DO/Nmaster™ improves water quality and saves up to 60 percent of energy costs

DO/Nmaster™ is a software program that maintains constant ammonia or dissolved oxygen concentration (DO) by matching oxygen demand with oxygen supply in real time. It does this by controlling blower/compressor output and airflows or pure oxygen flows to each part of an aeration basin. Its sophisticated control algorithm prevents valve and blower “hunting”; it also notifies operators about unusual patterns in oxygen demand and about DO and ammonia meters and actuators problems.

Unique Features of DOmaster™ Software

• Control algorithms are based on self-calibrated on-line aerodynamics models, DO and ammonia models. 
• Blower control is based on flow demand and valve positions rather than on pressure.
• Sensor and actuator fault detection algorithms prevent the use of faulty data and automatically switch the system to “fail-safe” control.
• The controller automatically notifies operators about potential problems and suggests possible solutions using fuzzy logic methodology combined with non-parametric statistics.

Domaster™ History

2002: The California Energy Commission selects, from a field of 70 applicants, Ekster and Associates, Inc.’s proposal to develop universal DO control software.

2003: DOmaster™ is developed.

2004: DOmaster™ is installed at the 32 MGD Oxnard wastewater treatment plant and is documented to provide a 15 percent energy savings.

2018: DO/Nmaster was installed at 12MGD Chico wastewater treatment plant where it saved 60% of energy, eliminated valves and blowers "hunting" and significantly improved nutrient removal.

FAQs
WHITE PAPER

• Save energy.
  Energy savings can be forecasted using Ekster and Associates, Inc.’s methodology. Contact us for details.

• Provide DO control without valve and blower “hunting.”

• Always inform operators about potential problems related to aeration and suggest possible solutions.