Microbial communities from two field-scale @entity1707 wastewater treatment plants (WWTPs) were assessed by pyrosequencing analyses of bacterial and archaeal 16S ribosomal DNA (rDNA) fragments. Effluent samples from secondary (anaerobic covered lagoons and upflow anaerobic sludge blanket [UASB]) and tertiary treatment systems (open-pond natural attenuation lagoon and air-sparged nitrification-denitrification tank followed by alkaline @entity3151 precipitation process) were analyzed. A total of 56,807 and 48,859 high-quality reads were obtained from bacterial and archaeal libraries, respectively. Dominant bacterial communities were associated with the phylum Firmicutes, Bacteroidetes, Proteobacteria, or Actinobacteria. Bacteria and archaea diversity were highest in UASB effluent sample. @entity526 , Lactobacillus, Bacteroides, and/or Prevotella were used as indicators of putative pathogen reduction throughout the WWTPs. Satisfactory pathogen reduction was observed after the open-pond natural attenuation lagoon but not after the air-sparged nitrification/denitrification followed by alkaline @entity3151 precipitation treatment processes. Among the archaeal communities, 80  % of the reads was related to hydrogeno-trophic methanogens Methanospirillum. Enrichment of hydrogenotrophic methanogens detected in effluent samples from the anaerobic covered lagoons and UASB suggested that @entity515 reduction with H2 was the dominant methanogenic pathway in these systems. Overall, the results served to improve our current understanding of major microbial communities' changes downgradient from the pen and throughout @entity1707 WWTP as a result of different treatment processes.

Assessment of Bacterial and Archaeal Community Structure in XXXX Wastewater Treatment Processes.

@entity3151 :: ('MESH:D010758', 'Chemical') :: ['phosphorus'] @entity1707 :: ('9823', 'Species') :: ['swine'] @entity526 :: ('562', 'Species') :: ['Escherichia'] @entity515 :: ('CHEBI:29334', 'Chemical') :: ['CO2']
@entity1707 :: (9823,Species) :: ['Swine']
