Revealing the dissimilar structure of microbial communities in different WWTPs that treat fish-canning wastewater with different NaCl content

Studies that characterize the microbial communities in wastewater treatment plants (WWTPs) are numerous, yet similar studies industrial WWTPs treating fish-canning effluents limited. The samples of 4 operated under different NaCl concentrations were investigated by qPCR and partial 16S rRNA gene Illumina sequencing. absolute abundances key populations (Total Bacteria, Archaea Fungi, ammonium oxidizing bacteria (AOB), Mycolata, Candidatus Microthrix, Ca. Accumulibacter Competibacter) presented statistical differences among WWTPs. concentration negatively affected abundance Bacteria filamentous, phosphate (PAO) glycogen (GAO) accumulating bacteria, while AOB Microthrix statistically higher WWTP with contents. On other hand, main bacterial operational taxonomic units (OTUs) classified as members Kouleothrix (Chloroflexia, Chloroflexi) Tetrasphaera (Actinomycetia, Actinobacteria), family Beijerinckiaceae (Alphaproteobacteria, Proteobacteria), order Betaproteobacteriales (Gammaproteobacteria, Sphingobacteriales (Sphingobacteriia, Bacteroidetes) Frankiales (Actinobacteria, class Anaerolineae (Chloroflexi), phylum Chloroflexi Bacteria_unclassified. structure community was highly dissimilar WWTPs, identities dominant OTUs differed significantly them. Therefore, individual characteristics mainly concentration, responsible for narrow assemblage communities. Different belonging to phyla Actinobacteria, Bacteroidetes, Chloroflexi, Gemmatimonadetes Proteobacteria revealed salt-tolerant. Taking into account these results, content an important driver analysed facilities.