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Development and implementation of a robust deammonification process.

B Wett1

  • 1Institute of Infrastructure/Environmental Engineering, University of Innsbruck, Technikerstr.13, A-6020 Innsbruck, Austria. bernhard.wett@uibk.ac.at

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 24, 2007
PubMed
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The DEMON process for deammonification significantly cuts energy use in wastewater treatment, achieving over 90% ammonia removal. This resource-saving technology is approaching the state of the art in nitrogen metabolism.

Area of Science:

  • Environmental Engineering
  • Microbiology

Background:

  • Deammonification is a two-step nitrogen metabolism shortcut.
  • Wastewater treatment plants (WWTPs) face challenges in energy efficiency and nitrogen removal.

Purpose of the Study:

  • To evaluate the performance and energy efficiency of the pH-controlled DEMON process for deammonification.
  • To assess if this resource-saving technology has reached the state of the art in full-scale operation.

Main Methods:

  • Implementation of a single-sludge SBR system using the DEMON process for reject water treatment.
  • Monitoring ammonia removal rates and specific energy demand over nearly three years of operation.

Main Results:

  • The DEMON process achieved annual ammonia removal rates exceeding 90%.

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  • Specific energy demand was significantly lower (1.16 kWh/kg N removed) compared to mainstream treatment (6.5 kWh/kg N removed).
  • Full-scale operation demonstrated sustained performance over almost three years.

    • Conclusions:

    • The pH-controlled DEMON process is a highly effective and energy-efficient method for deammonification.
    • The technology has demonstrated its capability to approach state-of-the-art performance in full-scale wastewater treatment.
    • Successful implementation can lead to energy self-sufficiency in WWTPs.