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Ammonia Synthesis at Low Pressure
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Expanding DEMON Sidestream Deammonification Technology Towards Mainstream Application.

B Wett1, S M Podmirseg, M Gómez-Brandón

  • 1ARAconsult, A-6020 Innsbruck, Austria.

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|December 15, 2015
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Summary
This summary is machine-generated.

This study explored mainstream deammonification for municipal wastewater treatment at ambient temperatures. Researchers successfully enriched anammox bacteria in the mainstream, achieving stable nitrogen removal and high ammonia reduction.

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment Technologies

Background:

  • Conventional wastewater treatment struggles with energy efficiency and nitrogen removal.
  • Deammonification, utilizing partial nitritation/anammox (ANA), offers a promising alternative for energy-efficient nitrogen removal.
  • Implementing ANA in the mainstream of municipal wastewater treatment plants (WWTPs) at ambient temperatures presents significant challenges.

Purpose of the Study:

  • To investigate the feasibility of mainstream deammonification for full-plant municipal wastewater treatment at ambient temperatures.
  • To evaluate the effectiveness of bioaugmentation and hydrocyclone implementation for promoting anammox bacteria in the mainstream.
  • To achieve stable nitrogen removal and high ammonia removal efficiency in a full-scale WWTP.

Main Methods:

  • Cross-Atlantic R&D cooperation involving three large utilities.
  • Bioaugmentation with aerobic and anaerobic ammonia oxidizers (AOB and AMX) from a sidestream process.
  • Implementation of hydrocyclones for anammox granule selection and retention.
  • Laboratory, pilot-scale, and full-scale (Strass WWTP) testing with various operation modes.

Main Results:

  • Stable repression of nitrite oxidizing biomass (NOB) achieved for several months at full-scale.
  • Significant anammox enrichment observed in the mainstream process.
  • High efficiency maintained in the sidestream process, with a 96% annual average ammonia removal.
  • Successful promotion of the shortcut anammox route in nitrogen removal metabolism.

Conclusions:

  • Mainstream deammonification is feasible for full-plant municipal wastewater treatment at ambient temperatures.
  • Bioaugmentation and hydrocyclone implementation are effective strategies for enriching anammox bacteria in the mainstream.
  • The study demonstrates a viable approach for enhancing nitrogen removal efficiency and potentially reducing operational costs in WWTPs.