Las Virgenes Municipal Water District Tapia Water Reclamation Facility Blower and Aeration Equipment Improvements

Calabasas, CA


PACE has supported the Las Virgenes Municipal Water District (LVMWD) water and wastewater infrastructure and treatment initiatives for over 13 years.


Among this experience, PACE provided LVMWD with design and design support during construction for the Tapia Water Reclamation Facility (WRF) Process Air Improvement Project.  The Tapia WRF used (3) 900 HP, 4610V, Roots centrifugal blowers to provide air to their biological treatment process, as well as other ancillary processes. The District wanted to improve energy efficiency and reduce operational costs by implementing new blowers and aeration equipment. PACE evaluated the existing conditions, including the existing treatment process, blower performances, as-built drawings, etc., as well as spent time with the Operations Staff to better understand the challenges and identify the right solutions.   After the evaluation, PACE provided design upgrades to the process air system that included the installation of (3) new 400 HP, 480V Sulzer Magnetic Bearing Blowers; upgrades the aeration system to include the installation of over 60 retrievable, OTT fine bubble aeration grids ; and electrical gear conversion from 4160 medium voltage to 480 low voltage system.  A unique element of the project was the use of Performance-based Specifications developed by PACE to reduce the equipment capital cost of the project (i.e., blowers and fine bubble diffusers costs) by more than 30%.  It also included an O&M service contract that helps the District understands future O&M cost.  Since the project completion, the client realized an average energy saving of over 25%.


Key Features:

  • Existing facility upgrade of 12 MGD WRF
  • Energy rebate analysis
  • Maintained operations during construction
  • Saved $300,000 in capital cost using specialized Performance-Based Specifications process
  • Prepared O&M manuals
  • Secondary process evaluation with aeration blower equipment and aeration control upgrades

Las Virgenes Municipal Water District


APWA Best Project of the Year for Water/Wastewater / Drainage Category & ACEC Commendation Engineering Excellence Award

Wastewater Treatment