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The Extraction of Liver Glycogen Molecules for Glycogen Structure Determination
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Published on: February 8, 2022

Temperature effects on glycogen accumulating organisms.

Carlos M Lopez-Vazquez1, Christine M Hooijmans, Damir Brdjanovic

  • 1UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX Delft, The Netherlands; Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC Delft, The Netherlands. c.m.lopezvasquez@gmail.com

Water Research
|April 22, 2009
PubMed
Summary

Temperature significantly impacts glycogen accumulating organisms (GAO) and polyphosphate-accumulating organisms (PAO) in enhanced biological phosphorus removal (EBPR). Low temperatures favor PAO, while high temperatures limit GAO growth, offering strategies for wastewater treatment optimization.

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Biochemical Titration of Glycogen In vitro
07:16

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Published on: November 24, 2013

Area of Science:

  • Environmental microbiology
  • Wastewater treatment technologies
  • Biogeochemical cycles

Background:

  • Glycogen accumulating organisms (GAO) compete with polyphosphate-accumulating organisms (PAO), potentially disrupting enhanced biological phosphorus removal (EBPR).
  • Understanding temperature effects on GAO metabolism is crucial for optimizing EBPR systems.

Purpose of the Study:

  • To investigate the long-term effects of temperature on the anaerobic and aerobic stoichiometry and conversion rates of Competibacter, a known GAO.
  • To determine temperature dependencies for metabolic processes in GAO to improve activated sludge modeling.

Main Methods:

  • Enriched cultures of Competibacter were adapted and subjected to a temperature range of 10-40°C.
  • Stoichiometry and conversion rates were evaluated under both anaerobic and aerobic conditions.
  • Temperature coefficients for metabolic processes were derived.

Main Results:

  • Competibacter's anaerobic stoichiometry remained constant between 15-35°C, while aerobic stoichiometry was stable from 10-30°C.
  • At 10°C, a shift towards PAO (Accumulibacter) dominance was observed, indicating inhibition of GAO anaerobic pathways.
  • Higher temperatures (35-40°C) limited Competibacter growth due to inhibited aerobic processes.

Conclusions:

  • GAO metabolism prioritizes storage pool restoration over rapid growth, similar to PAO.
  • Adjusting aerobic solids retention time can suppress GAO proliferation in EBPR systems.
  • Operating EBPR reactors at low temperatures (e.g., 10°C) may promote enriched PAO cultures.