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Nitrification utilizing CaCO3 as the buffering agent.

M Green1, Y Ruskol, S Tarre

  • 1Faculty of Agricultural Engineering, Technion, Haifa, Israel.

Environmental Technology
|May 10, 2002
PubMed
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This study explored using chalk (calcium carbonate) as a buffer in nitrification reactors. A single reactor where chalk served as both buffer and biomass carrier achieved high ammonium removal without external buffers.

Area of Science:

  • Environmental Microbiology
  • Biochemical Engineering
  • Water Treatment Technologies

Background:

  • Nitrification is crucial for wastewater treatment, converting ammonia to nitrate.
  • Buffering agents are typically required to maintain optimal pH for nitrifying bacteria.
  • Chalk (calcium carbonate) offers a potential low-cost buffering solution.

Purpose of the Study:

  • To investigate nitrification efficiency using chalk as a buffering agent.
  • To evaluate the impact of different fluidized bed reactor configurations on nitrification and chalk dissolution.
  • To determine the feasibility of operating nitrification systems without external buffer addition.

Main Methods:

  • Three fluidized bed reactor configurations were tested.
  • Zeolite and chalk particles were used as biomass carriers and/or buffering agents.

Related Experiment Videos

  • Ammonium removal rates and pH were monitored across systems.

    • Main Results:

    • A single reactor with chalk as both buffer and biomass carrier operated effectively without external buffer (NaHCO3).
    • This system achieved high ammonium removal rates (up to 2.5 g N l(-1) reactor d(-1)).
    • Efficient nitrification occurred even at a bulk solution pH as low as 5.5.

    Conclusions:

    • Chalk can effectively buffer nitrification processes when used as both biomass carrier and buffer.
    • A favorable microenvironment on the chalk surface likely facilitated nitrification at low bulk pH.
    • This approach offers a promising strategy for cost-effective nitrogen removal in wastewater treatment.