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Related Concept Videos

The Phosphorus Cycle01:21

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Prokaryotic cells possess a variety of inclusions that play crucial roles in nutrient storage, metabolic processes, and environmental adaptation. These structures enable bacteria to thrive under fluctuating environmental conditions by storing essential resources and optimizing their metabolic efficiency.Carbon Storage: Poly-β-Hydroxybutyric Acid and Glycogen GranulesBacteria frequently store excess carbon in specialized granules. Poly-β-hydroxybutyric acid (PHB) granules are lipid polymers that...
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Related Experiment Video

Updated: Jul 11, 2026

Assaying for Inorganic Polyphosphate in Bacteria
07:20

Assaying for Inorganic Polyphosphate in Bacteria

Published on: January 21, 2019

Phosphorus accumulation by bacteria isolated from a continuous-flow two-sludge system.

Lin-lin Bao1, Dong Li, Xiang-kun Li

  • 1School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. jialin01_01@126.com

Journal of Environmental Sciences (China)
|October 6, 2007
PubMed
Summary
This summary is machine-generated.

Researchers identified polyphosphate-accumulating organisms (PAOs) in a two-sludge system. Some PAOs efficiently accumulated phosphorus under both anoxic and aerobic conditions, with Alcaligenes and Pseudomonas showing strong capabilities.

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Area of Science:

  • Environmental microbiology
  • Biotechnology
  • Wastewater treatment

Background:

  • Polyphosphate-accumulating organisms (PAOs) are crucial for biological phosphorus removal in wastewater treatment.
  • Understanding the diversity and metabolic capabilities of PAOs is essential for optimizing treatment processes.
  • Lab-scale continuous-flow systems provide controlled environments for isolating and studying microbial communities.

Purpose of the Study:

  • To isolate and identify polyphosphate-accumulating organisms (PAOs) from a lab-scale continuous-flow two-sludge system.
  • To investigate the phosphorus accumulation characteristics of these isolates under anoxic and aerobic conditions.
  • To differentiate PAOs based on their electron acceptor utilization (oxygen vs. nitrate).

Main Methods:

  • Isolation and identification of PAOs from a two-sludge system.
  • Cultivation and characterization of isolates under varying anoxic and aerobic conditions.
  • Assessment of phosphorus uptake capabilities and electron acceptor preferences.

Main Results:

  • Two types of PAOs were identified: those using only oxygen and those using nitrate or oxygen as electron acceptors.
  • Five of eight isolates could utilize both nitrate and oxygen for phosphorus uptake.
  • Alcaligenes and Pseudomonas isolates demonstrated significant phosphorus accumulation under both anoxic and aerobic conditions.
  • Streptococcus showed poor anoxic accumulation but good aerobic accumulation.
  • Enterobacteriaceae exhibited excellent denitrification and aerobic phosphorus accumulation but limited anoxic uptake.

Conclusions:

  • The study identified diverse PAOs with varying phosphorus accumulation efficiencies and electron acceptor preferences.
  • Alcaligenes and Pseudomonas are promising candidates for enhanced biological phosphorus removal.
  • Understanding specific metabolic pathways, like denitrification, is key to optimizing PAO performance in wastewater treatment.