Western Riverside County Regional Wastewater Authority
Wastewater Treatment Plant Expansion
|
WRCRWA owns and operates a joint agency treatment facility near Corona, CA. AQUA Engineering, partnered with WEBB Associates, designed and assisted with construction services for this plant expansion from 8 MGD to 14 MGD. All plant components were addressed and improved as part of this upgrade, including the headworks, primary clarification, flow equalization, secondary treatment, tertiary filtration and disinfection, solids thickening, anaerobic digestion, solids dewatering, solids drying, and odor control. The plant capacity was increased while significantly reducing the power and operational costs associated with this facility. This facility loads automatically using screw conveyors and gates to deliver dewatered cake to each of the three drying beds. The Huber turner then turns, aerates, and assists in the drying process as the solids move through the solar drying beds. Finally discharge conveyors move the dried product to a truck loading facility where the solids are automatically loaded into trailers for hauling. This fully automated process reduces operator labor required for this process.
The solids process included the addition of solids thickening for both primary and secondary solids, two existing aerobic digesters were converted to anaerobic digesters, and boilers were added for heating the digesters and to provide heat to the new solar drying facility. The existing dewatering equipment was replaced with three (3) new centrifuges to improve dewatering of the digested solids and the solids are then automatically conveyed to a solar drying greenhouse, where they are further dried to 85% producing a Class A product. The Authority saves over $700,000 per year in hauling costs with this upgrade. Also, the plant’s solids hauling requirement is reduced by about 90% along with the associated disposal costs. |
Project Summary:
Client |
WRCRWA |
Reference |
*Available upon request |
Location |
Riverside, CA |
Size |
14 MGD | Conventional Activated Sludge |
Cost |
$40 Million |
Features |
|
