Abstract
Wastewater treatment plants (WWTPs) are necessary to protect ecosystems quality and human health. Their function relies on the degradation of organic matter and nutrients from a water influent, prior to the effluent release into the environment. In this work we studied the bacterial community dynamics of a municipal WWTP with a membrane bioreactor through 16S rRNA gene sequencing. The main phyla identified in the wastewater were Proteobacteria, Bacteroidetes, Chloroflexi, Planctomycetes and Actinobacteria. The WWTP is located in Spain and, like other studied WWTP in temperate climate zones, the temperature played a major role in community assembly. Seasonal community succession is observed along the two years sampling period, in addition to a continual annual drift in the microbial populations. The core community of the WWTP bioreactor was also studied, where a small fraction of sequence variants constituted a large fraction of the total abundance. This core microbiome stability along the sampling period and the likewise dissimilarity patterns along the temperature gradient makes this feature a good candidate for a new process control in WWTPs.
Highlights
Wastewater treatment plants (WWTPs) are necessary to protect ecosystems quality and human health
The average relative abundances, of sequence reads for the main phyla in all stages were as follows: Proteobacteria 30.18% ± 3.84%, Bacteroidetes 23.12% ± 5.12%, Chloroflexi 17.15% ± 3.55%, Planctomycetes 7.53% ± 2.10%, Actinobacteria 7.20% ± 3.25%, Acidobacteria 5.63% ± 1.52%, Patescibacteria 1.74% ± 1.17%, Firmicutes 1.66% ± 1.11%, Verrucomicrobia 1.25% ± 0.44%, Nitrospirae 0.51% ± 0.54%
We studied the bacterial community dynamics of a municipal waste water treatment plant with a membrane bioreactor (MBR-Wastewater Treatment Plants (WWTPs))
Summary
Wastewater treatment plants (WWTPs) are necessary to protect ecosystems quality and human health. The core community of the WWTP bioreactor was studied, where a small fraction of sequence variants constituted a large fraction of the total abundance This core microbiome stability along the sampling period and the likewise dissimilarity patterns along the temperature gradient makes this feature a good candidate for a new process control in WWTPs. Contaminant removal from industrial and urban wastewater is a capital issue for the protection of the natural environment and human health. In the activated sludge microbial community, seasonal dynamics may affect the performance and stability of organic material and nutrient removal (nitrogen and phosphorus) in WWTPs8,20 This aspect should be studied in more detail with the aim of using tag-sequencing as routine technology as a means of learning about microbial ecology in WWTPs. it is necessary to understand the dynamics of microbial communities and their seasonal variations for predicting undesirable changes in the functional diversity of activated sludges, for a better control over operational parameters of WWTPs
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