Silicon Valley Clean Water, Cogeneration, Gas Treatment System and Hot Water Loop Upgrades

Location: Redwood City, CA

Owner: Silicon Valley Clean Water

Contract: $10.2 Million

Role: General Contractor

Delivery Method: Design-Bid-Build

Result and Benefit to Client

All essential systems remained operational without interruptions during construction. The project was delivered on time and within budget with no safety issues.


Methane gas generated during sludge digestion process is captured and used as fuel to power engine-generators. These generators, in turn power the WWTP.

Project Description

As General Contractor, Monterey Mechanical self-performed 75% of the work for the SVCW cogeneration, gas treatment and hot water loop upgrades project.

The scope of work included:

  • Installation, start-up and testing of two 633kW cogeneration engines, support equipment and appurtenances including pumps, heat exchangers, radiators, exhaust equipment, fuel trains, heat recovery components, and lube oil systems.
  • A new gas conditioning system to remove hydrogen sulfide, siloxanes, and moisture from the digester gas.
  • A new heating and heat distribution system, new primary loop pumps, secondary loop equipment for the boiler, cogeneration, and sludge secondary loops to make use of the heat generated from the combustion engines.


Challenges | Solutions

It was important that essential systems remain operational throughout construction. These included the new heating and heat distribution equipment, the sludge transfer pumping systems, and the existing recirculation pumps.

Monterey Mechanical developed detailed sequencing and contingency plans to prevent interruptions.