South Bay Desalting Project

San Diego County Water Authority, 

South Bay Desalting Project

Project Highlights: 
  • Feasibility study for co-siting a 30-mgd seawater desalting plant with an existing power plant.
  • Study and evaluation of various process and equipment options.
  • Desalting costs estimation.
San Diego RO Facility
Siting RO facilities near power plants can significantly improve the economic feasibility of seawater desalination plants.

Civil Engineering has made it possible to support a large population in the arid climate of Southern California. However, as the population continues to grow, the use of native and imported fresh water supplies have been maximized. With few alternatives for meeting future potable water demands available, civil engineers are looking to the sea to provide more drinking water to a thirsty land. Carollo Engineers was retained by the San Diego County Water Authority (SDCWA) to study the feasibility of constructing a 30-mgd seawater RO desalting plant in connection with the repowering of Generating Unit No. 3 at the South Bay Power Plant of San Diego Gas and Electric (SDG&E), to assist SDCWA with negotiation of electric power and steam pricing, and with equipment siting issues for this potential cogeneration project.

Carollo's responsibilities included:

  • Conceptual design of the RO plant and the feedwater pretreatment processes.
  • Conceptual layout of equipment and study of plant siting issues.
  • Study and evaluation of various process and equipment options.
  • Participation in meetings and workshops with SDCWA and SDG&E to define interface issues.
  • Estimate desalting costs.