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Related Concept Videos

Microbial Classification System01:24

Microbial Classification System

1
Classification is the process of organizing organisms into hierarchically inclusive groups based on their phenotypic similarities or evolutionary relationships. A species comprises one or more strains, and closely related species are grouped into genera. Genera are further classified into families, families into orders, orders into classes, and so forth, up to the domain level, which is the broadest taxonomic rank derived from a combination of phenotypic and genotypic data.The nomenclature of...
1

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Broad Microbial Community Functions in a Conventional Activated Sludge System Exhibit Temporal Stability.

Stephanie L Rich1, Damian E Helbling1

  • 1School of Civil and Environmental Engineering, Cornell University, Ithaca, New York 14850, United States.

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Wastewater microbial communities in activated sludge systems remove over 50% of influent chemicals. Key biotransformations like dehydrogenations show remarkable daily stability, unlike micropollutant removal.

Keywords:
biotransformationscheminformaticsdehydrogenationmass spectrometrymetabolomicsmicrobial processesnontarget screeningwastewater treatment

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Area of Science:

  • Environmental microbiology
  • Wastewater treatment
  • Metabolomics

Background:

  • Conventional activated sludge (CAS) systems host diverse microbial communities capable of numerous biotransformations.
  • The functional importance, frequency, and temporal stability of these biotransformations in CAS systems are not well understood.

Purpose of the Study:

  • To investigate the biotransformation capabilities and temporal stability of microbial communities in CAS systems.
  • To identify core chemical features and frequently occurring biotransformations within wastewater treatment processes.

Main Methods:

  • Collected 24-hour composite influent and effluent samples from a CAS system over 14 days.
  • Utilized high-resolution mass spectrometry (HRMS) for nontarget chemical feature analysis.
  • Quantified the occurrence and temporal stability of specific biotransformations based on detected chemical features.

Main Results:

  • Over 50% of influent chemical features were completely removed during treatment.
  • 352 core chemical features were consistently detected in both influent and effluent.
  • Nine biotransformations, including dehydrogenations, hydroxylations, and acetylations, occurred frequently (over 80 times/day) with high temporal stability (CV 0.13-0.20).

Conclusions:

  • Wastewater microbial communities in CAS systems exhibit robust and temporally stable biotransformation functions.
  • The stability of core biotransformations contrasts with the variability of micropollutant removal, suggesting specialized microbial roles.
  • This study provides a quantitative understanding of microbial functions in wastewater treatment, highlighting their stability and potential for process optimization.