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Article

Untapped Potential of Moving Bed Biofilm Reactors with Different Biocarrier Types for Bilge Water Treatment: A Laboratory-Scale Study

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Department of Chemical Engineering, Cyprus University of Technology, Anexartisias 57 Str., Lemesos 3036, Cyprus
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Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Kitiou Kyprianou 45, Lemesos 3041, Cyprus
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Research Unit for Nanostructured Materials Systems, Cyprus University of Technology, Kitiou Kyprianou 36, Lemesos 3041, Cyprus
*
Author to whom correspondence should be addressed.
Academic Editors: Eric D. van Hullebusch and Anas Ghadouani
Water 2021, 13(13), 1810; https://doi.org/10.3390/w13131810
Received: 30 April 2021 / Revised: 8 June 2021 / Accepted: 28 June 2021 / Published: 29 June 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
Two labscale aerobic moving bed biofilm reactor (MBBR) systems, with a different type of biocarrier in each (K3 and Mutag BioChip), were operated in parallel for the treatment of real saline bilge water. During the operation, different stress conditions were applied in order to evaluate the performance of the systems: organic/hydraulic load shock (chemical oxygen demand (COD): 9 g L−1; hydraulic retention time (HRT): 48–72 h) and salinity shock (salinity: 40 ppt). At the same time, the microbiome in the biofilm and suspended biomass was monitored through 16S rRNA gene analysis in order to describe the changes in the microbial community. The dominant classes were Alphaproteobacteria (families Rhodospirillaceae and Rhodobacteraceae) and Bacteroidia (family Lentimicrobiaceae), being recorded at high relative abundance in all MBBRs. The structure of the biofilm was examined and visualized with scanning electron microscopy (SEM) analysis. Both systems exhibited competent performance, reaching up to 86% removal of COD under high organic loading conditions (COD: 9 g L−1). In the system in which K3 biocarriers were used, the attached and suspended biomass demonstrated a similar trend regarding the changes observed in the microbial communities. In the bioreactor filled with K3 biocarriers, higher concentration of biomass was observed. Biofilm developed on Mutag BioChip biocarriers presented lower biodiversity, while the few species identified in the raw wastewater were not dominant in the bioreactors. Through energy-dispersive X-ray (EDX) analysis of the biofilm, the presence of calcium carbonate was discovered, indicating that biomineralization occurred. View Full-Text
Keywords: oily wastewater; biological treatment; next-generation sequencing; biofilm; bacteria oily wastewater; biological treatment; next-generation sequencing; biofilm; bacteria
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MDPI and ACS Style

Mazioti, A.A.; Koutsokeras, L.E.; Constantinides, G.; Vyrides, I. Untapped Potential of Moving Bed Biofilm Reactors with Different Biocarrier Types for Bilge Water Treatment: A Laboratory-Scale Study. Water 2021, 13, 1810. https://doi.org/10.3390/w13131810

AMA Style

Mazioti AA, Koutsokeras LE, Constantinides G, Vyrides I. Untapped Potential of Moving Bed Biofilm Reactors with Different Biocarrier Types for Bilge Water Treatment: A Laboratory-Scale Study. Water. 2021; 13(13):1810. https://doi.org/10.3390/w13131810

Chicago/Turabian Style

Mazioti, Aikaterini A., Loukas E. Koutsokeras, Georgios Constantinides, and Ioannis Vyrides. 2021. "Untapped Potential of Moving Bed Biofilm Reactors with Different Biocarrier Types for Bilge Water Treatment: A Laboratory-Scale Study" Water 13, no. 13: 1810. https://doi.org/10.3390/w13131810

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