Hydropower on a Wastewater Plant Outfall: Point Loma Hydro Project

by James D. Earles, CH2M Hill, Sacramento, CA, USA,
Larry C. Amans, CH2M Hill, Sacramento, CA, USA,
Donald G. Thomas, CH2M Hill, Sacramento, CA, USA,
Randy Weaver, CH2M Hill, Sacramento, CA, USA,

Document Type: Proceeding Paper

Part of: Waterpower '85


The plant is on a bluff 90 feet above the Pacific Ocean where the primary treated effluent is discharged through a 2-mile-long (3. 2 kilometer) outfall pipeline. The head was previously dissipated with a 54-inch butterfly throttling valve located at the toe of the bluff. A design challenge was to protect project components from the aggressive combination of salty sea air and hydrogen sulfide gas produced by the primary treated sewage effluent. The reinforced concrete powerhouse is located on a small 60 multiplied by 70-foot site. A vertical-shaft Francis turbine unit was installed in a 2-story, 25 multiplied by 35-foot powerhouse. Plant discharge is to a buried junction vault which also receives flows from the parallel bypass throttling valve.

Subject Headings: Hydro power | Wastewater management | Power plants | Wastewater treatment plants | Valves | Reinforced concrete | Turbines | Construction management | Pacific Ocean | Georgia | United States

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