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JOURNAL ARTICLE

Nitrifying biomass characterization and monitoring during bioaugmentation in a membrane bioreactor

Sibilla D'Anteo, Alberto Mannucci, Matteo Meliani, Franco Verni, Giulio Petroni, Giulio Munz, Claudio Lubello, Gualtiero Mori, Claudia Vannini
Environmental Technology 2015, 36 (24): 3159-66
26017932
A membrane bioreactor (MBR), fed with domestic wastewater, was bioaugmented with nitrifying biomass selected in a side-stream MBR fed with a synthetic high nitrogen-loaded influent. Microbial communities evolution was monitored and comparatively analysed through an extensive bio-molecular investigation (16S rRNA gene library construction and terminal-restriction fragment length polymorphism techniques) followed by statistical analyses. As expected, a highly specialized nitrifying biomass was selected in the side-stream reactor fed with high-strength ammonia synthetic wastewater. The bioaugmentation process caused an increase of nitrifying bacteria of the genera Nitrosomonas (up to more than 30%) and Nitrobacter in the inoculated MBR reactor. The overall structure of the microbial community changed in the mainstream MBR as a result of bioaugmentation. The effect of bioaugmentation in the shift of the microbial community was also verified through statistical analysis.

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