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Article Abstract
Types of microbial aggregates have essential effects on bacterial communities' characteristics, thus affecting the pollutants removal. An up-flow biofilm reactor was used to study the different performances of S/NO removal and functional genes in suspended sludge and biofilms. The metabolic pathways of sulfurous and nitrogenous pollutants in the desulfurization-denitrification process were proposed. The results showed that S formation dominated the reactor with a high S concentration. Autotrophic Sulfurovum responsible for S/S oxidation was the only dominant bacteria in suspended sludge. Heterotrophic Desulfocapsa responsible for SO reduction coexisted with Sulfurovum and dominated in biofilms. S oxidation to S was catalyzed via fccA/B and sqr genes in suspended sludge. S/S oxidation to SO was catalyzed via dsrA/B gene in biofilms. SO and NO were removed via the dissimilatory sulfate reduction and denitrification pathway, respectively. This work provides a fundamental and practical basis for optimizing suspended sludge/biofilm systems for S/NO removal.
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| http://dx.doi.org/10.1016/j.biortech.2021.126108 | DOI Listing |
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