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Coupled virus - bacteria interactions and ecosystem function in an engineered microbial system.

M R Brown1, J C Baptista1, M Lunn2

  • 1School of Engineering, Newcastle University, NE1 7RU, UK.

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|January 26, 2019
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Summary
This summary is machine-generated.

Viruses significantly impact activated sludge systems, influencing bacterial populations and effluent quality. Monitoring virus abundance can help maintain wastewater treatment plant stability and function.

Keywords:
Activated sludgeVirusesWastewater treatment

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Area of Science:

  • Environmental Microbiology
  • Wastewater Engineering
  • Virology

Background:

  • Viruses are known to regulate bacterial dynamics in natural ecosystems.
  • Their role in engineered systems, like wastewater treatment plants, is less understood, especially over extended periods.

Purpose of the Study:

  • To investigate virus dynamics in a full-scale activated sludge plant over two years.
  • To determine the association between virus abundance and bacterial communities, system function, and operational parameters.

Main Methods:

  • Weekly measurements of virus abundance over two years.
  • Monitoring of total bacteria, ammonia-oxidizing bacteria (AOB), bacterial community profiles, and environmental parameters (e.g., COD, NH4+-N, pH).
  • Statistical analysis to identify associations between variables.

Main Results:

  • Virus abundance varied significantly (3.18 × 10^8 to 3.41 × 10^9 viruses/mL).
  • Virus abundance correlated with total bacterial and AOB counts, community composition, and effluent quality (COD, NH4+-N).
  • Associations were observed between viral dynamics and abiotic factors like pH.

Conclusions:

  • Viruses play a crucial role in the stability and function of activated sludge systems.
  • Viral dynamics are linked to bacterial abundance, community structure, and effluent quality, potentially impacting wastewater treatment performance.
  • Regular virus quantification is a simple, cost-effective tool for practitioners to monitor system health.