How Leading Utilities Are Reducing Risk and Improving Reliability: A Five-Step Approach to BNR Success

Biological nutrient removal (BNR) performance depends on far more than selecting the right supplemental carbon source. Long-term compliance is achieved through a combination of process understanding, reliable equipment, responsive monitoring, and ongoing optimization. As nutrient limits become more stringent and operational resources remain constrained, many facilities are looking for approaches that improve treatment performance while reducing risk, supporting sustainability goals, and delivering predictable operating costs.

At EOSi, our approach to BNR is built around a complete solution strategy. From startup and implementation through ongoing optimization, we work alongside facility staff to help ensure carbon addition programs remain efficient, reliable, and adaptable to changing plant conditions.

Step 1: Evaluate the Process and Define Objectives

Every treatment plant is different. Influent characteristics, treatment processes, permit requirements, seasonal loading, and operational goals all influence carbon dosing requirements.

Before implementation, EOSi works with facilities to evaluate process conditions and identify opportunities to maximize nutrient removal performance efficiency and support broader sustainability initiatives. This process-driven approach helps establish the foundation for long-term success rather than simply replacing one carbon source with another.

Step 2: Implement Sustainable, Reliable Carbon Addition

For many facilities, sustainability and operational safety have become important considerations alongside treatment performance. Facilities transitioning from hazardous carbon sources such as methanol often seek alternatives that reduce storage and handling concerns while maintaining compliance.

Across multiple EOSi evaluations, facilities have successfully transitioned from methanol to MicroC® while maintaining compliance and reducing operational risk. At a South Florida water reclamation facility utilizing Tetra denitrification filters, operators replaced methanol with nonhazardous MicroC 2000, maintained effluent total nitrogen performance, and reduced supplemental carbon consumption by up to 26% when paired with Nitrack® automation.

Similarly, a Washington State wastewater treatment plant operating a 4-stage Bardenpho process converted from methanol to MicroC®, consistently achieved its 3 mg/L NOx permit target, eliminated the need for off-season maintenance dosing, and ultimately avoided costly upgrades associated with methanol storage and feed infrastructure.

Consistent product quality, backed by dependable logistics and advanced automation, help facilities avoid interruptions that can put compliance at risk.

Step 3: Optimize Dosing Through Intelligent Control

Carbon optimization requires more than flow-paced dosing alone. Process conditions can change rapidly due to fluctuations in loading, flow, temperature, and biological activity.

EOSi's Nitrack® platform continuously monitors treatment conditions and adjusts dosing strategies to match actual process needs. By combining feedforward and feedback control logic, Nitrack helps facilities maintain treatment performance while minimizing excess carbon use. Real-time monitoring, automated alarming, and performance tracking provide operators with visibility into system conditions before minor issues become process upsets.

The result is reduced operational risk, minimized downtime, and increased confidence that nutrient removal objectives are being achieved as efficiently as possible.

Step 4: Standardize Delivery and Monitoring Infrastructure

Reliable BNR performance depends on consistent chemical delivery and real-time process visibility. EOSi's NitraSkid-IQ™ platform provides a centralized solution for integrating carbon feed systems with Nitrack® monitoring and control technology, allowing facilities to automate dosing, track system performance, and respond quickly to changing process conditions.

Through Nitrack's continuous monitoring, alarming, and performance tracking capabilities, operators gain greater visibility into dosing activity and system health, helping identify abnormal conditions before they become process upsets. Integrated inventory management through MicroC-IM further supports operational planning by monitoring chemical usage, tracking inventory levels, and facilitating timely product replenishment.

Together with EOSi's dependable product quality and supply chain support, these tools help facilities reduce operational risk, minimize downtime, and maintain consistent treatment performance while reducing the burden on plant personnel.

Step 5: Maintain Performance Through Ongoing Partnership

BNR optimization is not a one-time effort. Process conditions evolve as facilities expand, influent characteristics change, and permit requirements become more stringent.

A key component of the EOSi approach is ongoing technical support from experienced process specialists. From system startup and commissioning through long-term optimization, facilities have access to process expertise focused on maintaining stable operation and identifying opportunities for further improvement.

This partnership approach has helped wastewater treatment facilities across a variety of treatment configurations maintain compliance, improve operational efficiency, and adapt to changing treatment demands over time.

A Complete Approach to Long-Term Compliance

Successful BNR programs are built on more than chemistry alone. They require reliable products, intelligent monitoring, proven infrastructure, and ongoing technical support working together as a complete strategy.

By combining sustainable carbon solutions, advanced control platforms, integrated monitoring tools, and process expertise, facilities can reduce operational risk, strengthen resilience, and position themselves for long-term compliance in an increasingly demanding regulatory environment.