Waste Water Treatment Biogas Projects

City of Santa Barbara WWTP

Project: 650 kW Biogas Renewable Cogen Plant for a Wastewater Treatment Plant

California Power Partners’ (Calpwr) build, own, and operate facility was constructed under a Power Purchase Agreement (PPA) with the City of Santa Barbara located at their El Estero WWTP site. The system uses the digester gas from the plant to fuel a 650 kW Guascor Lean Burn gas engine/generator system. The gas production from the digesters average 115-130 scfm (standard cubic ft/minute) and the hot water produced by the engines heat transfer system is used to maintain digester temperature. This reduces or eliminates the need for the facility to operate their natural gas fired boilers. Since start-up in December of 2013 this unmanned plant has realized 96% availability.

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City of Oceanside WWTP

Project: 1.5 MW Biogas Renewable Cogen Plant for a Wastewater Treatment Plant

California Power Partners’ (Calpwr) build, own, and operate facility was constructed under a Power Purchase Agreement (PPA) with the City of Oceanside located at their San Luis Rey WWTP site. The system uses the digester gas from the plant to fuel a 560 kW Guascor Lean Burn gas engine/generator system. The gas production from the digesters average 156 scfm (standard cubic ft/minute) and the hot water produced by the engines heat transfer system is used to heat the digesters. This reduces or eliminates the need for the facility to operate their natural gas fired boilers.

To protect the engine and plumbing from digester gas contaminants as well as meet the Air Permitting requirements, Calpwr, has provided the fuel conditioning system for the project. The Calpwr fuel treatment system addresses Siloxane, moisture removal and H2S removal. With this system in place H2S levels are reduced from 300 PPM to < 50 PPM. Relative humidity entering engine gas stream is reduced from 100% saturated to < 20% and Siloxane levels are non- detectable. The synergy of the fuel treatment plus engine/generator systems realized an emission output which exceeds all air permitting requirements without exhaust controls of any kind.

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Burlingame Wastewater Treatment Plant – Burlingame, CA

Project: 200 kW Digester Gas-Fired Cogen Plant for a Wastewater Treatment Plant

Equipment supply, engineering, turnkey installation, and maintenance of a 200 kW Caterpillar digester gas-fired cogen system for the WWTP. Heat from the cogen system is used to heat the digester tanks.

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Laguna Wastewater Treatment Plant – Laguna, CA

Project: 210 Kw Digester Gas-Fired Cogen Plant for a Wastewater Treatment Plant

Supply, Engineering, turnkey installation, and maintenance of a 210 kW (2 x 30 kW and 3 x 60 kW Capstone MicroTurbines) digester gas-fired cogen system for the WWTP.

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Note: For all projects, some or all of the renewable energy certificates may be sold to third parties.