OPTImaster™ automatically selects DO and SRT targets, solves operational problems, and achieves energy savings of up to 25 percent

OPTImaster™ is a software program, which provides daily recommendations for sludge age (SRT), mixed liquor total suspended solids (MLSS) concentration, and dissolved oxygen (DO) concentration targets or set points. OPTImaster™ selects set points based on the activated sludge model and past plant performance; these set points minimize energy usage while maintaining the required effluent quality and reliability of operation.

Unique Features of OPTImaster™ Software

  • Set points are recommended daily.
  • Set point selection algorithms are based on the activated sludge model and past plant history.
  • The data mining algorithm combined with the iteration technique provides the ability to continuously improve plant performance.

OPTImaster™ History

2004: California Energy Commission selects, from a field of 68 applicants, Ekster and Associates Inc.’s proposal to develop DO and sludge age optimization software.

2005: OPTImaster™ is developed.

2006: OPTImaster™ is installed at the 32 MGD Oxnard wastewater treatment plant and, used in conjunction with DOmaster™, is documented to provide a 25 percent energy savings.



  • OPTImaster™ will save energy.

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

  • OPTImaster™ will improve reliability of operations.

  • OPTImaster™ will always inform operators about new trends in effluent quality, sludge settling, and energy demand.

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