As the Lead Partner in a joint venture with Webcor Builders, MWH Constructors was awarded a $939M contract by the San Francisco Public Utilities Commission (SFPUC) to serve as construction manager/general contractor for the seven-year Southeast Water Pollution Control Plant Biosolids Digester Facilities Project.

SFPUC is the third largest municipal utility in California and the Southeast Water Pollution Control Plant (SEP) is the SFPUC’s largest wastewater treatment facility, treating 80 percent of San Francisco’s sewage and storm water flows. The SEP Biosolids Digester Facilities Project (BDFP) is part of the SFPUC’s Sewer System Improvement Program, a 20-year, multi-billion-dollar citywide investment to upgrade aging sewer systems.

The BDFP aims to replace existing digester facilities with new, expanded, reliable, modernized and relocated facilities, as well as improve energy recovery and maximize control of odors.

Construction is expected to begin Winter 2018/2019.

  • MWH Constructors brings its global experience with the Thermal Hydrolysis Process (THP) to this project, which will enable the new facilities to produce higher quality biosolids, capture and treat odors more effectively, and maximize biogas utilization and energy recovery to produce heat, steam and energy.
  • The project will be constructed in two parts to allow for continued use of the facilities. Part one includes the demolition and site preparation of the eastern portion of the SEP and existing asphalt plant, and construction of the new facilities on the site.
  • Part two involves the demolition of the Central Shops and western portion of the SEP, with final completion of the new Biosolids Digester Facility following.