Comparison of microbial and physicochemical behavior of expanded granular sludge bed system during methylparaben and triclosan removalWater Science & Technology
Artículo de revista
2019
IWA Publishing
Methylparaben and triclosan are antimicrobial agents widely used as preservatives in a variety of
personal care and pharmaceutical products. Wastewater is considered the main source of these
compounds in the environment. Expanded granular sludge bed (EGSB) reactors are a high rate
technology for wastewater treatment based on biological processes and have been shown to be
efficient in removing different types of compounds; however, little is known about the effect of
contaminants such as methylparaben and triclosan on their behavior and effectiveness. In this study,
we evaluate and compare the microbial and physicochemical behavior of EGSB systems during
methylparaben and triclosan removal. The presence of different concentrations of pollutants had an
influence on the cluster organization of microbial communities, especially bacteria. However, this did
not affect the stability and performance of the EGSB systems. The banding patterns of the denaturing
gradient gel electrophoresis of archaea demonstrated the constant presence and abundance of
Methanosaeta concilii throughout all stages of operation, showing that this microorganism played a
fundamental role in the stability of the reactors for the production of methane. The type of
compound and its concentration influenced the expression of the mcrA and ACAs genes; however,
these changes did not alter the stability and performance of the EGSB systems
Key words | anaerobic digestion, emerging pollutants, microbial communities, water treatment
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Tamaño: 539.1Kb
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