratitude to the Water Desalination and Reuse Center (WDRC) staff for their support. The authors would like to highlight the contribution of Xavier Pita, Scientific Illustrator at the King Abdullah University of Science and Technology (KAUST) for production of the Fig. 5.
JournalSSRN Electronic Journal