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Fouling behaviour of industrial waste-based ceramic membrane in anaerobic membrane bioreactor treating low strength wastewater

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Abstract

This work describes the fouling of industrial waste sugarcane bagasse ash ceramic membrane (pore size ~ 8.6 µm; water permeability 27.2 × 103 L/m2 h bar) in wastewater treatment in anaerobic membrane bioreactor (AnMBR). AnMBR system was operated in sequential batch reactor (SBR) mode at 18 h hydraulic retention time for 31 days. For influent concentration of 171 ± 12 mg COD/L, average chemical oxygen demand (COD) removal was high (~ 94%). Biomass activity of anaerobic sludge improved from 0.15 (day 1) to 0.35 mg CODremoved/mg MLVSS.d (day 31). Operating flux was maintained at 17.8 ± 1.4 L/m2 h and the transmembrane pressure reached up to 170 mbar on day 31, increasing at a rate of 15.7 mbar/d. Specific bound extracellular polymeric substance (EPS) concentration was much higher in surface deposits (356 mg EPS/g MLVSS) than in the reactor sludge suspension (32.3 ± 14.4 mg EPS/g MLVSS). Though SBR is a good alternative configuration to reduce membrane exposure to sludge and hence control the fouling rate, formation of cake layer (due to deposition of sludge fines on membrane surface) still cannot be prevented. Calculation of total filtration resistance (Rt) showed the resistance of the caked surface deposits, Rc (2.19 × 1012 m−1) to be dominant at 83% of Rt. Of the two fouling control strategies tested viz. filtration-relaxation (4 min–1 min) and permeate backflushing (up to 3 times operating flux), backflushing was more effective. These findings indicate the potential of these alternative membranes in wastewater treatment application; at the same time, further investigations are required to minimize membrane fouling.

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Acknowledgements

The authors are thankful to TERI for the research facility to conduct this work. The membrane mercury porosimetry analysis done by R. K. Singh, TERI is also greatly appreciated. The constructive comments provided by the anonymous reviewer that helped us to improve the manuscript are much appreciated.

Funding

S. Dhiman is grateful to University Grants Commission for Junior and Senior Research Fellowship (UGC Ref. No. 3781/NET-DEC2018).

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SD: Conducting AnMBR experiments, data analysis, writing. SY: Membrane preparation and characterization, data analysis. MB: Supervision, review and editing. NA: Supervision.

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Correspondence to S. Dhiman.

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Editorial responsibility: Samareh Mirkia.

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Dhiman, S., Yadav, S., Balakrishnan, M. et al. Fouling behaviour of industrial waste-based ceramic membrane in anaerobic membrane bioreactor treating low strength wastewater. Int. J. Environ. Sci. Technol. 21, 1369–1378 (2024). https://doi.org/10.1007/s13762-023-05070-w

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  • DOI: https://doi.org/10.1007/s13762-023-05070-w

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