Headworks Project
On July 23, 2002 the City Council approved moving forward with implementation of the Oxnard Wastewater Treatment Plant (OWTP) Headworks Project. This project was conceived under the Asset Management Program, and is currently being implemented to meet the City’s wastewater collection needs correct existing system deficiences.
The OWTP Headworks Project will consist of a new headworks facility and new influent pump station which will be located on City property just north of the existing OWTP. The new headworks facility and influent pump station will be designed to meet the City’s ultimate average dry weather flow of 39.6 MGD (million gallons per day), and ultimate peak weather flow of 75.4 MGD.
Raw influent flows from the City’s collection system will be delivered to the Inlet Junction Structure. From there, the raw influent will be split among new influent channels, each containing a bar screen to remove solids. Screenings removed from the influent flow stream will be lifted by the bar screens and discharged to the conveyors. Each conveyor will discharge to the storage bin located in the Grit/Screenings Building. After passing through the bar screens, the influent flow stream will flow into grit chambers where grit particles will settle to the hoppers. Settled grit will be removed from the hoppers via grit pumps and pumped to the grit separators for dewatering. Dewatered grit will be discharged to the storage bin located in the Grit/Screenings Building. Dewatered grit will be transported to the landfill for disposal. The wastewater will then flow into the influent pump station wet well and be pumped, via influent pumps, to the OWTP for full secondary treatment.
The new Headworks Project will maintain the treatment plant capacity while substantially enhancing process reliability, performance, and operability. These improvements are attained by providing process and mechanical equipment redundancy throughout key elements of the new Headworks facility.