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Related Experiment Video

Updated: Feb 14, 2026

The Microfluidic Probe: Operation and Use for Localized Surface Processing

The Microfluidic Probe: Operation and Use for Localized Surface Processing

Published on: June 4, 2009

Centrate Pretreatment Process (CPT) Sidestream Deammonification Startup--Operational Challenge.

¹Alexandria Renew Enterprises, 1800 Limerick Street, Alexandria, VA 22314, USA.

Water Environment Research : a Research Publication of the Water Environment Federation

|February 14, 2018

Summary

Alexandria Renew Enterprises (AlexRenew) implemented a centrate pretreatment (CPT) system using sidestream deammonification. Despite initial challenges, the system achieved full operational capacity and high nitrogen removal rates.

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Area of Science:

Environmental Engineering
Wastewater Treatment
Nitrogen Removal

Background:

Alexandria Renew Enterprises (AlexRenew) operates an advanced resource recovery facility.
Centrate from sludge dewatering contains high nitrogen concentrations.
Effective nitrogen removal is crucial for wastewater treatment plants.

Purpose of the Study:

To summarize operational challenges during the startup of a centrate pretreatment (CPT) system.
To document the approaches and learnings for addressing these challenges.
To provide insights for future improvements in deammonification processes.

Main Methods:

Startup of a centrate pretreatment (CPT) system utilizing the sidestream deammonification process (DEMON®).
Monitoring of operational parameters including ammonia and total nitrogen removal rates.
Identification and resolution of operational issues such as centrate quality and nutrient deficiencies.

Main Results:

During startup, average ammonia and total nitrogen removal rates were 89% and 78%, respectively.
Operational issues encountered included centrate quality, nitrite control, and nutrient deficiencies.
The CPT system achieved 100% plant centrate production (0.5 kg N/m3/d) after 18 months.

Conclusions:

The CPT system startup faced significant operational hurdles.
Problem-solving focused on operational and process control measures.
The system successfully reached full capacity, demonstrating the viability of sidestream deammonification for nitrogen removal.