Microbial community succession and its correlation with reactor performance in a sponge membrane bioreactor coupled with fiber-bundle anoxic bio-filter for treating saline mariculture wastewater. (January 2020)

• Record Type: Journal Article
• Authors: Song, Weilong; Lee, Lai Yoke; You, Hong; Shi, Xueqing; Ng, How Yong
• Is Part Of: Bioresource technology. Volume 295(2020)
• Publication Date: 2020-01
• Subjects: Microbial community succession -- Membrane bioreactor -- Bio-carriers -- Saline wastewater -- Mariculture wastewater; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122284
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: High TN removal (93.2%) under high saline condition was achieved by FAF-SMBR. Seawater activated sludge dominated by abundant marine bacteria was acclimated. Carriers reconstructed polymeric structure of disintegrated sludge under saline stress. Nitrifiers and denitrifiers were enriched under high saline stress based on bio-carriers. Marine bacteria capable of degrading EPS and SMP were identified in bio-carriers. Abstract: The application of MBR in high saline wastewater treatment is mainly constrained by poor nitrogen removal and severe membrane fouling caused by high salinity stress. A novel carriers-enhanced MBR system was successfully developed for treating saline mariculture wastewater, which showed efficient TN removal (93.2%) and fouling control. High-throughput sequencing revealed the enhancement mechanism of bio-carriers under high saline condition. Bio-carriers substantially improved the community structure, representatively, nitrifiers abundance ( Nitrosomonas, Nitrospira ) increased from 2.18% to 9.57%, abundance of denitrifiers ( Sulfurimonas, Thermogutta, etc. ) also rose from 3.81% to 14.82%. Thereby, the nitrogen removal process was enhanced. Noteworthy, ammonia oxidizer ( Nitrosomonas, 8.26%) was the absolute dominant nitrifiers compared with nitrite oxidizer ( Nitrospira, 1.13%). This supported the finding of shortcut nitrification–denitrification process in hybrid system. Moreover, a series of biomacromolecule degraders ( Lutibacterium, Cycloclasticus, etc. ) were detected in bio-carriers, which could account for the mitigation of membrane fouling as result of EPS and SMP degradation.