Sacramento Regional Wastewater Treatment Plant

Jun 14, 2019
Mitch Maidrand

What are your facility’s drivers/needs?

  • Meeting more stringent permit requirements on coliform, ammonia, and nitrate.
  • Transitioning from a secondary water resource recovery facility to tertiary in order to produce a much higher quality of effluent.

What new technologies have you been evaluating or implementing?

  • Biological Nutrient Removal (BNR) for ammonia and nitrate reduction, granular filtration, and enhanced disinfection to meet Title 22 requirements.
    Sacramento Regional Wastewater Treatment Plant
  • An $18 million pilot was constructed and operated at the Sacramento Regional Wastewater Treatment plant (SRWTP) for two years. The most promising technologies were selected by a committee of experts through a well-vetted process (i.e., BNR, filtration, and chlorine for disinfection). 
  • The studies for cost-effective technologies began in 2011 and the pilot plant was built in 2012. The pilot demonstrated that the technologies selected for full-scale met the permit limits. It also gave us important information that has been used in the design of the upgrade.
  • Based on the pilot results, the treatment plant is currently undergoing a $1.75 billion upgrade.


What technologies are you interested in investigating?

  • We are currently working on continued use of the technology and conducting optimization studies.


How has LIFT helped or how would you like LIFT to help your facility?

The legacy Water Environment & Reuse Foundation (WERF) has funded a fate and transport/removal study on trace organics. This study showed the removal efficiencies of each of the processes that were pilot tested and demonstrated that the majority of the trace organics were removed by BNR.

The technologies tested were:

  • BNR
  • Secondary Sedimentation (with launders covered and uncovered)
  • Filtration with pre-ozone
  • Filtration with no pre-ozone
  • Disinfection using chlorine, ozone, and UV

The wastewater treatment plant would like LIFT to help with future funding for studies on optimization and constituents of emerging concern.

If there is one technology you could pilot or collaborate on tomorrow, what would it be?

  • One thing that we just started pilot testing is primary sludge fermentation to create additional carbon for the BNR (the BNR is carbon limited).


Mitch Maidrand
Principal Civil Engineer
Sacramento Regional Wastewater Treatment Plant