Wastewater Reclamation and Reuse for Malibu, California

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by Harry Stone, Los Angeles County Dep of Public, Works, Alhambra, United States,
Anthony Bouchard, Los Angeles County Dep of Public, Works, Alhambra, United States,

Document Type: Proceeding Paper

Part of: Water Resources Planning and Management and Urban Water Resources:

Abstract: Engineering-Science is providing consulting engineering services for the design of a sewer system and wastewater reclamation plant for the urban portion of Malibu, California. This project is being administered by the Los Angeles County Department of Public Works for Water Works District Number 29. The system that is currently under design will incorporate a combination gravity collection system and a Septic Tank Effluent Pumping (STEP) collection system, and an advanced wastewater reclamation plant meeting all the requirements of the California Administrative Code Title 22 stipulations for reclaimed water use. The regional wastewater reclamation plant is designed for a 1.30 mgd average daily dry weather flow, and is capable of handling peak flows, plus the peak overflow from a small adjacent reclamation plant serving Pepperdine University. Very early in conceptual design, it was concluded that the plant would treat the collected residential and commercial sewage to levels acceptable for unrestricted discharge. Wastewater treated to this level is acceptable for reuse as spray irrigation, surface irrigation, landscape irrigation, nonrestricted recreational impoundment and disposal to shellfishing areas. The proposed use of this reclaimed water will encompass several scenarios. They will include a pilot constructed wetlands, transport of reclaimed water to an existing wastewater reclamation plant for joint reuse with its effluent, transport of reclaimed water to an existing reclaimed water system at Pepperdine University, irrigation water for the Hughes Research Center, and future connections to the Malibu Civic Center area. Additionally, a full capacity reclaimed water line will be constructed to Corral Canyon Creek as an interim and, ultimately, an emergency disposal location to allow discharge under seasonal water demand fluctuations. This line will also be capable of being extended to future reclaimed water users. The paper will discuss the effluent reuse and disposal option study, a discussion of the plant unit processes required to meet the discharge requirements of the viable reuse options, and finally, a brief discussion of the proposed reclaimed water uses.

Subject Headings: Water reclamation | Water treatment plants | Wastewater treatment plants | Water discharge | Surface irrigation | Effluents | Sewage | North America | California | United States

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