Biosolids Digester Construction

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(Updated July 10, 2014) 

The contractor continues to install large mechanical equipment inside the pump station building (boiler, heat exchangers and mixing pumps). The contractor also completed the installation of large structural steel members, stairs and decking, roofing, stud walls and eaves for the building. Additionally, the raw sludge pipeline has been tied into the existing sludge feed and sludge gas systems. The construction work is on-schedule with a projected completion date in mid-August 2014.

Pump Station Building - interior

(Updated May 5, 2014)

The building that houses the pump station is well underway (click here to view the photos).  Crews are busy working on the interior and exterior of the new structure.

(Updated February 27, 2014)

The contractor has completed 100% of the 3rd Digester structure and  the underground piping as well as pressure/leak testing of the tank and piping installations.  Contractor has also backfilled around the digester and underground piping installation and has started construction of the foundation for the digester pump station building.


To see more construction photos, click here.


Daily Photo 172 - Completed




(Updated October 23, 2013)

Progress continues on the biosolids digester, with work now 90 percent complete. 

Click on this link to see the latest construction activity:  Biosolids Digester Construction - Photo Album.

(Updated August 2013)

Work has commenced on the construction of a new Biosolids Digester at the Rancho Las Virgenes Composting Facility site, where it will join two similar units that have been in use for more than 20 years.

The new unit will provide a needed addition in the capacity to handle biosolids with the added benefit of energy recovery systems being built into the unit.

A significant portion of the digester will be below the surrounding ground level, as the unit is very heavy and must have a firm foundation.

The new digester is a project of the Las Virgenes – Triunfo Joint Powers Authority that performs wastewater treatment, biosolids composting and recycled water distribution for regional customers.

 Biosolids Digester Construction - Photo Album - click here to see daily photos of the project.


Board members of the Las Virgenes – Triunfo Joint Powers Authority inspect progress on the Digester construction project as part of their meeting on August 5, 2013.