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Related Experiment Videos

Calcium effect on enhanced biological phosphorus removal.

R Barat1, T Montoya, L Borras

  • 1Dpto Ingeniería Hidráulica y Medio Ambiente, Universidad Politécnica de Valencia Camino de Vera s/n 46022 Valencia, Valencia, Spain. rababa@dihma.upv.es

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|August 8, 2006
PubMed
Summary

Calcium significantly impacts enhanced biological phosphorus removal (EBPR). High calcium levels lead to inert polyphosphate granules, potentially altering bacterial metabolism from phosphorus accumulation to glycogen accumulation.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Biotechnology

Background:

  • Enhanced biological phosphorus removal (EBPR) is crucial for wastewater treatment.
  • The influence of influent parameters on EBPR efficiency requires further investigation.
  • Calcium's role in microbial metabolic pathways during phosphorus removal is not fully understood.

Purpose of the Study:

  • To investigate the role of calcium (Ca) concentration in enhanced biological phosphorus removal (EBPR).
  • To explore the implications of Ca on the metabolic pathways of phosphorus-accumulating organisms (PAOs) and glycogen-accumulating organisms (GAOs).
  • To determine the relationship between Ca concentration and phosphorus yield (Y(PO4)) in an SBR system.

Main Methods:

  • An 8-month study was conducted using a sequencing batch reactor (SBR) under anaerobic-aerobic conditions.

Related Experiment Videos

  • Variations in influent calcium concentration were systematically applied.
  • Measurements included phosphorus removal efficiency, Y(PO4), pH, denitrification, and calcium phosphate formation. Microbiological analysis assessed PAO and GAO populations.

    • Main Results:

    • Influent Ca concentration significantly influenced the EBPR process and Y(PO4).
    • Y(PO4) was inversely dependent on Ca concentration, increasing as Ca decreased.
    • High Ca concentrations resulted in 'inert' polyphosphate granules, suggesting a shift in bacterial metabolism from polyphosphate-accumulating metabolism (PAM) to glycogen-accumulating metabolism (GAM) at high Ca levels, without significant changes in PAO/GAO populations.

    Conclusions:

    • Calcium concentration is a critical factor affecting EBPR efficiency and the metabolic fate of phosphorus.
    • High calcium levels can lead to the formation of non-reactive polyphosphate granules, hindering phosphorus removal.
    • The study suggests a metabolic shift influenced by Ca, favoring GAM over PAM under high Ca conditions.