Full-scale N removal from centrate using a sidestream process with a mainstream carbon source

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.