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Updated: Dec 23, 2025

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
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Full-scale N removal from centrate using a sidestream process with a mainstream carbon source.

Angel Lacroix1, Casey Mentzer2, Krishna R Pagilla3

  • 1Truckee Meadows Water Authority, Reno, NV, USA.

Water Environment Research : a Research Publication of the Water Environment Federation
|April 23, 2020
PubMed
Summary

A novel sidestream nitrogen removal process at Truckee Meadows Water Reclamation Facility (TMWRF) significantly reduced ammonia and total nitrogen loads. This cost-effective solution optimized existing infrastructure, saving $1,500 daily on methanol costs.

Keywords:
centratecost-effective N removalnitrogen removalsidestream treatment

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Nitrogen Removal Processes

Background:

  • Centrate discharge poses challenges for nitrogen removal.
  • Wastewater reclamation facilities face stringent nitrogen load limits.
  • Aging infrastructure necessitates innovative treatment solutions.

Purpose of the Study:

  • Investigate an innovative approach for rapid nitrogen load reduction in centrate.
  • Apply and demonstrate a full-scale sidestream nitrogen removal process.
  • Evaluate the cost-effectiveness and operational feasibility of the new system.

Main Methods:

  • Re-purposed existing infrastructure for a suspended growth biological centrate treatment system.
  • Achieved simultaneous nitrification and denitrification.
  • Utilized primary effluent as an in-situ carbon source.

Main Results:

  • Attained average ammonia reduction of 81% and total nitrogen reduction of 53% in the sidestream.
  • Demonstrated significant nitrogen reduction in the mainstream facility.
  • Achieved daily methanol cost savings of $1,500.

Conclusions:

  • The sidestream nitrogen removal process is an effective, low-capital solution for reducing nitrogen loads.
  • Adaptive operations successfully managed alkalinity and carbon limitations.
  • The system provides a critical supplemental treatment for aging nitrogen facilities.