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Solved upscaling problems for implementing deammonification of rejection water.

B Wett1

  • 1Institute of 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
|August 8, 2006
PubMed
Summary

This study demonstrates the successful, full-scale implementation of rejection water deammonification using the DEMON system. The process significantly reduced energy consumption for nitrogen removal in wastewater treatment.

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Area of Science:

  • Environmental Microbiology
  • Wastewater Engineering
  • Biotechnology

Background:

  • Autotrophic nitrogen removal pathways are efficient but underutilized in practice.
  • Wastewater treatment plants face challenges in effective nitrogen removal and energy efficiency.

Purpose of the Study:

  • To report the successful implementation and performance of a full-scale rejection water deammonification system.
  • To evaluate the energy savings and nitrogen removal capacity of the DEMON system.

Main Methods:

  • Accumulation of anaerobic ammonia oxidizing biomass over a 2.5-year scale-up period.
  • Operation of a pH-controlled deammonification (DEMON) system at the WWTP Strass, Austria.
  • Monitoring of nitrogen removal rates and specific compressed air demand.

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Main Results:

  • The DEMON system achieved a nitrogen elimination capacity of approximately 300 kg per day.
  • Specific compressed air demand decreased significantly from 109 m3(kg N)(-1) to 29 m3(kg N)(-1), exceeding energy saving expectations.
  • Autotrophic metabolism dominance was confirmed by organic effluent loads exceeding influent loads.

Conclusions:

  • Full-scale rejection water deammonification is a viable and highly energy-efficient method for nitrogen removal.
  • The DEMON system offers substantial operational benefits and energy savings in wastewater treatment.
  • Successful implementation relies on gradual reactor scaling and controlled biomass accumulation.