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Energy Management Strategies for Orange County Sanitation District (OCSD) Treatment Plants

This overview details the energy management framework at OCSD, encompassing two treatment plants located in Fountain Valley and Huntington Beach. Serving 2.5 million residents, OCSD faces various energy efficiency challenges while managing a peak demand of up to 17 MW. The report outlines strategies to optimize energy consumption, including advanced monitoring systems, participation in efficiency programs, and leveraging renewable energy sources, particularly from digester gas. The goal is to ensure sustainable energy usage while maintaining reliable wastewater treatment services.

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Energy Management Strategies for Orange County Sanitation District (OCSD) Treatment Plants

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  1. Energy Management Dave Halverson Orange County Sanitation District

  2. OCSD Overview • Two Treatment Plants – Fountain Valley and Huntington Beach • Serving north Orange County – 2.5 million people • Average influent is 240 MGD, 210 recently • Plant 1 provides about 80 MGD to the Ground Water Replenishment Program • Flow diverted from Plant 2 at night (20 MGD)

  3. Plant 1 Electrical System • Existing peak demand = 7 MW • 2014 estimated peak demand = 17 MW • Co-gen facility rated 5 MW • New 66kV substation – dual sourced • Standby generators for critical loads • ION 7550 power monitor based

  4. Plant 2 Electrical System • Existing peak demand = 7.5 MW • 2014 estimated peak demand = 7 MW • Co-gen facility rated 13 MW • 66kV substation – single sourced • Standby generators for critical loads • ION 2300 power monitor based

  5. Energy System Challenges • CenGen operation is limited by AQMD • Large capital expansion program pushes energy conservation projects out • Plant 2 energy efficiency will be challenged with a growing diurnal curve • Energy monitoring and control systems are too basic and high level • The 4.5 mile digester gas pipeline between the two treatment plants is out of service • Limited process storage capacity

  6. Energy Management Approach • Know the Energy Demands • Know What You Are Paying • Understand the Onsite Energy Generation • Build Efficiency Into New Projects • Communicate with Operations • Participate in Edison Efficiency Programs • Monitor Alternative Energy Technologies

  7. Know the Energy Demands • Central Generation Automation Project • Power SCADA system project at Plant 1 • Home grown SCADA project at Plant 2 • Annual est. of power used by each process

  8. Know What You Are Paying • Recording Bills in a Spreadsheet • Analyze for accuracy and trends • Credit for $25K in March • Learn the Tariffs • Peak hours/time of year • Meet with Utility Reps

  9. Understand the Onsite Energy Generation • Record Generation Metrics in Spreadsheet • Trend Fuel Use, Output, and Efficiencies • Identified Excessive Flaring of Digester Gas • Obtained AQMD Permit Change

  10. Build Efficiency Into New Projects • Premium efficiency motors • Use of variable speed motor controllers • High efficiency lamps and ballasts • Multi-level lighting

  11. Build Efficiency Into New Projects (cont.) • Optimize pumping applications to maximize efficiency • Challenge Process Designs • Oxygen Plant (Comp vs Membrane) • Primary Sludge Thickening

  12. Communicate with Operations • Know the Treatment Process • Challenge Operational Procedures • PEPS Pumps • Make Energy Info Available

  13. Participate in Edison Efficiency Programs • Savings by Design • Pump Testing and Optimization Program • Energy Conservation Review • BacGen

  14. Monitor Alternative Energy Technologies • Value of Digester Gas as Renewable Fuel • FOG Program • Solar • Fuel Cell

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