Abstract
Bulking and foaming are extreme filamentous bacterial growths that present serious challenges for the biological leachate treatment process. The current study evaluates the performance of long-term full-scale membrane bioreactor (MBR) treating landfill leachate, specifically focusing on filamentous bacteria overgrowth in the bioreactors. The influence of the variation in leachate structure and operational conditions on floc morphology and filamentous bacteria overgrowth were analyzed for 11 months of operation of the full-scale MBR system. The average chemical oxygen demand (COD) and NH4-N removal efficiencies of the system were 87.8 ± 4% and 99.5 ± 0.7%. However, incomplete denitrification was observed when the F/M ratio was low. The high C/N ratio was observed to enhance the frequency of small flocs. Furthermore, a poor to medium diversity of the microbial community was observed. Haliscomenobacter hydrossis, Microthrix parvicella, and Type 021N were found as the most numerous filamentous organisms. Paramecium spp., Euplotes spp., and Aspidisca spp. were found in small quantities. The limited concentration of PO4-P in the leachate compared to high COD and NH4-N concentrations most probably caused phosphate deprivation and increased abundance of identified filamentous microorganisms. This work is the first study in Türkiye that investigates the bulking and foaming problem in full-scale MBR that treats landfill leachate. Hence, it may provide some pioneering perspectives into landfill leachate remediation by monitoring the hybrid biological system.
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The data that support the findings of this study are available on request from the corresponding author.
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Acknowledgements
The authors would like to acknowledge ISTAC Inc. (Istanbul Environment Management of Industry and Trade Company) for their technical support during the sampling stage.
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Bahar Yavuzturk Gul: writing — original draft, writing — review and editing, methodology, conceptualization, data curation, formal analysis. Hazal Gulhan: writing — original draft, methodology, data curation. Suleyman Soyel: writing — original draft, investigation, data curation. Recep Kaya: writing — review and editing, investigation, data curation. Mustafa Evren Ersahin: writing — review and editing, investigation. Suleyman Ovez: writing — review and editing, resources — study materials, investigation. Ismail Koyuncu: conceptualization, supervision, project administration.
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Yavuzturk Gul, B., Gulhan, H., Soyel, S. et al. Landfill leachate treatment with a full-scale membrane bioreactor: impact of leachate characteristics on filamentous bacteria. Environ Sci Pollut Res 30, 91874–91886 (2023). https://doi.org/10.1007/s11356-023-28227-z
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DOI: https://doi.org/10.1007/s11356-023-28227-z