AWWA REUSE52129

The Dublin San Ramon Services District (DSRSD) must export secondary effluentfrom its Regional Wastewater Treatment Facility in Pleasanton, California, viathe Livermore-Amador Valley Wastewater Management Agency (LAVWMA) pipeline to theSan Francisco Bay located 25 miles away. Due to increasing wastewater flows andcapacity constraints in the LAVWMA export pipeline, DSRSD implemented its CleanWater Revival project as a method of disposing a portion of its peak wet-weatherflows. The goal of the Clean Water Revival project is to produce recycled waterfor indirect potable reuse at their Regional Wastewater Treatment Facility. TheClean Water Revival project consists of the advanced treatment of municipalwastewater secondary effluent to produce a 2.5 million gallons per day (mgd)(2,800 acre-feet per year) demineralized recycled water source for potablegroundwater replenishment of a potable water supply. The $10 million advancedwater treatment (AWT) facility was commissioned in March 1999. The facility'sprocesses consist of a microfiltration and reverse osmosis integrated membranesystem, followed by ultraviolet light disinfection. The AWT processes aredesigned to achieve the minimum 5-log virus removal requirement for tertiarytreatment processes stated in the California Department of Health Services (DHS)"Draft Water Recycling Criteria" and to produce a high quality product water lowin turbidity, total dissolved solids, and total organic carbon. Although DHSrecommended approval of this project in July 1998, public opposition to theproject has prevented the District from being able to deliver water togroundwater injection wells. Part of the public's concerns have focused onwhether the product water is safe and whether the treatment processes cancontinually produce water that meets the regulatory requirements. The multiplebarrier design approach of the AWT, and the installation of continuous onlinemonitoring of various water quality constituents help to address these concerns.Verification of the AWT facility's water quality was also conducted during a16-week performance testing program immediately after the commissioning of thefacility. This paper discusses the design features of the AWT facility, includingreliability aspects of the installed equipment and water quality monitoringequipment and controls, and the performance of the facility to date. Includes 4 references, tables, figure.

Product Details

Edition:

Vol. - No.

Published:

01/01/2000

Number of Pages:

11

File Size:

1 file , 200 KB